git.delta.rocks / unique-network / refs/commits / 4b0f7ea4ecce

--- a/.docker/Dockerfile-chain-dev-unit
+++ b/.docker/Dockerfile-chain-dev-unit
@@ -23,4 +23,4 @@
 
 WORKDIR /dev_chain
 
-CMD cargo test --features=limit-testing
+CMD cargo test --features=limit-testing --workspace

--- a/.github/workflows/ci-develop.yml
+++ b/.github/workflows/ci-develop.yml
@@ -3,7 +3,7 @@
 on:
   pull_request:
     branches: [ 'develop' ]
-    types: [ opened, reopened, synchronize, ready_for_review ]
+    types: [ opened, reopened, synchronize, ready_for_review, converted_to_draft ]
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref }}
@@ -12,23 +12,28 @@
 jobs:
 
   yarn-test-dev:
+    if: github.event.pull_request.draft == false
     uses: ./.github/workflows/dev-build-tests_v2.yml
 
+
   unit-test:
+    if: github.event.pull_request.draft == false
     uses: ./.github/workflows/unit-test_v2.yml
 
   canary:
-    if: ${{ contains( github.event.pull_request.labels.*.name, 'canary') }}
+    if: ${{ (github.event.pull_request.draft == false && contains( github.event.pull_request.labels.*.name, 'canary')) }}
     uses: ./.github/workflows/canary.yml
     secrets: inherit # pass all secrets
 
   xcm:
-    if: ${{ contains( github.event.pull_request.labels.*.name, 'xcm') }}
+    if: ${{ (github.event.pull_request.draft == false && contains( github.event.pull_request.labels.*.name, 'xcm')) }}
     uses: ./.github/workflows/xcm.yml
     secrets: inherit # pass all secrets
 
   codestyle:
+    if: github.event.pull_request.draft == false
     uses: ./.github/workflows/codestyle_v2.yml
   
   yarn_eslint:
+    if: github.event.pull_request.draft == false
     uses: ./.github/workflows/test_codestyle_v2.yml

--- a/pallets/common/src/erc.rs
+++ b/pallets/common/src/erc.rs
@@ -139,25 +139,26 @@
 		save(self)
 	}
 
-	/// Set the substrate sponsor of the collection.
-	///
-	/// @dev In order for sponsorship to work, it must be confirmed on behalf of the sponsor.
-	///
-	/// @param sponsor Substrate address of the sponsor from whose account funds will be debited for operations with the contract.
-	fn set_collection_sponsor_substrate(
-		&mut self,
-		caller: caller,
-		sponsor: uint256,
-	) -> Result<void> {
-		self.consume_store_reads_and_writes(1, 1)?;
+	// TODO: Temprorary off. Need refactor
+	// /// Set the substrate sponsor of the collection.
+	// ///
+	// /// @dev In order for sponsorship to work, it must be confirmed on behalf of the sponsor.
+	// ///
+	// /// @param sponsor Substrate address of the sponsor from whose account funds will be debited for operations with the contract.
+	// fn set_collection_sponsor_substrate(
+	// 	&mut self,
+	// 	caller: caller,
+	// 	sponsor: uint256,
+	// ) -> Result<void> {
+	// 	self.consume_store_reads_and_writes(1, 1)?;
 
-		check_is_owner_or_admin(caller, self)?;
+	// 	check_is_owner_or_admin(caller, self)?;
 
-		let sponsor = convert_uint256_to_cross_account::<T>(sponsor);
-		self.set_sponsor(sponsor.as_sub().clone())
-			.map_err(dispatch_to_evm::<T>)?;
-		save(self)
-	}
+	// 	let sponsor = convert_uint256_to_cross_account::<T>(sponsor);
+	// 	self.set_sponsor(sponsor.as_sub().clone())
+	// 		.map_err(dispatch_to_evm::<T>)?;
+	// 	save(self)
+	// }
 
 	/// Whether there is a pending sponsor.
 	fn has_collection_pending_sponsor(&self) -> Result<bool> {
@@ -299,35 +300,37 @@
 		Ok(crate::eth::collection_id_to_address(self.id))
 	}
 
-	/// Add collection admin by substrate address.
-	/// @param newAdmin Substrate administrator address.
-	fn add_collection_admin_substrate(
-		&mut self,
-		caller: caller,
-		new_admin: uint256,
-	) -> Result<void> {
-		self.consume_store_writes(2)?;
+	// TODO: Temprorary off. Need refactor
+	// /// Add collection admin by substrate address.
+	// /// @param newAdmin Substrate administrator address.
+	// fn add_collection_admin_substrate(
+	// 	&mut self,
+	// 	caller: caller,
+	// 	new_admin: uint256,
+	// ) -> Result<void> {
+	// 	self.consume_store_writes(2)?;
 
-		let caller = T::CrossAccountId::from_eth(caller);
-		let new_admin = convert_uint256_to_cross_account::<T>(new_admin);
-		<Pallet<T>>::toggle_admin(self, &caller, &new_admin, true).map_err(dispatch_to_evm::<T>)?;
-		Ok(())
-	}
+	// 	let caller = T::CrossAccountId::from_eth(caller);
+	// 	let new_admin = convert_uint256_to_cross_account::<T>(new_admin);
+	// 	<Pallet<T>>::toggle_admin(self, &caller, &new_admin, true).map_err(dispatch_to_evm::<T>)?;
+	// 	Ok(())
+	// }
 
-	/// Remove collection admin by substrate address.
-	/// @param admin Substrate administrator address.
-	fn remove_collection_admin_substrate(
-		&mut self,
-		caller: caller,
-		admin: uint256,
-	) -> Result<void> {
-		self.consume_store_writes(2)?;
+	// TODO: Temprorary off. Need refactor
+	// /// Remove collection admin by substrate address.
+	// /// @param admin Substrate administrator address.
+	// fn remove_collection_admin_substrate(
+	// 	&mut self,
+	// 	caller: caller,
+	// 	admin: uint256,
+	// ) -> Result<void> {
+	// 	self.consume_store_writes(2)?;
 
-		let caller = T::CrossAccountId::from_eth(caller);
-		let admin = convert_uint256_to_cross_account::<T>(admin);
-		<Pallet<T>>::toggle_admin(self, &caller, &admin, false).map_err(dispatch_to_evm::<T>)?;
-		Ok(())
-	}
+	// 	let caller = T::CrossAccountId::from_eth(caller);
+	// 	let admin = convert_uint256_to_cross_account::<T>(admin);
+	// 	<Pallet<T>>::toggle_admin(self, &caller, &admin, false).map_err(dispatch_to_evm::<T>)?;
+	// 	Ok(())
+	// }
 
 	/// Add collection admin.
 	/// @param newAdmin Address of the added administrator.
@@ -476,21 +479,22 @@
 		Ok(())
 	}
 
-	/// Add substrate user to allowed list.
-	///
-	/// @param user User substrate address.
-	fn add_to_collection_allow_list_substrate(
-		&mut self,
-		caller: caller,
-		user: uint256,
-	) -> Result<void> {
-		self.consume_store_writes(1)?;
+	// TODO: Temprorary off. Need refactor
+	// /// Add substrate user to allowed list.
+	// ///
+	// /// @param user User substrate address.
+	// fn add_to_collection_allow_list_substrate(
+	// 	&mut self,
+	// 	caller: caller,
+	// 	user: uint256,
+	// ) -> Result<void> {
+	// 	self.consume_store_writes(1)?;
 
-		let caller = T::CrossAccountId::from_eth(caller);
-		let user = convert_uint256_to_cross_account::<T>(user);
-		Pallet::<T>::toggle_allowlist(self, &caller, &user, true).map_err(dispatch_to_evm::<T>)?;
-		Ok(())
-	}
+	// 	let caller = T::CrossAccountId::from_eth(caller);
+	// 	let user = convert_uint256_to_cross_account::<T>(user);
+	// 	Pallet::<T>::toggle_allowlist(self, &caller, &user, true).map_err(dispatch_to_evm::<T>)?;
+	// 	Ok(())
+	// }
 
 	/// Remove the user from the allowed list.
 	///
@@ -504,21 +508,22 @@
 		Ok(())
 	}
 
-	/// Remove substrate user from allowed list.
-	///
-	/// @param user User substrate address.
-	fn remove_from_collection_allow_list_substrate(
-		&mut self,
-		caller: caller,
-		user: uint256,
-	) -> Result<void> {
-		self.consume_store_writes(1)?;
+	// TODO: Temprorary off. Need refactor
+	// /// Remove substrate user from allowed list.
+	// ///
+	// /// @param user User substrate address.
+	// fn remove_from_collection_allow_list_substrate(
+	// 	&mut self,
+	// 	caller: caller,
+	// 	user: uint256,
+	// ) -> Result<void> {
+	// 	self.consume_store_writes(1)?;
 
-		let caller = T::CrossAccountId::from_eth(caller);
-		let user = convert_uint256_to_cross_account::<T>(user);
-		Pallet::<T>::toggle_allowlist(self, &caller, &user, false).map_err(dispatch_to_evm::<T>)?;
-		Ok(())
-	}
+	// 	let caller = T::CrossAccountId::from_eth(caller);
+	// 	let user = convert_uint256_to_cross_account::<T>(user);
+	// 	Pallet::<T>::toggle_allowlist(self, &caller, &user, false).map_err(dispatch_to_evm::<T>)?;
+	// 	Ok(())
+	// }
 
 	/// Switch permission for minting.
 	///
@@ -551,14 +556,15 @@
 		Ok(self.is_owner_or_admin(&user))
 	}
 
-	/// Check that substrate account is the owner or admin of the collection
-	///
-	/// @param user account to verify
-	/// @return "true" if account is the owner or admin
-	fn is_owner_or_admin_substrate(&self, user: uint256) -> Result<bool> {
-		let user = convert_uint256_to_cross_account::<T>(user);
-		Ok(self.is_owner_or_admin(&user))
-	}
+	// TODO: Temprorary off. Need refactor
+	// /// Check that substrate account is the owner or admin of the collection
+	// ///
+	// /// @param user account to verify
+	// /// @return "true" if account is the owner or admin
+	// fn is_owner_or_admin_substrate(&self, user: uint256) -> Result<bool> {
+	// 	let user = convert_uint256_to_cross_account::<T>(user);
+	// 	Ok(self.is_owner_or_admin(&user))
+	// }
 
 	/// Returns collection type
 	///
@@ -595,18 +601,19 @@
 			.map_err(dispatch_to_evm::<T>)
 	}
 
-	/// Changes collection owner to another substrate account
-	///
-	/// @dev Owner can be changed only by current owner
-	/// @param newOwner new owner substrate account
-	fn set_owner_substrate(&mut self, caller: caller, new_owner: uint256) -> Result<void> {
-		self.consume_store_writes(1)?;
+	// TODO: Temprorary off. Need refactor
+	// /// Changes collection owner to another substrate account
+	// ///
+	// /// @dev Owner can be changed only by current owner
+	// /// @param newOwner new owner substrate account
+	// fn set_owner_substrate(&mut self, caller: caller, new_owner: uint256) -> Result<void> {
+	// 	self.consume_store_writes(1)?;
 
-		let caller = T::CrossAccountId::from_eth(caller);
-		let new_owner = convert_uint256_to_cross_account::<T>(new_owner);
-		self.set_owner_internal(caller, new_owner)
-			.map_err(dispatch_to_evm::<T>)
-	}
+	// 	let caller = T::CrossAccountId::from_eth(caller);
+	// 	let new_owner = convert_uint256_to_cross_account::<T>(new_owner);
+	// 	self.set_owner_internal(caller, new_owner)
+	// 		.map_err(dispatch_to_evm::<T>)
+	// }
 
 	// TODO: need implement AbiWriter for &Vec<T>
 	// fn collection_admins(&self) -> Result<Vec<(address, uint256)>> {

binary blob — no preview

--- a/pallets/fungible/src/stubs/UniqueFungible.sol
+++ b/pallets/fungible/src/stubs/UniqueFungible.sol
@@ -18,7 +18,7 @@
 }
 
 /// @title A contract that allows you to work with collections.
-/// @dev the ERC-165 identifier for this interface is 0x47dbc105
+/// @dev the ERC-165 identifier for this interface is 0x3e1e8083
 contract Collection is Dummy, ERC165 {
 	/// Set collection property.
 	///
@@ -72,19 +72,6 @@
 		dummy = 0;
 	}
 
-	/// Set the substrate sponsor of the collection.
-	///
-	/// @dev In order for sponsorship to work, it must be confirmed on behalf of the sponsor.
-	///
-	/// @param sponsor Substrate address of the sponsor from whose account funds will be debited for operations with the contract.
-	/// @dev EVM selector for this function is: 0xc74d6751,
-	///  or in textual repr: setCollectionSponsorSubstrate(uint256)
-	function setCollectionSponsorSubstrate(uint256 sponsor) public {
-		require(false, stub_error);
-		sponsor;
-		dummy = 0;
-	}
-
 	/// Whether there is a pending sponsor.
 	/// @dev EVM selector for this function is: 0x058ac185,
 	///  or in textual repr: hasCollectionPendingSponsor()
@@ -167,26 +154,6 @@
 		return 0x0000000000000000000000000000000000000000;
 	}
 
-	/// Add collection admin by substrate address.
-	/// @param newAdmin Substrate administrator address.
-	/// @dev EVM selector for this function is: 0x5730062b,
-	///  or in textual repr: addCollectionAdminSubstrate(uint256)
-	function addCollectionAdminSubstrate(uint256 newAdmin) public {
-		require(false, stub_error);
-		newAdmin;
-		dummy = 0;
-	}
-
-	/// Remove collection admin by substrate address.
-	/// @param admin Substrate administrator address.
-	/// @dev EVM selector for this function is: 0x4048fcf9,
-	///  or in textual repr: removeCollectionAdminSubstrate(uint256)
-	function removeCollectionAdminSubstrate(uint256 admin) public {
-		require(false, stub_error);
-		admin;
-		dummy = 0;
-	}
-
 	/// Add collection admin.
 	/// @param newAdmin Address of the added administrator.
 	/// @dev EVM selector for this function is: 0x92e462c7,
@@ -262,17 +229,6 @@
 	/// @dev EVM selector for this function is: 0x67844fe6,
 	///  or in textual repr: addToCollectionAllowList(address)
 	function addToCollectionAllowList(address user) public {
-		require(false, stub_error);
-		user;
-		dummy = 0;
-	}
-
-	/// Add substrate user to allowed list.
-	///
-	/// @param user User substrate address.
-	/// @dev EVM selector for this function is: 0xd06ad267,
-	///  or in textual repr: addToCollectionAllowListSubstrate(uint256)
-	function addToCollectionAllowListSubstrate(uint256 user) public {
 		require(false, stub_error);
 		user;
 		dummy = 0;
@@ -289,17 +245,6 @@
 		dummy = 0;
 	}
 
-	/// Remove substrate user from allowed list.
-	///
-	/// @param user User substrate address.
-	/// @dev EVM selector for this function is: 0xa31913ed,
-	///  or in textual repr: removeFromCollectionAllowListSubstrate(uint256)
-	function removeFromCollectionAllowListSubstrate(uint256 user) public {
-		require(false, stub_error);
-		user;
-		dummy = 0;
-	}
-
 	/// Switch permission for minting.
 	///
 	/// @param mode Enable if "true".
@@ -324,19 +269,6 @@
 		return false;
 	}
 
-	/// Check that substrate account is the owner or admin of the collection
-	///
-	/// @param user account to verify
-	/// @return "true" if account is the owner or admin
-	/// @dev EVM selector for this function is: 0x68910e00,
-	///  or in textual repr: isOwnerOrAdminSubstrate(uint256)
-	function isOwnerOrAdminSubstrate(uint256 user) public view returns (bool) {
-		require(false, stub_error);
-		user;
-		dummy;
-		return false;
-	}
-
 	/// Returns collection type
 	///
 	/// @return `Fungible` or `NFT` or `ReFungible`
@@ -367,18 +299,6 @@
 	/// @dev EVM selector for this function is: 0x13af4035,
 	///  or in textual repr: setOwner(address)
 	function setOwner(address newOwner) public {
-		require(false, stub_error);
-		newOwner;
-		dummy = 0;
-	}
-
-	/// Changes collection owner to another substrate account
-	///
-	/// @dev Owner can be changed only by current owner
-	/// @param newOwner new owner substrate account
-	/// @dev EVM selector for this function is: 0xb212138f,
-	///  or in textual repr: setOwnerSubstrate(uint256)
-	function setOwnerSubstrate(uint256 newOwner) public {
 		require(false, stub_error);
 		newOwner;
 		dummy = 0;

binary blob — no preview

--- a/pallets/nonfungible/src/stubs/UniqueNFT.sol
+++ b/pallets/nonfungible/src/stubs/UniqueNFT.sol
@@ -91,7 +91,7 @@
 }
 
 /// @title A contract that allows you to work with collections.
-/// @dev the ERC-165 identifier for this interface is 0x47dbc105
+/// @dev the ERC-165 identifier for this interface is 0x3e1e8083
 contract Collection is Dummy, ERC165 {
 	/// Set collection property.
 	///
@@ -145,19 +145,6 @@
 		dummy = 0;
 	}
 
-	/// Set the substrate sponsor of the collection.
-	///
-	/// @dev In order for sponsorship to work, it must be confirmed on behalf of the sponsor.
-	///
-	/// @param sponsor Substrate address of the sponsor from whose account funds will be debited for operations with the contract.
-	/// @dev EVM selector for this function is: 0xc74d6751,
-	///  or in textual repr: setCollectionSponsorSubstrate(uint256)
-	function setCollectionSponsorSubstrate(uint256 sponsor) public {
-		require(false, stub_error);
-		sponsor;
-		dummy = 0;
-	}
-
 	/// Whether there is a pending sponsor.
 	/// @dev EVM selector for this function is: 0x058ac185,
 	///  or in textual repr: hasCollectionPendingSponsor()
@@ -240,26 +227,6 @@
 		return 0x0000000000000000000000000000000000000000;
 	}
 
-	/// Add collection admin by substrate address.
-	/// @param newAdmin Substrate administrator address.
-	/// @dev EVM selector for this function is: 0x5730062b,
-	///  or in textual repr: addCollectionAdminSubstrate(uint256)
-	function addCollectionAdminSubstrate(uint256 newAdmin) public {
-		require(false, stub_error);
-		newAdmin;
-		dummy = 0;
-	}
-
-	/// Remove collection admin by substrate address.
-	/// @param admin Substrate administrator address.
-	/// @dev EVM selector for this function is: 0x4048fcf9,
-	///  or in textual repr: removeCollectionAdminSubstrate(uint256)
-	function removeCollectionAdminSubstrate(uint256 admin) public {
-		require(false, stub_error);
-		admin;
-		dummy = 0;
-	}
-
 	/// Add collection admin.
 	/// @param newAdmin Address of the added administrator.
 	/// @dev EVM selector for this function is: 0x92e462c7,
@@ -335,17 +302,6 @@
 	/// @dev EVM selector for this function is: 0x67844fe6,
 	///  or in textual repr: addToCollectionAllowList(address)
 	function addToCollectionAllowList(address user) public {
-		require(false, stub_error);
-		user;
-		dummy = 0;
-	}
-
-	/// Add substrate user to allowed list.
-	///
-	/// @param user User substrate address.
-	/// @dev EVM selector for this function is: 0xd06ad267,
-	///  or in textual repr: addToCollectionAllowListSubstrate(uint256)
-	function addToCollectionAllowListSubstrate(uint256 user) public {
 		require(false, stub_error);
 		user;
 		dummy = 0;
@@ -362,17 +318,6 @@
 		dummy = 0;
 	}
 
-	/// Remove substrate user from allowed list.
-	///
-	/// @param user User substrate address.
-	/// @dev EVM selector for this function is: 0xa31913ed,
-	///  or in textual repr: removeFromCollectionAllowListSubstrate(uint256)
-	function removeFromCollectionAllowListSubstrate(uint256 user) public {
-		require(false, stub_error);
-		user;
-		dummy = 0;
-	}
-
 	/// Switch permission for minting.
 	///
 	/// @param mode Enable if "true".
@@ -397,19 +342,6 @@
 		return false;
 	}
 
-	/// Check that substrate account is the owner or admin of the collection
-	///
-	/// @param user account to verify
-	/// @return "true" if account is the owner or admin
-	/// @dev EVM selector for this function is: 0x68910e00,
-	///  or in textual repr: isOwnerOrAdminSubstrate(uint256)
-	function isOwnerOrAdminSubstrate(uint256 user) public view returns (bool) {
-		require(false, stub_error);
-		user;
-		dummy;
-		return false;
-	}
-
 	/// Returns collection type
 	///
 	/// @return `Fungible` or `NFT` or `ReFungible`
@@ -440,18 +372,6 @@
 	/// @dev EVM selector for this function is: 0x13af4035,
 	///  or in textual repr: setOwner(address)
 	function setOwner(address newOwner) public {
-		require(false, stub_error);
-		newOwner;
-		dummy = 0;
-	}
-
-	/// Changes collection owner to another substrate account
-	///
-	/// @dev Owner can be changed only by current owner
-	/// @param newOwner new owner substrate account
-	/// @dev EVM selector for this function is: 0xb212138f,
-	///  or in textual repr: setOwnerSubstrate(uint256)
-	function setOwnerSubstrate(uint256 newOwner) public {
 		require(false, stub_error);
 		newOwner;
 		dummy = 0;

binary blob — no preview

--- a/pallets/refungible/src/stubs/UniqueRefungible.sol
+++ b/pallets/refungible/src/stubs/UniqueRefungible.sol
@@ -91,7 +91,7 @@
 }
 
 /// @title A contract that allows you to work with collections.
-/// @dev the ERC-165 identifier for this interface is 0x47dbc105
+/// @dev the ERC-165 identifier for this interface is 0x3e1e8083
 contract Collection is Dummy, ERC165 {
 	/// Set collection property.
 	///
@@ -145,19 +145,6 @@
 		dummy = 0;
 	}
 
-	/// Set the substrate sponsor of the collection.
-	///
-	/// @dev In order for sponsorship to work, it must be confirmed on behalf of the sponsor.
-	///
-	/// @param sponsor Substrate address of the sponsor from whose account funds will be debited for operations with the contract.
-	/// @dev EVM selector for this function is: 0xc74d6751,
-	///  or in textual repr: setCollectionSponsorSubstrate(uint256)
-	function setCollectionSponsorSubstrate(uint256 sponsor) public {
-		require(false, stub_error);
-		sponsor;
-		dummy = 0;
-	}
-
 	/// Whether there is a pending sponsor.
 	/// @dev EVM selector for this function is: 0x058ac185,
 	///  or in textual repr: hasCollectionPendingSponsor()
@@ -240,26 +227,6 @@
 		return 0x0000000000000000000000000000000000000000;
 	}
 
-	/// Add collection admin by substrate address.
-	/// @param newAdmin Substrate administrator address.
-	/// @dev EVM selector for this function is: 0x5730062b,
-	///  or in textual repr: addCollectionAdminSubstrate(uint256)
-	function addCollectionAdminSubstrate(uint256 newAdmin) public {
-		require(false, stub_error);
-		newAdmin;
-		dummy = 0;
-	}
-
-	/// Remove collection admin by substrate address.
-	/// @param admin Substrate administrator address.
-	/// @dev EVM selector for this function is: 0x4048fcf9,
-	///  or in textual repr: removeCollectionAdminSubstrate(uint256)
-	function removeCollectionAdminSubstrate(uint256 admin) public {
-		require(false, stub_error);
-		admin;
-		dummy = 0;
-	}
-
 	/// Add collection admin.
 	/// @param newAdmin Address of the added administrator.
 	/// @dev EVM selector for this function is: 0x92e462c7,
@@ -335,17 +302,6 @@
 	/// @dev EVM selector for this function is: 0x67844fe6,
 	///  or in textual repr: addToCollectionAllowList(address)
 	function addToCollectionAllowList(address user) public {
-		require(false, stub_error);
-		user;
-		dummy = 0;
-	}
-
-	/// Add substrate user to allowed list.
-	///
-	/// @param user User substrate address.
-	/// @dev EVM selector for this function is: 0xd06ad267,
-	///  or in textual repr: addToCollectionAllowListSubstrate(uint256)
-	function addToCollectionAllowListSubstrate(uint256 user) public {
 		require(false, stub_error);
 		user;
 		dummy = 0;
@@ -362,17 +318,6 @@
 		dummy = 0;
 	}
 
-	/// Remove substrate user from allowed list.
-	///
-	/// @param user User substrate address.
-	/// @dev EVM selector for this function is: 0xa31913ed,
-	///  or in textual repr: removeFromCollectionAllowListSubstrate(uint256)
-	function removeFromCollectionAllowListSubstrate(uint256 user) public {
-		require(false, stub_error);
-		user;
-		dummy = 0;
-	}
-
 	/// Switch permission for minting.
 	///
 	/// @param mode Enable if "true".
@@ -397,19 +342,6 @@
 		return false;
 	}
 
-	/// Check that substrate account is the owner or admin of the collection
-	///
-	/// @param user account to verify
-	/// @return "true" if account is the owner or admin
-	/// @dev EVM selector for this function is: 0x68910e00,
-	///  or in textual repr: isOwnerOrAdminSubstrate(uint256)
-	function isOwnerOrAdminSubstrate(uint256 user) public view returns (bool) {
-		require(false, stub_error);
-		user;
-		dummy;
-		return false;
-	}
-
 	/// Returns collection type
 	///
 	/// @return `Fungible` or `NFT` or `ReFungible`
@@ -440,18 +372,6 @@
 	/// @dev EVM selector for this function is: 0x13af4035,
 	///  or in textual repr: setOwner(address)
 	function setOwner(address newOwner) public {
-		require(false, stub_error);
-		newOwner;
-		dummy = 0;
-	}
-
-	/// Changes collection owner to another substrate account
-	///
-	/// @dev Owner can be changed only by current owner
-	/// @param newOwner new owner substrate account
-	/// @dev EVM selector for this function is: 0xb212138f,
-	///  or in textual repr: setOwnerSubstrate(uint256)
-	function setOwnerSubstrate(uint256 newOwner) public {
 		require(false, stub_error);
 		newOwner;
 		dummy = 0;

--- a/tests/package.json
+++ b/tests/package.json
@@ -88,8 +88,11 @@
     "testLimits": "mocha --timeout 9999999 -r ts-node/register ./**/limits.test.ts",
     "testEthCreateNFTCollection": "mocha --timeout 9999999 -r ts-node/register ./**/eth/createNFTCollection.test.ts",
     "testEthCreateRFTCollection": "mocha --timeout 9999999 -r ts-node/register ./**/eth/createRFTCollection.test.ts",
+    "testEthNFT": "mocha --timeout 9999999 -r ts-node/register ./**/eth/nonFungible.test.ts",
     "testRFT": "mocha --timeout 9999999 -r ts-node/register ./**/refungible.test.ts",
+    "testEthRFT": "mocha --timeout 9999999 -r ts-node/register ./**/eth/reFungible.test.ts ./**/eth/reFungibleToken.test.ts",
     "testFT": "mocha --timeout 9999999 -r ts-node/register ./**/fungible.test.ts",
+    "testEthFT": "mocha --timeout 9999999 -r ts-node/register ./**/eth/fungible.test.ts",
     "testRPC": "mocha --timeout 9999999 -r ts-node/register ./**/rpc.test.ts",
     "testPromotion": "mocha --timeout 9999999 -r ts-node/register ./**/app-promotion.test.ts",
     "polkadot-types-fetch-metadata": "curl -H 'Content-Type: application/json' -d '{\"id\":\"1\", \"jsonrpc\":\"2.0\", \"method\": \"state_getMetadata\", \"params\":[]}' http://localhost:9933 > src/interfaces/metadata.json",

--- a/tests/src/change-collection-owner.test.ts
+++ b/tests/src/change-collection-owner.test.ts
@@ -31,11 +31,11 @@
   itSub('Changing owner changes owner address', async ({helper}) => {
     const collection = await helper.nft.mintCollection(alice, {name: 'col', description: 'descr', tokenPrefix: 'COL'});
     const beforeChanging = await helper.collection.getData(collection.collectionId);
-    expect(beforeChanging?.normalizedOwner).to.be.equal(helper.util.normalizeSubstrateAddress(alice.address));
+    expect(beforeChanging?.normalizedOwner).to.be.equal(helper.address.normalizeSubstrate(alice.address));
 
     await collection.changeOwner(alice, bob.address);
     const afterChanging = await helper.collection.getData(collection.collectionId);
-    expect(afterChanging?.normalizedOwner).to.be.equal(helper.util.normalizeSubstrateAddress(bob.address));
+    expect(afterChanging?.normalizedOwner).to.be.equal(helper.address.normalizeSubstrate(bob.address));
   });
 });
 
@@ -60,7 +60,7 @@
     await expect(changeOwnerTx()).to.be.rejectedWith(/common\.NoPermission/);
 
     const afterChanging = await helper.collection.getData(collection.collectionId);
-    expect(afterChanging?.normalizedOwner).to.be.equal(helper.util.normalizeSubstrateAddress(bob.address));
+    expect(afterChanging?.normalizedOwner).to.be.equal(helper.address.normalizeSubstrate(bob.address));
   });
 
   itSub('New collectionOwner has access to sponsorship management operations in the collection', async ({helper}) => {
@@ -68,7 +68,7 @@
     await collection.changeOwner(alice, bob.address);
 
     const afterChanging = await helper.collection.getData(collection.collectionId);
-    expect(afterChanging?.normalizedOwner).to.be.equal(helper.util.normalizeSubstrateAddress(bob.address));
+    expect(afterChanging?.normalizedOwner).to.be.equal(helper.address.normalizeSubstrate(bob.address));
 
     await collection.setSponsor(bob, charlie.address);
     await collection.confirmSponsorship(charlie);
@@ -97,7 +97,7 @@
     await collection.changeOwner(alice, bob.address);
     await collection.changeOwner(bob, charlie.address);
     const collectionData = await collection.getData();
-    expect(collectionData?.normalizedOwner).to.be.equal(helper.util.normalizeSubstrateAddress(charlie.address));
+    expect(collectionData?.normalizedOwner).to.be.equal(helper.address.normalizeSubstrate(charlie.address));
   });
 });
 
@@ -140,7 +140,7 @@
     await expect(changeOwnerTx()).to.be.rejectedWith(/common\.NoPermission/);
 
     const afterChanging = await helper.collection.getData(collection.collectionId);
-    expect(afterChanging?.normalizedOwner).to.be.equal(helper.util.normalizeSubstrateAddress(bob.address));
+    expect(afterChanging?.normalizedOwner).to.be.equal(helper.address.normalizeSubstrate(bob.address));
 
     const setSponsorTx = async () => collection.setSponsor(alice, charlie.address);
     const confirmSponsorshipTx = async () => collection.confirmSponsorship(alice);

--- a/tests/src/createCollection.test.ts
+++ b/tests/src/createCollection.test.ts
@@ -14,12 +14,12 @@
 // You should have received a copy of the GNU General Public License
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
+import {IKeyringPair} from '@polkadot/types/types';
 import {usingPlaygrounds, expect, itSub, Pallets} from './util/playgrounds';
-import {IKeyringPair} from '@polkadot/types/types';
 import {ICollectionCreationOptions, IProperty} from './util/playgrounds/types';
-import {DevUniqueHelper} from './util/playgrounds/unique.dev';
+import {UniqueHelper} from './util/playgrounds/unique';
 
-async function mintCollectionHelper(helper: DevUniqueHelper, signer: IKeyringPair, options: ICollectionCreationOptions, type?: 'nft' | 'fungible' | 'refungible') {
+async function mintCollectionHelper(helper: UniqueHelper, signer: IKeyringPair, options: ICollectionCreationOptions, type?: 'nft' | 'fungible' | 'refungible') {
   let collection;
   if (type === 'nft') {
     collection = await helper.nft.mintCollection(signer, options);
@@ -29,7 +29,7 @@
     collection = await helper.rft.mintCollection(signer, options);
   }
   const data = await collection.getData();
-  expect(data?.normalizedOwner).to.be.equal(helper.util.normalizeSubstrateAddress(signer.address));
+  expect(data?.normalizedOwner).to.be.equal(helper.address.normalizeSubstrate(signer.address));
   expect(data?.name).to.be.equal(options.name);
   expect(data?.description).to.be.equal(options.description);
   expect(data?.raw.tokenPrefix).to.be.equal(options.tokenPrefix);
@@ -54,32 +54,27 @@
     });
   });
   itSub('Create new NFT collection', async ({helper}) => {
-
     await mintCollectionHelper(helper, alice, {name: 'col', description: 'descr', tokenPrefix: 'COL'}, 'nft');
   });
   itSub('Create new NFT collection whith collection_name of maximum length (64 bytes)', async ({helper}) => {
-
     await mintCollectionHelper(helper, alice, {name: 'A'.repeat(64), description: 'descr', tokenPrefix: 'COL'}, 'nft');
   });
   itSub('Create new NFT collection whith collection_description of maximum length (256 bytes)', async ({helper}) => {
-
     await mintCollectionHelper(helper, alice, {name: 'name', description: 'A'.repeat(256), tokenPrefix: 'COL'}, 'nft');
   });
   itSub('Create new NFT collection whith token_prefix of maximum length (16 bytes)', async ({helper}) => {
-
     await mintCollectionHelper(helper, alice, {name: 'name', description: 'descr', tokenPrefix: 'A'.repeat(16)}, 'nft');
   });
+
   itSub('Create new Fungible collection', async ({helper}) => {
-
     await mintCollectionHelper(helper, alice, {name: 'name', description: 'descr', tokenPrefix: 'COL'}, 'fungible');
   });
+
   itSub.ifWithPallets('Create new ReFungible collection', [Pallets.ReFungible], async ({helper}) => {
-
     await mintCollectionHelper(helper, alice, {name: 'name', description: 'descr', tokenPrefix: 'COL'}, 'refungible');
   });
 
   itSub('create new collection with properties', async ({helper}) => {
-
     await mintCollectionHelper(helper, alice, {
       name: 'name', description: 'descr', tokenPrefix: 'COL',
       properties: [{key: 'key1', value: 'val1'}],
@@ -88,7 +83,6 @@
   });
 
   itSub('Create new collection with extra fields', async ({helper}) => {
-
     const collection = await mintCollectionHelper(helper, alice, {name: 'name', description: 'descr', tokenPrefix: 'COL'}, 'fungible');
     await collection.setPermissions(alice, {access: 'AllowList'});
     await collection.setLimits(alice, {accountTokenOwnershipLimit: 3});
@@ -96,7 +90,7 @@
     const limits = await collection.getEffectiveLimits();
     const raw = data?.raw;
 
-    expect(data?.normalizedOwner).to.be.equal(helper.util.normalizeSubstrateAddress(alice.address));
+    expect(data?.normalizedOwner).to.be.equal(helper.address.normalizeSubstrate(alice.address));
     expect(data?.name).to.be.equal('name');
     expect(data?.description).to.be.equal('descr');
     expect(raw.permissions.access).to.be.equal('AllowList');
@@ -105,7 +99,6 @@
   });
 
   itSub('New collection is not external', async ({helper}) => {
-
     const collection = await helper.nft.mintCollection(alice, {name: 'name', description: 'descr', tokenPrefix: 'COL'});
     const data = await collection.getData();
     expect(data?.raw.readOnly).to.be.false;
@@ -131,12 +124,11 @@
     await expect(mintCollectionTx()).to.be.rejectedWith('Verification Error');
   });
   itSub('(!negative test!) create new NFT collection whith incorrect data (token_prefix)', async ({helper}) => {
-
     const mintCollectionTx = async () => helper.nft.mintCollection(alice, {name: 'name', description: 'descr', tokenPrefix: 'A'.repeat(17)});
     await expect(mintCollectionTx()).to.be.rejectedWith('Verification Error');
   });
+  
   itSub('(!negative test!) fails when bad limits are set', async ({helper}) => {
-
     const mintCollectionTx = async () => helper.nft.mintCollection(alice, {name: 'name', description: 'descr', tokenPrefix: 'COL', limits: {tokenLimit: 0}});
     await expect(mintCollectionTx()).to.be.rejectedWith(/common\.CollectionTokenLimitExceeded/);
   });

--- a/tests/src/createItem.test.ts
+++ b/tests/src/createItem.test.ts
@@ -15,24 +15,14 @@
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
 import {IKeyringPair} from '@polkadot/types/types';
-
-import {
-  createCollection,
-  itApi,
-  normalizeAccountId,
-  getCreateItemResult,
-  CrossAccountId,
-} from './util/helpers';
-
 import {usingPlaygrounds, expect, itSub, Pallets} from './util/playgrounds';
-import {IProperty} from './util/playgrounds/types';
-import {executeTransaction} from './substrate/substrate-api';
-import {DevUniqueHelper} from './util/playgrounds/unique.dev';
+import {IProperty, ICrossAccountId} from './util/playgrounds/types';
+import {UniqueHelper} from './util/playgrounds/unique';
 
-async function mintTokenHelper(helper: DevUniqueHelper, collection: any, signer: IKeyringPair, owner: CrossAccountId, type: 'nft' | 'fungible' | 'refungible'='nft', properties?: IProperty[]) {
+async function mintTokenHelper(helper: UniqueHelper, collection: any, signer: IKeyringPair, owner: ICrossAccountId, type: 'nft' | 'fungible' | 'refungible'='nft', properties?: IProperty[]) {
   let token;
   const itemCountBefore = await helper.collection.getLastTokenId(collection.collectionId);
-  const itemBalanceBefore = (await helper.api!.rpc.unique.balance(collection.collectionId, owner, 0)).toBigInt();
+  const itemBalanceBefore = (await helper.callRpc('api.rpc.unique.balance', [collection.collectionId, owner, 0])).toBigInt();
   if (type === 'nft') {
     token = await collection.mintToken(signer, owner, properties);
   } else if (type === 'fungible') {
@@ -42,7 +32,7 @@
   }
 
   const itemCountAfter = await helper.collection.getLastTokenId(collection.collectionId);
-  const itemBalanceAfter = (await helper.api!.rpc.unique.balance(collection.collectionId, owner, 0)).toBigInt();
+  const itemBalanceAfter = (await helper.callRpc('api.rpc.unique.balance', [collection.collectionId, owner, 0])).toBigInt();
 
   if (type === 'fungible') {
     expect(itemBalanceAfter - itemBalanceBefore).to.be.equal(10n);
@@ -75,27 +65,22 @@
   });
   itSub('Check events on create new item in Fungible collection', async ({helper}) => {
     const {collectionId} = await helper.ft.mintCollection(alice, {name: 'test', description: 'test', tokenPrefix: 'test'}, 0);
-    const api = helper.api!;
-
-
-    const to = normalizeAccountId(alice);
+    const to = {Substrate: alice.address};
     {
       const createData = {fungible: {value: 100}};
-      const tx = api.tx.unique.createItem(collectionId, to, createData as any);
-      const events = await executeTransaction(api, alice, tx);
-      const result = getCreateItemResult(events);
-      expect(result.amount).to.be.equal(100);
-      expect(result.collectionId).to.be.equal(collectionId);
-      expect(result.recipient).to.be.deep.equal(to);
+      const events = await helper.executeExtrinsic(alice, 'api.tx.unique.createItem', [collectionId, to, createData as any]);
+      const result = helper.util.extractTokensFromCreationResult(events);
+      expect(result.tokens[0].amount).to.be.equal(100n);
+      expect(result.tokens[0].collectionId).to.be.equal(collectionId);
+      expect(result.tokens[0].owner).to.be.deep.equal(to);
     }
     {
       const createData = {fungible: {value: 50}};
-      const tx = api.tx.unique.createItem(collectionId, to, createData as any);
-      const events = await executeTransaction(api, alice, tx);
-      const result = getCreateItemResult(events);
-      expect(result.amount).to.be.equal(50);
-      expect(result.collectionId).to.be.equal(collectionId);
-      expect(result.recipient).to.be.deep.equal(to);
+      const events = await helper.executeExtrinsic(alice, 'api.tx.unique.createItem', [collectionId, to, createData as any]);
+      const result = helper.util.extractTokensFromCreationResult(events);
+      expect(result.tokens[0].amount).to.be.equal(50n);
+      expect(result.tokens[0].collectionId).to.be.equal(collectionId);
+      expect(result.tokens[0].owner).to.be.deep.equal(to);
     }
   });
   itSub.ifWithPallets('Create new item in ReFungible collection', [Pallets.ReFungible], async ({helper}) =>  {
@@ -162,12 +147,12 @@
     const amount = 1n;
     const token = await mintTokenHelper(helper, collection, alice, {Substrate: bob.address});
     {
-      const totalPieces = await helper.api?.rpc.unique.totalPieces(collection.collectionId, token.tokenId);
+      const totalPieces = await helper.callRpc('api.rpc.unique.totalPieces', [collection.collectionId, token.tokenId]);
       expect(totalPieces?.unwrap().toBigInt()).to.be.equal(amount);
     }
     await token.transfer(bob, {Substrate: alice.address});
     {
-      const totalPieces = await helper.api?.rpc.unique.totalPieces(collection.collectionId, token.tokenId);
+      const totalPieces = await helper.callRpc('api.rpc.unique.totalPieces', [collection.collectionId, token.tokenId]);
       expect(totalPieces?.unwrap().toBigInt()).to.be.equal(amount);
     }
   });
@@ -267,21 +252,21 @@
   itSub('Check total pieces for invalid Fungible token', async ({helper}) => {
     const collection = await helper.ft.mintCollection(alice, {name: 'col', description: 'descr', tokenPrefix: 'COL'}, 0);
     const invalidTokenId = 1_000_000;
-    expect((await helper.api?.rpc.unique.totalPieces(collection.collectionId, invalidTokenId))?.isNone).to.be.true;
-    expect((await helper.api?.rpc.unique.tokenData(collection.collectionId, invalidTokenId))?.pieces.toBigInt()).to.be.equal(0n);
+    expect((await helper.callRpc('api.rpc.unique.totalPieces', [collection.collectionId, invalidTokenId]))?.isNone).to.be.true;
+    expect((await helper.callRpc('api.rpc.unique.tokenData', [collection.collectionId, invalidTokenId]))?.pieces.toBigInt()).to.be.equal(0n);
   });
 
   itSub('Check total pieces for invalid NFT token', async ({helper}) => {
     const collection = await helper.nft.mintCollection(alice, {name: 'col', description: 'descr', tokenPrefix: 'COL'});
     const invalidTokenId = 1_000_000;
-    expect((await helper.api?.rpc.unique.totalPieces(collection.collectionId, invalidTokenId))?.isNone).to.be.true;
-    expect((await helper.api?.rpc.unique.tokenData(collection.collectionId, invalidTokenId))?.pieces.toBigInt()).to.be.equal(0n);
+    expect((await helper.callRpc('api.rpc.unique.totalPieces', [collection.collectionId, invalidTokenId]))?.isNone).to.be.true;
+    expect((await helper.callRpc('api.rpc.unique.tokenData', [collection.collectionId, invalidTokenId]))?.pieces.toBigInt()).to.be.equal(0n);
   });
 
   itSub.ifWithPallets('Check total pieces for invalid Refungible token', [Pallets.ReFungible], async ({helper}) => {
     const collection = await helper.rft.mintCollection(alice, {name: 'col', description: 'descr', tokenPrefix: 'COL'});
     const invalidTokenId = 1_000_000;
-    expect((await helper.api?.rpc.unique.totalPieces(collection.collectionId, invalidTokenId))?.isNone).to.be.true;
-    expect((await helper.api?.rpc.unique.tokenData(collection.collectionId, invalidTokenId))?.pieces.toBigInt()).to.be.equal(0n);
+    expect((await helper.callRpc('api.rpc.unique.totalPieces', [collection.collectionId, invalidTokenId]))?.isNone).to.be.true;
+    expect((await helper.callRpc('api.rpc.unique.tokenData', [collection.collectionId, invalidTokenId]))?.pieces.toBigInt()).to.be.equal(0n);
   });
 });

--- a/tests/src/createMultipleItems.test.ts
+++ b/tests/src/createMultipleItems.test.ts
@@ -15,12 +15,8 @@
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
 import {IKeyringPair} from '@polkadot/types/types';
-import {
-  normalizeAccountId,
-} from './util/helpers';
 import {usingPlaygrounds, expect, Pallets, itSub} from './util/playgrounds';
 
-
 describe('Integration Test createMultipleItems(collection_id, owner, items_data):', () => {
   let alice: IKeyringPair;
 
@@ -48,7 +44,7 @@
     const tokens = await helper.nft.mintMultipleTokensWithOneOwner(alice, collection.collectionId, {Substrate: alice.address}, args);
     for (const [i, token] of tokens.entries()) {
       const tokenData = await token.getData();
-      expect(tokenData?.normalizedOwner).to.be.deep.equal({Substrate: helper.util.normalizeSubstrateAddress(alice.address)});
+      expect(tokenData?.normalizedOwner.Substrate).to.be.deep.equal(helper.address.normalizeSubstrate(alice.address));
       expect(tokenData?.properties[0].value).to.be.equal(args[i].properties[0].value);
     }
   });
@@ -116,7 +112,7 @@
     const tokens = await helper.nft.mintMultipleTokensWithOneOwner(alice, collection.collectionId, {Substrate: alice.address}, args);
     for (const [i, token] of tokens.entries()) {
       const tokenData = await token.getData();
-      expect(tokenData?.normalizedOwner).to.be.deep.equal({Substrate: helper.util.normalizeSubstrateAddress(alice.address)});
+      expect(tokenData?.normalizedOwner.Substrate).to.be.deep.equal(helper.address.normalizeSubstrate(alice.address));
       expect(tokenData?.properties[0].value).to.be.equal(args[i].properties[0].value);
     }
   });
@@ -138,7 +134,7 @@
     const tokens = await helper.nft.mintMultipleTokensWithOneOwner(alice, collection.collectionId, {Substrate: alice.address}, args);
     for (const [i, token] of tokens.entries()) {
       const tokenData = await token.getData();
-      expect(tokenData?.normalizedOwner).to.be.deep.equal({Substrate: helper.util.normalizeSubstrateAddress(alice.address)});
+      expect(tokenData?.normalizedOwner.Substrate).to.be.deep.equal(helper.address.normalizeSubstrate(alice.address));
       expect(tokenData?.properties[0].value).to.be.equal(args[i].properties[0].value);
     }
   });
@@ -160,7 +156,7 @@
     const tokens = await helper.nft.mintMultipleTokensWithOneOwner(alice, collection.collectionId, {Substrate: alice.address}, args);
     for (const [i, token] of tokens.entries()) {
       const tokenData = await token.getData();
-      expect(tokenData?.normalizedOwner).to.be.deep.equal({Substrate: helper.util.normalizeSubstrateAddress(alice.address)});
+      expect(tokenData?.normalizedOwner.Substrate).to.be.equal(helper.address.normalizeSubstrate(alice.address));
       expect(tokenData?.properties[0].value).to.be.equal(args[i].properties[0].value);
     }
   });
@@ -275,8 +271,11 @@
     });
 
     const types = ['NFT', 'Fungible', 'ReFungible'];
-    const mintTx = helper.api?.tx.unique.createMultipleItems(collectionId, normalizeAccountId(alice.address), types);
-    await expect(helper.signTransaction(alice, mintTx)).to.be.rejected;
+    await expect(helper.executeExtrinsic(
+      alice, 
+      'api.tx.unique.createMultipleItems', 
+      [collectionId, {Substrate: alice.address}, types],
+    )).to.be.rejectedWith(/nonfungible\.NotNonfungibleDataUsedToMintFungibleCollectionToken/);
   });
 
   itSub('Create tokens with different data limits <> maximum data limit', async ({helper}) => {

--- a/tests/src/creditFeesToTreasury.test.ts
+++ b/tests/src/creditFeesToTreasury.test.ts
@@ -16,11 +16,6 @@
 
 import './interfaces/augment-api-consts';
 import {IKeyringPair} from '@polkadot/types/types';
-import {
-  UNIQUE,
-} from './util/helpers';
-
-import {default as waitNewBlocks} from './substrate/wait-new-blocks';
 import {ApiPromise} from '@polkadot/api';
 import {usingPlaygrounds, expect, itSub} from './util/playgrounds';
 
@@ -63,7 +58,7 @@
   itSub('Total issuance does not change', async ({helper}) => {
     const api = helper.api!;
     await skipInflationBlock(api);
-    await waitNewBlocks(api, 1);
+    await helper.wait.newBlocks(1);
 
     const totalBefore = (await api.query.balances.totalIssuance()).toBigInt();
 
@@ -75,9 +70,8 @@
   });
 
   itSub('Sender balance decreased by fee+sent amount, Treasury balance increased by fee', async ({helper}) => {
-    const api = helper.api!;
-    await skipInflationBlock(api);
-    await waitNewBlocks(api, 1);
+    await skipInflationBlock(helper.api!);
+    await helper.wait.newBlocks(1);
 
     const treasuryBalanceBefore = await helper.balance.getSubstrate(TREASURY);
     const aliceBalanceBefore = await helper.balance.getSubstrate(alice.address);
@@ -96,7 +90,7 @@
 
   itSub('Treasury balance increased by failed tx fee', async ({helper}) => {
     const api = helper.api!;
-    await waitNewBlocks(api, 1);
+    await helper.wait.newBlocks(1);
 
     const treasuryBalanceBefore = await helper.balance.getSubstrate(TREASURY);
     const bobBalanceBefore = await helper.balance.getSubstrate(bob.address);
@@ -113,9 +107,8 @@
   });
 
   itSub('NFT Transactions also send fees to Treasury', async ({helper}) => {
-    const api = helper.api!;
-    await skipInflationBlock(api);
-    await waitNewBlocks(api, 1);
+    await skipInflationBlock(helper.api!);
+    await helper.wait.newBlocks(1);
 
     const treasuryBalanceBefore = await helper.balance.getSubstrate(TREASURY);
     const aliceBalanceBefore = await helper.balance.getSubstrate(alice.address);
@@ -131,9 +124,9 @@
   });
 
   itSub('Fees are sane', async ({helper}) => {
-    const api = helper.api!;
-    await skipInflationBlock(api);
-    await waitNewBlocks(api, 1);
+    const unique = helper.balance.getOneTokenNominal();
+    await skipInflationBlock(helper.api!);
+    await helper.wait.newBlocks(1);
 
     const aliceBalanceBefore = await helper.balance.getSubstrate(alice.address);
 
@@ -142,14 +135,13 @@
     const aliceBalanceAfter = await helper.balance.getSubstrate(alice.address);
     const fee = aliceBalanceBefore - aliceBalanceAfter;
 
-    expect(fee / UNIQUE < BigInt(Math.ceil(saneMaximumFee + createCollectionDeposit))).to.be.true;
-    expect(fee / UNIQUE < BigInt(Math.ceil(saneMinimumFee  + createCollectionDeposit))).to.be.true;
+    expect(fee / unique < BigInt(Math.ceil(saneMaximumFee + createCollectionDeposit))).to.be.true;
+    expect(fee / unique < BigInt(Math.ceil(saneMinimumFee  + createCollectionDeposit))).to.be.true;
   });
 
   itSub('NFT Transfer fee is close to 0.1 Unique', async ({helper}) => {
-    const api = helper.api!;
-    await skipInflationBlock(api);
-    await waitNewBlocks(api, 1);
+    await skipInflationBlock(helper.api!);
+    await helper.wait.newBlocks(1);
 
     const collection = await helper.nft.mintCollection(alice, {
       name: 'test',
@@ -163,7 +155,7 @@
     await token.transfer(alice, {Substrate: bob.address});
     const aliceBalanceAfter = await helper.balance.getSubstrate(alice.address);
 
-    const fee = Number(aliceBalanceBefore - aliceBalanceAfter) / Number(UNIQUE);
+    const fee = Number(aliceBalanceBefore - aliceBalanceAfter) / Number(helper.balance.getOneTokenNominal());
     const expectedTransferFee = 0.1;
     // fee drifts because of NextFeeMultiplier
     const tolerance = 0.001;

--- a/tests/src/destroyCollection.test.ts
+++ b/tests/src/destroyCollection.test.ts
@@ -15,10 +15,7 @@
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
 import {IKeyringPair} from '@polkadot/types/types';
-import {
-  Pallets,
-} from './util/helpers';
-import {itSub, expect, usingPlaygrounds} from './util/playgrounds';
+import {itSub, expect, usingPlaygrounds, Pallets} from './util/playgrounds';
 
 describe('integration test: ext. destroyCollection():', () => {
   let alice: IKeyringPair;

--- a/tests/src/eth/allowlist.test.ts
+++ b/tests/src/eth/allowlist.test.ts
@@ -89,20 +89,21 @@
     expect(await collectionEvm.methods.allowed(user).call({from: owner})).to.be.false;
   });
 
-  itEth('Collection allowlist can be added and removed by [sub] address', async ({helper}) => {
-    const owner = await helper.eth.createAccountWithBalance(donor);
-    const user = donor;
+  // TODO: Temprorary off. Need refactor
+  // itEth('Collection allowlist can be added and removed by [sub] address', async ({helper}) => {
+  //   const owner = await helper.eth.createAccountWithBalance(donor);
+  //   const user = donor;
 
-    const {collectionAddress, collectionId} = await helper.eth.createNonfungibleCollection(owner, 'A', 'B', 'C');
-    const collectionEvm = helper.ethNativeContract.collection(collectionAddress, 'nft', owner);
+  //   const {collectionAddress, collectionId} = await helper.eth.createNonfungibleCollection(owner, 'A', 'B', 'C');
+  //   const collectionEvm = helper.ethNativeContract.collection(collectionAddress, 'nft', owner);
 
-    expect(await helper.collection.allowed(collectionId, {Substrate: user.address})).to.be.false;
-    await collectionEvm.methods.addToCollectionAllowListSubstrate(user.addressRaw).send({from: owner});
-    expect(await helper.collection.allowed(collectionId, {Substrate: user.address})).to.be.true;
+  //   expect(await helper.collection.allowed(collectionId, {Substrate: user.address})).to.be.false;
+  //   await collectionEvm.methods.addToCollectionAllowListSubstrate(user.addressRaw).send({from: owner});
+  //   expect(await helper.collection.allowed(collectionId, {Substrate: user.address})).to.be.true;
 
-    await collectionEvm.methods.removeFromCollectionAllowListSubstrate(user.addressRaw).send({from: owner});
-    expect(await helper.collection.allowed(collectionId, {Substrate: user.address})).to.be.false;
-  });
+  //   await collectionEvm.methods.removeFromCollectionAllowListSubstrate(user.addressRaw).send({from: owner});
+  //   expect(await helper.collection.allowed(collectionId, {Substrate: user.address})).to.be.false;
+  // });
 
   itEth('Collection allowlist can not be add and remove [eth] address by not owner', async ({helper}) => {
     const owner = await helper.eth.createAccountWithBalance(donor);
@@ -122,21 +123,22 @@
     expect(await collectionEvm.methods.allowed(user).call({from: owner})).to.be.true;
   });
 
-  itEth('Collection allowlist can not be add and remove [sub] address by not owner', async ({helper}) => {
-    const owner = await helper.eth.createAccountWithBalance(donor);
-    const notOwner = await helper.eth.createAccountWithBalance(donor);
-    const user = donor;
+  // TODO: Temprorary off. Need refactor
+  // itEth('Collection allowlist can not be add and remove [sub] address by not owner', async ({helper}) => {
+  //   const owner = await helper.eth.createAccountWithBalance(donor);
+  //   const notOwner = await helper.eth.createAccountWithBalance(donor);
+  //   const user = donor;
 
-    const {collectionAddress, collectionId} = await helper.eth.createNonfungibleCollection(owner, 'A', 'B', 'C');
-    const collectionEvm = helper.ethNativeContract.collection(collectionAddress, 'nft', owner);
+  //   const {collectionAddress, collectionId} = await helper.eth.createNonfungibleCollection(owner, 'A', 'B', 'C');
+  //   const collectionEvm = helper.ethNativeContract.collection(collectionAddress, 'nft', owner);
 
-    expect(await helper.collection.allowed(collectionId, {Substrate: user.address})).to.be.false;
-    await expect(collectionEvm.methods.addToCollectionAllowListSubstrate(user.addressRaw).call({from: notOwner})).to.be.rejectedWith('NoPermission');
-    expect(await helper.collection.allowed(collectionId, {Substrate: user.address})).to.be.false;
-    await collectionEvm.methods.addToCollectionAllowListSubstrate(user.addressRaw).send({from: owner});
+  //   expect(await helper.collection.allowed(collectionId, {Substrate: user.address})).to.be.false;
+  //   await expect(collectionEvm.methods.addToCollectionAllowListSubstrate(user.addressRaw).call({from: notOwner})).to.be.rejectedWith('NoPermission');
+  //   expect(await helper.collection.allowed(collectionId, {Substrate: user.address})).to.be.false;
+  //   await collectionEvm.methods.addToCollectionAllowListSubstrate(user.addressRaw).send({from: owner});
 
-    expect(await helper.collection.allowed(collectionId, {Substrate: user.address})).to.be.true;
-    await expect(collectionEvm.methods.removeFromCollectionAllowListSubstrate(user.addressRaw).call({from: notOwner})).to.be.rejectedWith('NoPermission');
-    expect(await helper.collection.allowed(collectionId, {Substrate: user.address})).to.be.true;
-  });
+  //   expect(await helper.collection.allowed(collectionId, {Substrate: user.address})).to.be.true;
+  //   await expect(collectionEvm.methods.removeFromCollectionAllowListSubstrate(user.addressRaw).call({from: notOwner})).to.be.rejectedWith('NoPermission');
+  //   expect(await helper.collection.allowed(collectionId, {Substrate: user.address})).to.be.true;
+  // });
 });

--- a/tests/src/eth/api/UniqueFungible.sol
+++ b/tests/src/eth/api/UniqueFungible.sol
@@ -13,7 +13,7 @@
 }
 
 /// @title A contract that allows you to work with collections.
-/// @dev the ERC-165 identifier for this interface is 0x47dbc105
+/// @dev the ERC-165 identifier for this interface is 0x3e1e8083
 interface Collection is Dummy, ERC165 {
 	/// Set collection property.
 	///
@@ -48,15 +48,6 @@
 	/// @dev EVM selector for this function is: 0x7623402e,
 	///  or in textual repr: setCollectionSponsor(address)
 	function setCollectionSponsor(address sponsor) external;
-
-	/// Set the substrate sponsor of the collection.
-	///
-	/// @dev In order for sponsorship to work, it must be confirmed on behalf of the sponsor.
-	///
-	/// @param sponsor Substrate address of the sponsor from whose account funds will be debited for operations with the contract.
-	/// @dev EVM selector for this function is: 0xc74d6751,
-	///  or in textual repr: setCollectionSponsorSubstrate(uint256)
-	function setCollectionSponsorSubstrate(uint256 sponsor) external;
 
 	/// Whether there is a pending sponsor.
 	/// @dev EVM selector for this function is: 0x058ac185,
@@ -112,18 +103,6 @@
 	///  or in textual repr: contractAddress()
 	function contractAddress() external view returns (address);
 
-	/// Add collection admin by substrate address.
-	/// @param newAdmin Substrate administrator address.
-	/// @dev EVM selector for this function is: 0x5730062b,
-	///  or in textual repr: addCollectionAdminSubstrate(uint256)
-	function addCollectionAdminSubstrate(uint256 newAdmin) external;
-
-	/// Remove collection admin by substrate address.
-	/// @param admin Substrate administrator address.
-	/// @dev EVM selector for this function is: 0x4048fcf9,
-	///  or in textual repr: removeCollectionAdminSubstrate(uint256)
-	function removeCollectionAdminSubstrate(uint256 admin) external;
-
 	/// Add collection admin.
 	/// @param newAdmin Address of the added administrator.
 	/// @dev EVM selector for this function is: 0x92e462c7,
@@ -174,13 +153,6 @@
 	///  or in textual repr: addToCollectionAllowList(address)
 	function addToCollectionAllowList(address user) external;
 
-	/// Add substrate user to allowed list.
-	///
-	/// @param user User substrate address.
-	/// @dev EVM selector for this function is: 0xd06ad267,
-	///  or in textual repr: addToCollectionAllowListSubstrate(uint256)
-	function addToCollectionAllowListSubstrate(uint256 user) external;
-
 	/// Remove the user from the allowed list.
 	///
 	/// @param user Address of a removed user.
@@ -188,13 +160,6 @@
 	///  or in textual repr: removeFromCollectionAllowList(address)
 	function removeFromCollectionAllowList(address user) external;
 
-	/// Remove substrate user from allowed list.
-	///
-	/// @param user User substrate address.
-	/// @dev EVM selector for this function is: 0xa31913ed,
-	///  or in textual repr: removeFromCollectionAllowListSubstrate(uint256)
-	function removeFromCollectionAllowListSubstrate(uint256 user) external;
-
 	/// Switch permission for minting.
 	///
 	/// @param mode Enable if "true".
@@ -209,14 +174,6 @@
 	/// @dev EVM selector for this function is: 0x9811b0c7,
 	///  or in textual repr: isOwnerOrAdmin(address)
 	function isOwnerOrAdmin(address user) external view returns (bool);
-
-	/// Check that substrate account is the owner or admin of the collection
-	///
-	/// @param user account to verify
-	/// @return "true" if account is the owner or admin
-	/// @dev EVM selector for this function is: 0x68910e00,
-	///  or in textual repr: isOwnerOrAdminSubstrate(uint256)
-	function isOwnerOrAdminSubstrate(uint256 user) external view returns (bool);
 
 	/// Returns collection type
 	///
@@ -240,14 +197,6 @@
 	/// @dev EVM selector for this function is: 0x13af4035,
 	///  or in textual repr: setOwner(address)
 	function setOwner(address newOwner) external;
-
-	/// Changes collection owner to another substrate account
-	///
-	/// @dev Owner can be changed only by current owner
-	/// @param newOwner new owner substrate account
-	/// @dev EVM selector for this function is: 0xb212138f,
-	///  or in textual repr: setOwnerSubstrate(uint256)
-	function setOwnerSubstrate(uint256 newOwner) external;
 }
 
 /// @dev the ERC-165 identifier for this interface is 0x63034ac5

--- a/tests/src/eth/api/UniqueNFT.sol
+++ b/tests/src/eth/api/UniqueNFT.sol
@@ -62,7 +62,7 @@
 }
 
 /// @title A contract that allows you to work with collections.
-/// @dev the ERC-165 identifier for this interface is 0x47dbc105
+/// @dev the ERC-165 identifier for this interface is 0x3e1e8083
 interface Collection is Dummy, ERC165 {
 	/// Set collection property.
 	///
@@ -97,15 +97,6 @@
 	/// @dev EVM selector for this function is: 0x7623402e,
 	///  or in textual repr: setCollectionSponsor(address)
 	function setCollectionSponsor(address sponsor) external;
-
-	/// Set the substrate sponsor of the collection.
-	///
-	/// @dev In order for sponsorship to work, it must be confirmed on behalf of the sponsor.
-	///
-	/// @param sponsor Substrate address of the sponsor from whose account funds will be debited for operations with the contract.
-	/// @dev EVM selector for this function is: 0xc74d6751,
-	///  or in textual repr: setCollectionSponsorSubstrate(uint256)
-	function setCollectionSponsorSubstrate(uint256 sponsor) external;
 
 	/// Whether there is a pending sponsor.
 	/// @dev EVM selector for this function is: 0x058ac185,
@@ -161,18 +152,6 @@
 	///  or in textual repr: contractAddress()
 	function contractAddress() external view returns (address);
 
-	/// Add collection admin by substrate address.
-	/// @param newAdmin Substrate administrator address.
-	/// @dev EVM selector for this function is: 0x5730062b,
-	///  or in textual repr: addCollectionAdminSubstrate(uint256)
-	function addCollectionAdminSubstrate(uint256 newAdmin) external;
-
-	/// Remove collection admin by substrate address.
-	/// @param admin Substrate administrator address.
-	/// @dev EVM selector for this function is: 0x4048fcf9,
-	///  or in textual repr: removeCollectionAdminSubstrate(uint256)
-	function removeCollectionAdminSubstrate(uint256 admin) external;
-
 	/// Add collection admin.
 	/// @param newAdmin Address of the added administrator.
 	/// @dev EVM selector for this function is: 0x92e462c7,
@@ -223,13 +202,6 @@
 	///  or in textual repr: addToCollectionAllowList(address)
 	function addToCollectionAllowList(address user) external;
 
-	/// Add substrate user to allowed list.
-	///
-	/// @param user User substrate address.
-	/// @dev EVM selector for this function is: 0xd06ad267,
-	///  or in textual repr: addToCollectionAllowListSubstrate(uint256)
-	function addToCollectionAllowListSubstrate(uint256 user) external;
-
 	/// Remove the user from the allowed list.
 	///
 	/// @param user Address of a removed user.
@@ -237,13 +209,6 @@
 	///  or in textual repr: removeFromCollectionAllowList(address)
 	function removeFromCollectionAllowList(address user) external;
 
-	/// Remove substrate user from allowed list.
-	///
-	/// @param user User substrate address.
-	/// @dev EVM selector for this function is: 0xa31913ed,
-	///  or in textual repr: removeFromCollectionAllowListSubstrate(uint256)
-	function removeFromCollectionAllowListSubstrate(uint256 user) external;
-
 	/// Switch permission for minting.
 	///
 	/// @param mode Enable if "true".
@@ -258,14 +223,6 @@
 	/// @dev EVM selector for this function is: 0x9811b0c7,
 	///  or in textual repr: isOwnerOrAdmin(address)
 	function isOwnerOrAdmin(address user) external view returns (bool);
-
-	/// Check that substrate account is the owner or admin of the collection
-	///
-	/// @param user account to verify
-	/// @return "true" if account is the owner or admin
-	/// @dev EVM selector for this function is: 0x68910e00,
-	///  or in textual repr: isOwnerOrAdminSubstrate(uint256)
-	function isOwnerOrAdminSubstrate(uint256 user) external view returns (bool);
 
 	/// Returns collection type
 	///
@@ -289,14 +246,6 @@
 	/// @dev EVM selector for this function is: 0x13af4035,
 	///  or in textual repr: setOwner(address)
 	function setOwner(address newOwner) external;
-
-	/// Changes collection owner to another substrate account
-	///
-	/// @dev Owner can be changed only by current owner
-	/// @param newOwner new owner substrate account
-	/// @dev EVM selector for this function is: 0xb212138f,
-	///  or in textual repr: setOwnerSubstrate(uint256)
-	function setOwnerSubstrate(uint256 newOwner) external;
 }
 
 /// @dev anonymous struct

--- a/tests/src/eth/api/UniqueRefungible.sol
+++ b/tests/src/eth/api/UniqueRefungible.sol
@@ -62,7 +62,7 @@
 }
 
 /// @title A contract that allows you to work with collections.
-/// @dev the ERC-165 identifier for this interface is 0x47dbc105
+/// @dev the ERC-165 identifier for this interface is 0x3e1e8083
 interface Collection is Dummy, ERC165 {
 	/// Set collection property.
 	///
@@ -97,15 +97,6 @@
 	/// @dev EVM selector for this function is: 0x7623402e,
 	///  or in textual repr: setCollectionSponsor(address)
 	function setCollectionSponsor(address sponsor) external;
-
-	/// Set the substrate sponsor of the collection.
-	///
-	/// @dev In order for sponsorship to work, it must be confirmed on behalf of the sponsor.
-	///
-	/// @param sponsor Substrate address of the sponsor from whose account funds will be debited for operations with the contract.
-	/// @dev EVM selector for this function is: 0xc74d6751,
-	///  or in textual repr: setCollectionSponsorSubstrate(uint256)
-	function setCollectionSponsorSubstrate(uint256 sponsor) external;
 
 	/// Whether there is a pending sponsor.
 	/// @dev EVM selector for this function is: 0x058ac185,
@@ -161,18 +152,6 @@
 	///  or in textual repr: contractAddress()
 	function contractAddress() external view returns (address);
 
-	/// Add collection admin by substrate address.
-	/// @param newAdmin Substrate administrator address.
-	/// @dev EVM selector for this function is: 0x5730062b,
-	///  or in textual repr: addCollectionAdminSubstrate(uint256)
-	function addCollectionAdminSubstrate(uint256 newAdmin) external;
-
-	/// Remove collection admin by substrate address.
-	/// @param admin Substrate administrator address.
-	/// @dev EVM selector for this function is: 0x4048fcf9,
-	///  or in textual repr: removeCollectionAdminSubstrate(uint256)
-	function removeCollectionAdminSubstrate(uint256 admin) external;
-
 	/// Add collection admin.
 	/// @param newAdmin Address of the added administrator.
 	/// @dev EVM selector for this function is: 0x92e462c7,
@@ -223,13 +202,6 @@
 	///  or in textual repr: addToCollectionAllowList(address)
 	function addToCollectionAllowList(address user) external;
 
-	/// Add substrate user to allowed list.
-	///
-	/// @param user User substrate address.
-	/// @dev EVM selector for this function is: 0xd06ad267,
-	///  or in textual repr: addToCollectionAllowListSubstrate(uint256)
-	function addToCollectionAllowListSubstrate(uint256 user) external;
-
 	/// Remove the user from the allowed list.
 	///
 	/// @param user Address of a removed user.
@@ -237,13 +209,6 @@
 	///  or in textual repr: removeFromCollectionAllowList(address)
 	function removeFromCollectionAllowList(address user) external;
 
-	/// Remove substrate user from allowed list.
-	///
-	/// @param user User substrate address.
-	/// @dev EVM selector for this function is: 0xa31913ed,
-	///  or in textual repr: removeFromCollectionAllowListSubstrate(uint256)
-	function removeFromCollectionAllowListSubstrate(uint256 user) external;
-
 	/// Switch permission for minting.
 	///
 	/// @param mode Enable if "true".
@@ -258,14 +223,6 @@
 	/// @dev EVM selector for this function is: 0x9811b0c7,
 	///  or in textual repr: isOwnerOrAdmin(address)
 	function isOwnerOrAdmin(address user) external view returns (bool);
-
-	/// Check that substrate account is the owner or admin of the collection
-	///
-	/// @param user account to verify
-	/// @return "true" if account is the owner or admin
-	/// @dev EVM selector for this function is: 0x68910e00,
-	///  or in textual repr: isOwnerOrAdminSubstrate(uint256)
-	function isOwnerOrAdminSubstrate(uint256 user) external view returns (bool);
 
 	/// Returns collection type
 	///
@@ -289,14 +246,6 @@
 	/// @dev EVM selector for this function is: 0x13af4035,
 	///  or in textual repr: setOwner(address)
 	function setOwner(address newOwner) external;
-
-	/// Changes collection owner to another substrate account
-	///
-	/// @dev Owner can be changed only by current owner
-	/// @param newOwner new owner substrate account
-	/// @dev EVM selector for this function is: 0xb212138f,
-	///  or in textual repr: setOwnerSubstrate(uint256)
-	function setOwnerSubstrate(uint256 newOwner) external;
 }
 
 /// @dev anonymous struct

--- a/tests/src/eth/collectionSponsoring.test.ts
+++ b/tests/src/eth/collectionSponsoring.test.ts
@@ -40,25 +40,26 @@
     ]);
   });
 
-  itWeb3('Set substrate sponsor', async ({api, web3, privateKeyWrapper}) => {
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const collectionHelpers = evmCollectionHelpers(web3, owner);
-    let result = await collectionHelpers.methods.createNonfungibleCollection('Sponsor collection', '1', '1').send();
-    const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
-    const sponsor = privateKeyWrapper('//Alice');
-    const collectionEvm = evmCollection(web3, owner, collectionIdAddress);
+  // TODO: Temprorary off. Need refactor
+  // itWeb3('Set substrate sponsor', async ({api, web3, privateKeyWrapper}) => {
+  //   const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
+  //   const collectionHelpers = evmCollectionHelpers(web3, owner);
+  //   let result = await collectionHelpers.methods.createNonfungibleCollection('Sponsor collection', '1', '1').send();
+  //   const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
+  //   const sponsor = privateKeyWrapper('//Alice');
+  //   const collectionEvm = evmCollection(web3, owner, collectionIdAddress);
 
-    expect(await collectionEvm.methods.hasCollectionPendingSponsor().call({from: owner})).to.be.false;
-    result = await collectionEvm.methods.setCollectionSponsorSubstrate(sponsor.addressRaw).send({from: owner});
-    expect(await collectionEvm.methods.hasCollectionPendingSponsor().call({from: owner})).to.be.true;
+  //   expect(await collectionEvm.methods.hasCollectionPendingSponsor().call({from: owner})).to.be.false;
+  //   result = await collectionEvm.methods.setCollectionSponsorSubstrate(sponsor.addressRaw).send({from: owner});
+  //   expect(await collectionEvm.methods.hasCollectionPendingSponsor().call({from: owner})).to.be.true;
     
-    const confirmTx = await api.tx.unique.confirmSponsorship(collectionId);
-    await submitTransactionAsync(sponsor, confirmTx);
-    expect(await collectionEvm.methods.hasCollectionPendingSponsor().call({from: owner})).to.be.false;
+  //   const confirmTx = await api.tx.unique.confirmSponsorship(collectionId);
+  //   await submitTransactionAsync(sponsor, confirmTx);
+  //   expect(await collectionEvm.methods.hasCollectionPendingSponsor().call({from: owner})).to.be.false;
     
-    const sponsorTuple = await collectionEvm.methods.collectionSponsor().call({from: owner});
-    expect(bigIntToSub(api, BigInt(sponsorTuple[1]))).to.be.eq(sponsor.address);
-  });
+  //   const sponsorTuple = await collectionEvm.methods.collectionSponsor().call({from: owner});
+  //   expect(bigIntToSub(api, BigInt(sponsorTuple[1]))).to.be.eq(sponsor.address);
+  // });
 
   itWeb3('Remove sponsor', async ({api, web3, privateKeyWrapper}) => {
     const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
@@ -150,60 +151,61 @@
     }
   });
 
-  itWeb3('Sponsoring collection from substrate address via access list', async ({api, web3, privateKeyWrapper}) => {
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const collectionHelpers = evmCollectionHelpers(web3, owner);
-    const result = await collectionHelpers.methods.createNonfungibleCollection('Sponsor collection', '1', '1').send();
-    const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
-    const sponsor = privateKeyWrapper('//Alice');
-    const collectionEvm = evmCollection(web3, owner, collectionIdAddress);
+  // TODO: Temprorary off. Need refactor
+  // itWeb3('Sponsoring collection from substrate address via access list', async ({api, web3, privateKeyWrapper}) => {
+  //   const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
+  //   const collectionHelpers = evmCollectionHelpers(web3, owner);
+  //   const result = await collectionHelpers.methods.createNonfungibleCollection('Sponsor collection', '1', '1').send();
+  //   const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
+  //   const sponsor = privateKeyWrapper('//Alice');
+  //   const collectionEvm = evmCollection(web3, owner, collectionIdAddress);
 
-    await collectionEvm.methods.setCollectionSponsorSubstrate(sponsor.addressRaw).send({from: owner});
+  //   await collectionEvm.methods.setCollectionSponsorSubstrate(sponsor.addressRaw).send({from: owner});
     
-    const confirmTx = await api.tx.unique.confirmSponsorship(collectionId);
-    await submitTransactionAsync(sponsor, confirmTx);
+  //   const confirmTx = await api.tx.unique.confirmSponsorship(collectionId);
+  //   await submitTransactionAsync(sponsor, confirmTx);
     
-    const user = createEthAccount(web3);
-    const nextTokenId = await collectionEvm.methods.nextTokenId().call();
-    expect(nextTokenId).to.be.equal('1');
+  //   const user = createEthAccount(web3);
+  //   const nextTokenId = await collectionEvm.methods.nextTokenId().call();
+  //   expect(nextTokenId).to.be.equal('1');
 
-    await collectionEvm.methods.setCollectionAccess(1 /*'AllowList'*/).send({from: owner});
-    await collectionEvm.methods.addToCollectionAllowList(user).send({from: owner});
-    await collectionEvm.methods.setCollectionMintMode(true).send({from: owner});
+  //   await collectionEvm.methods.setCollectionAccess(1 /*'AllowList'*/).send({from: owner});
+  //   await collectionEvm.methods.addToCollectionAllowList(user).send({from: owner});
+  //   await collectionEvm.methods.setCollectionMintMode(true).send({from: owner});
 
-    const ownerBalanceBefore = await ethBalanceViaSub(api, owner);
-    const sponsorBalanceBefore = (await getBalance(api, [sponsor.address]))[0];
+  //   const ownerBalanceBefore = await ethBalanceViaSub(api, owner);
+  //   const sponsorBalanceBefore = (await getBalance(api, [sponsor.address]))[0];
 
-    {
-      const nextTokenId = await collectionEvm.methods.nextTokenId().call();
-      expect(nextTokenId).to.be.equal('1');
-      const result = await collectionEvm.methods.mintWithTokenURI(
-        user,
-        nextTokenId,
-        'Test URI',
-      ).send({from: user});
-      const events = normalizeEvents(result.events);
+  //   {
+  //     const nextTokenId = await collectionEvm.methods.nextTokenId().call();
+  //     expect(nextTokenId).to.be.equal('1');
+  //     const result = await collectionEvm.methods.mintWithTokenURI(
+  //       user,
+  //       nextTokenId,
+  //       'Test URI',
+  //     ).send({from: user});
+  //     const events = normalizeEvents(result.events);
 
-      expect(events).to.be.deep.equal([
-        {
-          address: collectionIdAddress,
-          event: 'Transfer',
-          args: {
-            from: '0x0000000000000000000000000000000000000000',
-            to: user,
-            tokenId: nextTokenId,
-          },
-        },
-      ]);
+  //     expect(events).to.be.deep.equal([
+  //       {
+  //         address: collectionIdAddress,
+  //         event: 'Transfer',
+  //         args: {
+  //           from: '0x0000000000000000000000000000000000000000',
+  //           to: user,
+  //           tokenId: nextTokenId,
+  //         },
+  //       },
+  //     ]);
 
-      const ownerBalanceAfter = await ethBalanceViaSub(api, owner);
-      const sponsorBalanceAfter = (await getBalance(api, [sponsor.address]))[0];
+  //     const ownerBalanceAfter = await ethBalanceViaSub(api, owner);
+  //     const sponsorBalanceAfter = (await getBalance(api, [sponsor.address]))[0];
 
-      expect(await collectionEvm.methods.tokenURI(nextTokenId).call()).to.be.equal('Test URI');
-      expect(ownerBalanceBefore).to.be.eq(ownerBalanceAfter);
-      expect(sponsorBalanceBefore > sponsorBalanceAfter).to.be.true;
-    }
-  });
+  //     expect(await collectionEvm.methods.tokenURI(nextTokenId).call()).to.be.equal('Test URI');
+  //     expect(ownerBalanceBefore).to.be.eq(ownerBalanceAfter);
+  //     expect(sponsorBalanceBefore > sponsorBalanceAfter).to.be.true;
+  //   }
+  // });
 
   itWeb3('Check that transaction via EVM spend money from sponsor address', async ({api, web3, privateKeyWrapper}) => {
     const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);

--- a/tests/src/eth/fungible.test.ts
+++ b/tests/src/eth/fungible.test.ts
@@ -14,204 +14,132 @@
 // You should have received a copy of the GNU General Public License
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
-import {approveExpectSuccess, createCollection, createCollectionExpectSuccess, createFungibleItemExpectSuccess, transferExpectSuccess, transferFromExpectSuccess, UNIQUE} from '../util/helpers';
-import {collectionIdToAddress, createEthAccount, createEthAccountWithBalance, evmCollection, GAS_ARGS, itWeb3, normalizeEvents, recordEthFee, recordEvents, subToEth, transferBalanceToEth} from './util/helpers';
-import fungibleAbi from './fungibleAbi.json';
-import {expect} from 'chai';
-import {submitTransactionAsync} from '../substrate/substrate-api';
+import {expect, itEth, usingEthPlaygrounds} from './util/playgrounds';
+import {IKeyringPair} from '@polkadot/types/types';
 
 describe('Fungible: Information getting', () => {
-  itWeb3('totalSupply', async ({api, web3, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      name: 'token name',
-      mode: {type: 'Fungible', decimalPoints: 0},
+  let donor: IKeyringPair;
+  let alice: IKeyringPair;
+
+  before(async function() {
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      donor = privateKey('//Alice');
+      [alice] = await helper.arrange.createAccounts([20n], donor);
     });
-    const alice = privateKeyWrapper('//Alice');
+  });
 
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
+  itEth('totalSupply', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const collection = await helper.ft.mintCollection(alice);
+    await collection.mint(alice, 200n);
 
-    await createFungibleItemExpectSuccess(alice, collection, {Value: 200n}, {Substrate: alice.address});
-
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(fungibleAbi as any, address, {from: caller, ...GAS_ARGS});
+    const contract = helper.ethNativeContract.collectionById(collection.collectionId, 'ft', caller);
     const totalSupply = await contract.methods.totalSupply().call();
-
     expect(totalSupply).to.equal('200');
   });
 
-  itWeb3('balanceOf', async ({api, web3, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      name: 'token name',
-      mode: {type: 'Fungible', decimalPoints: 0},
-    });
-    const alice = privateKeyWrapper('//Alice');
+  itEth('balanceOf', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const collection = await helper.ft.mintCollection(alice);
+    await collection.mint(alice, 200n, {Ethereum: caller});
 
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-
-    await createFungibleItemExpectSuccess(alice, collection, {Value: 200n}, {Ethereum: caller});
-
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(fungibleAbi as any, address, {from: caller, ...GAS_ARGS});
+    const contract = helper.ethNativeContract.collectionById(collection.collectionId, 'ft', caller);
     const balance = await contract.methods.balanceOf(caller).call();
-
     expect(balance).to.equal('200');
   });
 });
 
 describe('Fungible: Plain calls', () => {
-  itWeb3('Can perform mint()', async ({web3, api, privateKeyWrapper}) => {
-    const alice = privateKeyWrapper('//Alice');
-    const collection = await createCollection(api, alice, {
-      name: 'token name',
-      mode: {type: 'Fungible', decimalPoints: 0},
+  let donor: IKeyringPair;
+  let alice: IKeyringPair;
+
+  before(async function() {
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      donor = privateKey('//Alice');
+      [alice] = await helper.arrange.createAccounts([20n], donor);
     });
+  });
 
-    const receiver = createEthAccount(web3);
+  itEth('Can perform mint()', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
+    const collection = await helper.ft.mintCollection(alice);
+    await collection.addAdmin(alice, {Ethereum: owner});
 
-    const collectionIdAddress = collectionIdToAddress(collection.collectionId);
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const changeAdminTx = api.tx.unique.addCollectionAdmin(collection.collectionId, {Ethereum: owner});
-    await submitTransactionAsync(alice, changeAdminTx);
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'ft', owner);
 
-    const collectionContract = evmCollection(web3, owner, collectionIdAddress, {type: 'Fungible', decimalPoints: 0});
-    const result = await collectionContract.methods.mint(receiver, 100).send();
-    const events = normalizeEvents(result.events);
+    const result = await contract.methods.mint(receiver, 100).send();
     
-    expect(events).to.be.deep.equal([
-      {
-        address: collectionIdAddress,
-        event: 'Transfer',
-        args: {
-          from: '0x0000000000000000000000000000000000000000',
-          to: receiver,
-          value: '100',
-        },
-      },
-    ]);
+    const event = result.events.Transfer;
+    expect(event.address).to.equal(collectionAddress);
+    expect(event.returnValues.from).to.equal('0x0000000000000000000000000000000000000000');
+    expect(event.returnValues.to).to.equal(receiver);
+    expect(event.returnValues.value).to.equal('100');
   });
-
-  itWeb3('Can perform mintBulk()', async ({web3, api, privateKeyWrapper}) => {
-    const alice = privateKeyWrapper('//Alice');
-    const collection = await createCollection(api, alice, {
-      name: 'token name',
-      mode: {type: 'Fungible', decimalPoints: 0},
-    });
 
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const receiver1 = createEthAccount(web3);
-    const receiver2 = createEthAccount(web3);
-    const receiver3 = createEthAccount(web3);
-
-    const collectionIdAddress = collectionIdToAddress(collection.collectionId);
-    const changeAdminTx = api.tx.unique.addCollectionAdmin(collection.collectionId, {Ethereum: owner});
-    await submitTransactionAsync(alice, changeAdminTx);
+  itEth('Can perform mintBulk()', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const bulkSize = 3;
+    const receivers = [...new Array(bulkSize)].map(() => helper.eth.createAccount());
+    const collection = await helper.ft.mintCollection(alice);
+    await collection.addAdmin(alice, {Ethereum: owner});
 
-    const collectionContract = evmCollection(web3, owner, collectionIdAddress, {type: 'Fungible', decimalPoints: 0});
-    const result = await collectionContract.methods.mintBulk([
-      [receiver1, 10],
-      [receiver2, 20],
-      [receiver3, 30],
-    ]).send();
-    const events = normalizeEvents(result.events);
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'ft', owner);
 
-    expect(events).to.be.deep.contain({
-      address:collectionIdAddress,
-      event: 'Transfer',
-      args: {
-        from: '0x0000000000000000000000000000000000000000',
-        to: receiver1,
-        value: '10',
-      },
-    });
-    
-    expect(events).to.be.deep.contain({
-      address:collectionIdAddress,
-      event: 'Transfer',
-      args: {
-        from: '0x0000000000000000000000000000000000000000',
-        to: receiver2,
-        value: '20',
-      },
-    });
-    
-    expect(events).to.be.deep.contain({
-      address:collectionIdAddress,
-      event: 'Transfer',
-      args: {
-        from: '0x0000000000000000000000000000000000000000',
-        to: receiver3,
-        value: '30',
-      },
-    });
+    const result = await contract.methods.mintBulk(Array.from({length: bulkSize}, (_, i) => (
+      [receivers[i], (i + 1) * 10]
+    ))).send();
+    const events = result.events.Transfer.sort((a: any, b: any) => +a.returnValues.value - b.returnValues.value);
+    for (let i = 0; i < bulkSize; i++) {
+      const event = events[i];
+      expect(event.address).to.equal(collectionAddress);
+      expect(event.returnValues.from).to.equal('0x0000000000000000000000000000000000000000');
+      expect(event.returnValues.to).to.equal(receivers[i]);
+      expect(event.returnValues.value).to.equal(String(10 * (i + 1)));
+    }
   });
 
-  itWeb3('Can perform burn()', async ({web3, api, privateKeyWrapper}) => {
-    const alice = privateKeyWrapper('//Alice');
-    const collection = await createCollection(api, alice, {
-      name: 'token name',
-      mode: {type: 'Fungible', decimalPoints: 0},
-    });
-
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const changeAdminTx = api.tx.unique.addCollectionAdmin(collection.collectionId, {Ethereum: owner});
-    await submitTransactionAsync(alice, changeAdminTx);
-    const receiver = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
+  itEth('Can perform burn()', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const receiver = await helper.eth.createAccountWithBalance(donor);
+    const collection = await helper.ft.mintCollection(alice);
+    await collection.addAdmin(alice, {Ethereum: owner});
 
-    const collectionIdAddress = collectionIdToAddress(collection.collectionId);
-    const collectionContract = evmCollection(web3, owner, collectionIdAddress, {type: 'Fungible', decimalPoints: 0});
-    await collectionContract.methods.mint(receiver, 100).send();
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'ft', owner);
+    await contract.methods.mint(receiver, 100).send();
 
-    const result = await collectionContract.methods.burnFrom(receiver, 49).send({from: receiver});
+    const result = await contract.methods.burnFrom(receiver, 49).send({from: receiver});
     
-    const events = normalizeEvents(result.events);
-
-    expect(events).to.be.deep.equal([
-      {
-        address: collectionIdAddress,
-        event: 'Transfer',
-        args: {
-          from: receiver,
-          to: '0x0000000000000000000000000000000000000000',
-          value: '49',
-        },
-      },
-    ]);
+    const event = result.events.Transfer;
+    expect(event.address).to.equal(collectionAddress);
+    expect(event.returnValues.from).to.equal(receiver);
+    expect(event.returnValues.to).to.equal('0x0000000000000000000000000000000000000000');
+    expect(event.returnValues.value).to.equal('49');
 
-    const balance = await collectionContract.methods.balanceOf(receiver).call();
+    const balance = await contract.methods.balanceOf(receiver).call();
     expect(balance).to.equal('51');
   });
 
-  itWeb3('Can perform approve()', async ({web3, api, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      name: 'token name',
-      mode: {type: 'Fungible', decimalPoints: 0},
-    });
-    const alice = privateKeyWrapper('//Alice');
+  itEth('Can perform approve()', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const spender = helper.eth.createAccount();
+    const collection = await helper.ft.mintCollection(alice);
+    await collection.mint(alice, 200n, {Ethereum: owner});
 
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-
-    await createFungibleItemExpectSuccess(alice, collection, {Value: 200n}, {Ethereum: owner});
-
-    const spender = createEthAccount(web3);
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'ft', owner);
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(fungibleAbi as any, address, {from: owner, ...GAS_ARGS});
-
     {
       const result = await contract.methods.approve(spender, 100).send({from: owner});
-      const events = normalizeEvents(result.events);
 
-      expect(events).to.be.deep.equal([
-        {
-          address,
-          event: 'Approval',
-          args: {
-            owner,
-            spender,
-            value: '100',
-          },
-        },
-      ]);
+      const event = result.events.Approval;
+      expect(event.address).to.be.equal(collectionAddress);
+      expect(event.returnValues.owner).to.be.equal(owner);
+      expect(event.returnValues.spender).to.be.equal(spender);
+      expect(event.returnValues.value).to.be.equal('100');
     }
 
     {
@@ -220,51 +148,32 @@
     }
   });
 
-  itWeb3('Can perform transferFrom()', async ({web3, api, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      name: 'token name',
-      mode: {type: 'Fungible', decimalPoints: 0},
-    });
-    const alice = privateKeyWrapper('//Alice');
-
-    const owner = createEthAccount(web3);
-    await transferBalanceToEth(api, alice, owner);
-
-    await createFungibleItemExpectSuccess(alice, collection, {Value: 200n}, {Ethereum: owner});
-
-    const spender = createEthAccount(web3);
-    await transferBalanceToEth(api, alice, spender);
-
-    const receiver = createEthAccount(web3);
+  itEth('Can perform transferFrom()', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const spender = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
+    const collection = await helper.ft.mintCollection(alice);
+    await collection.mint(alice, 200n, {Ethereum: owner});
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(fungibleAbi as any, address, {from: owner, ...GAS_ARGS});
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'ft', owner);
 
     await contract.methods.approve(spender, 100).send();
 
     {
       const result = await contract.methods.transferFrom(owner, receiver, 49).send({from: spender});
-      const events = normalizeEvents(result.events);
-      expect(events).to.be.deep.equal([
-        {
-          address,
-          event: 'Transfer',
-          args: {
-            from: owner,
-            to: receiver,
-            value: '49',
-          },
-        },
-        {
-          address,
-          event: 'Approval',
-          args: {
-            owner,
-            spender,
-            value: '51',
-          },
-        },
-      ]);
+      
+      let event = result.events.Transfer;
+      expect(event.address).to.be.equal(collectionAddress);
+      expect(event.returnValues.from).to.be.equal(owner);
+      expect(event.returnValues.to).to.be.equal(receiver);
+      expect(event.returnValues.value).to.be.equal('49');
+
+      event = result.events.Approval;
+      expect(event.address).to.be.equal(collectionAddress);
+      expect(event.returnValues.owner).to.be.equal(owner);
+      expect(event.returnValues.spender).to.be.equal(spender);
+      expect(event.returnValues.value).to.be.equal('51');
     }
 
     {
@@ -278,38 +187,23 @@
     }
   });
 
-  itWeb3('Can perform transfer()', async ({web3, api, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      name: 'token name',
-      mode: {type: 'Fungible', decimalPoints: 0},
-    });
-    const alice = privateKeyWrapper('//Alice');
-
-    const owner = createEthAccount(web3);
-    await transferBalanceToEth(api, alice, owner);
-
-    await createFungibleItemExpectSuccess(alice, collection, {Value: 200n}, {Ethereum: owner});
-
-    const receiver = createEthAccount(web3);
-    await transferBalanceToEth(api, alice, receiver);
+  itEth('Can perform transfer()', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const receiver = await helper.eth.createAccountWithBalance(donor);
+    const collection = await helper.ft.mintCollection(alice);
+    await collection.mint(alice, 200n, {Ethereum: owner});
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(fungibleAbi as any, address, {from: owner, ...GAS_ARGS});
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'ft', owner);
 
     {
       const result = await contract.methods.transfer(receiver, 50).send({from: owner});
-      const events = normalizeEvents(result.events);
-      expect(events).to.be.deep.equal([
-        {
-          address,
-          event: 'Transfer',
-          args: {
-            from: owner,
-            to: receiver,
-            value: '50',
-          },
-        },
-      ]);
+      
+      const event = result.events.Transfer;
+      expect(event.address).to.be.equal(collectionAddress);
+      expect(event.returnValues.from).to.be.equal(owner);
+      expect(event.returnValues.to).to.be.equal(receiver);
+      expect(event.returnValues.value).to.be.equal('50');
     }
 
     {
@@ -325,162 +219,141 @@
 });
 
 describe('Fungible: Fees', () => {
-  itWeb3('approve() call fee is less than 0.2UNQ', async ({web3, api, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'Fungible', decimalPoints: 0},
+  let donor: IKeyringPair;
+  let alice: IKeyringPair;
+
+  before(async function() {
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      donor = privateKey('//Alice');
+      [alice] = await helper.arrange.createAccounts([20n], donor);
     });
-    const alice = privateKeyWrapper('//Alice');
+  });
+  
+  itEth('approve() call fee is less than 0.2UNQ', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const spender = helper.eth.createAccount();
+    const collection = await helper.ft.mintCollection(alice);
+    await collection.mint(alice, 200n, {Ethereum: owner});
 
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const spender = createEthAccount(web3);
-
-    await createFungibleItemExpectSuccess(alice, collection, {Value: 200n}, {Ethereum: owner});
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'ft', owner);
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(fungibleAbi as any, address, {from: owner, ...GAS_ARGS});
-
-    const cost = await recordEthFee(api, owner, () => contract.methods.approve(spender, 100).send({from: owner}));
-    expect(cost < BigInt(0.2 * Number(UNIQUE)));
+    const cost = await helper.eth.recordCallFee(owner, () => contract.methods.approve(spender, 100).send({from: owner}));
+    expect(cost < BigInt(0.2 * Number(helper.balance.getOneTokenNominal())));
   });
 
-  itWeb3('transferFrom() call fee is less than 0.2UNQ', async ({web3, api, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'Fungible', decimalPoints: 0},
-    });
-    const alice = privateKeyWrapper('//Alice');
-
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const spender = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-
-    await createFungibleItemExpectSuccess(alice, collection, {Value: 200n}, {Ethereum: owner});
+  itEth('transferFrom() call fee is less than 0.2UNQ', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const spender = await helper.eth.createAccountWithBalance(donor);
+    const collection = await helper.ft.mintCollection(alice);
+    await collection.mint(alice, 200n, {Ethereum: owner});
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(fungibleAbi as any, address, {from: owner, ...GAS_ARGS});
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'ft', owner);
 
     await contract.methods.approve(spender, 100).send({from: owner});
 
-    const cost = await recordEthFee(api, spender, () => contract.methods.transferFrom(owner, spender, 100).send({from: spender}));
-    expect(cost < BigInt(0.2 * Number(UNIQUE)));
+    const cost = await helper.eth.recordCallFee(spender, () => contract.methods.transferFrom(owner, spender, 100).send({from: spender}));
+    expect(cost < BigInt(0.2 * Number(helper.balance.getOneTokenNominal())));
   });
-
-  itWeb3('transfer() call fee is less than 0.2UNQ', async ({web3, api, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'Fungible', decimalPoints: 0},
-    });
-    const alice = privateKeyWrapper('//Alice');
 
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const receiver = createEthAccount(web3);
-
-    await createFungibleItemExpectSuccess(alice, collection, {Value: 200n}, {Ethereum: owner});
+  itEth('transfer() call fee is less than 0.2UNQ', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
+    const collection = await helper.ft.mintCollection(alice);
+    await collection.mint(alice, 200n, {Ethereum: owner});
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(fungibleAbi as any, address, {from: owner, ...GAS_ARGS});
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'ft', owner);
 
-    const cost = await recordEthFee(api, owner, () => contract.methods.transfer(receiver, 100).send({from: owner}));
-    expect(cost < BigInt(0.2 * Number(UNIQUE)));
+    const cost = await helper.eth.recordCallFee(owner, () => contract.methods.transfer(receiver, 100).send({from: owner}));
+    expect(cost < BigInt(0.2 * Number(helper.balance.getOneTokenNominal())));
   });
 });
 
 describe('Fungible: Substrate calls', () => {
-  itWeb3('Events emitted for approve()', async ({web3, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'Fungible', decimalPoints: 0},
+  let donor: IKeyringPair;
+  let alice: IKeyringPair;
+
+  before(async function() {
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      donor = privateKey('//Alice');
+      [alice] = await helper.arrange.createAccounts([20n], donor);
     });
-    const alice = privateKeyWrapper('//Alice');
+  });
 
-    const receiver = createEthAccount(web3);
+  itEth('Events emitted for approve()', async ({helper}) => {
+    const receiver = helper.eth.createAccount();
+    const collection = await helper.ft.mintCollection(alice);
+    await collection.mint(alice, 200n);
 
-    await createFungibleItemExpectSuccess(alice, collection, {Value: 200n});
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'ft');
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(fungibleAbi as any, address);
-
-    const events = await recordEvents(contract, async () => {
-      await approveExpectSuccess(collection, 0, alice, {Ethereum: receiver}, 100);
+    const events: any = [];
+    contract.events.allEvents((_: any, event: any) => {
+      events.push(event);
     });
+    await collection.approveTokens(alice, {Ethereum: receiver}, 100n);
 
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Approval',
-        args: {
-          owner: subToEth(alice.address),
-          spender: receiver,
-          value: '100',
-        },
-      },
-    ]);
+    const event = events[0];
+    expect(event.event).to.be.equal('Approval');
+    expect(event.address).to.be.equal(collectionAddress);
+    expect(event.returnValues.owner).to.be.equal(helper.address.substrateToEth(alice.address));
+    expect(event.returnValues.spender).to.be.equal(receiver);
+    expect(event.returnValues.value).to.be.equal('100');
   });
 
-  itWeb3('Events emitted for transferFrom()', async ({web3, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'Fungible', decimalPoints: 0},
-    });
-    const alice = privateKeyWrapper('//Alice');
-    const bob = privateKeyWrapper('//Bob');
+  itEth('Events emitted for transferFrom()', async ({helper}) => {
+    const [bob] = await helper.arrange.createAccounts([10n], donor);
+    const receiver = helper.eth.createAccount();
+    const collection = await helper.ft.mintCollection(alice);
+    await collection.mint(alice, 200n);
+    await collection.approveTokens(alice, {Substrate: bob.address}, 100n);
 
-    const receiver = createEthAccount(web3);
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'ft');
 
-    await createFungibleItemExpectSuccess(alice, collection, {Value: 200n});
-    await approveExpectSuccess(collection, 0, alice, bob.address, 100);
+    const events: any = [];
+    contract.events.allEvents((_: any, event: any) => {
+      events.push(event);
+    });
+    await collection.transferFrom(bob, {Substrate: alice.address}, {Ethereum: receiver}, 51n);
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(fungibleAbi as any, address);
+    let event = events[0];
+    expect(event.event).to.be.equal('Transfer');
+    expect(event.address).to.be.equal(collectionAddress);
+    expect(event.returnValues.from).to.be.equal(helper.address.substrateToEth(alice.address));
+    expect(event.returnValues.to).to.be.equal(receiver);
+    expect(event.returnValues.value).to.be.equal('51');
 
-    const events = await recordEvents(contract, async () => {
-      await transferFromExpectSuccess(collection, 0, bob, alice, {Ethereum: receiver}, 51, 'Fungible');
-    });
-
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: subToEth(alice.address),
-          to: receiver,
-          value: '51',
-        },
-      },
-      {
-        address,
-        event: 'Approval',
-        args: {
-          owner: subToEth(alice.address),
-          spender: subToEth(bob.address),
-          value: '49',
-        },
-      },
-    ]);
+    event = events[1];
+    expect(event.event).to.be.equal('Approval');
+    expect(event.address).to.be.equal(collectionAddress);
+    expect(event.returnValues.owner).to.be.equal(helper.address.substrateToEth(alice.address));
+    expect(event.returnValues.spender).to.be.equal(helper.address.substrateToEth(bob.address));
+    expect(event.returnValues.value).to.be.equal('49');
   });
 
-  itWeb3('Events emitted for transfer()', async ({web3, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'Fungible', decimalPoints: 0},
-    });
-    const alice = privateKeyWrapper('//Alice');
+  itEth('Events emitted for transfer()', async ({helper}) => {
+    const receiver = helper.eth.createAccount();
+    const collection = await helper.ft.mintCollection(alice);
+    await collection.mint(alice, 200n);
 
-    const receiver = createEthAccount(web3);
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'ft');
 
-    await createFungibleItemExpectSuccess(alice, collection, {Value: 200n});
-
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(fungibleAbi as any, address);
-
-    const events = await recordEvents(contract, async () => {
-      await transferExpectSuccess(collection, 0, alice, {Ethereum:receiver}, 51, 'Fungible');
+    const events: any = [];
+    contract.events.allEvents((_: any, event: any) => {
+      events.push(event);
     });
+    await collection.transfer(alice, {Ethereum:receiver}, 51n);
 
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: subToEth(alice.address),
-          to: receiver,
-          value: '51',
-        },
-      },
-    ]);
+    const event = events[0];
+    expect(event.event).to.be.equal('Transfer');
+    expect(event.address).to.be.equal(collectionAddress);
+    expect(event.returnValues.from).to.be.equal(helper.address.substrateToEth(alice.address));
+    expect(event.returnValues.to).to.be.equal(receiver);
+    expect(event.returnValues.value).to.be.equal('51');
   });
 });

--- a/tests/src/eth/fungibleAbi.json
+++ b/tests/src/eth/fungibleAbi.json
@@ -60,27 +60,9 @@
   },
   {
     "inputs": [
-      { "internalType": "uint256", "name": "newAdmin", "type": "uint256" }
-    ],
-    "name": "addCollectionAdminSubstrate",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
       { "internalType": "address", "name": "user", "type": "address" }
     ],
     "name": "addToCollectionAllowList",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      { "internalType": "uint256", "name": "user", "type": "uint256" }
-    ],
-    "name": "addToCollectionAllowListSubstrate",
     "outputs": [],
     "stateMutability": "nonpayable",
     "type": "function"
@@ -214,15 +196,6 @@
       { "internalType": "address", "name": "user", "type": "address" }
     ],
     "name": "isOwnerOrAdmin",
-    "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
-    "stateMutability": "view",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      { "internalType": "uint256", "name": "user", "type": "uint256" }
-    ],
-    "name": "isOwnerOrAdminSubstrate",
     "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
     "stateMutability": "view",
     "type": "function"
@@ -271,15 +244,6 @@
     "type": "function"
   },
   {
-    "inputs": [
-      { "internalType": "uint256", "name": "admin", "type": "uint256" }
-    ],
-    "name": "removeCollectionAdminSubstrate",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
     "inputs": [],
     "name": "removeCollectionSponsor",
     "outputs": [],
@@ -291,15 +255,6 @@
       { "internalType": "address", "name": "user", "type": "address" }
     ],
     "name": "removeFromCollectionAllowList",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      { "internalType": "uint256", "name": "user", "type": "uint256" }
-    ],
-    "name": "removeFromCollectionAllowListSubstrate",
     "outputs": [],
     "stateMutability": "nonpayable",
     "type": "function"
@@ -380,27 +335,9 @@
   },
   {
     "inputs": [
-      { "internalType": "uint256", "name": "sponsor", "type": "uint256" }
-    ],
-    "name": "setCollectionSponsorSubstrate",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
       { "internalType": "address", "name": "newOwner", "type": "address" }
     ],
     "name": "setOwner",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      { "internalType": "uint256", "name": "newOwner", "type": "uint256" }
-    ],
-    "name": "setOwnerSubstrate",
     "outputs": [],
     "stateMutability": "nonpayable",
     "type": "function"

--- a/tests/src/eth/nonFungible.test.ts
+++ b/tests/src/eth/nonFungible.test.ts
@@ -14,72 +14,78 @@
 // You should have received a copy of the GNU General Public License
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
-import {approveExpectSuccess, burnItemExpectSuccess, createCollectionExpectSuccess, createItemExpectSuccess, transferExpectSuccess, transferFromExpectSuccess, UNIQUE} from '../util/helpers';
-import {collectionIdToAddress, createEthAccount, createEthAccountWithBalance, evmCollection, evmCollectionHelpers, GAS_ARGS, getCollectionAddressFromResult, itWeb3, normalizeEvents, recordEthFee, recordEvents, subToEth, transferBalanceToEth} from './util/helpers';
-import nonFungibleAbi from './nonFungibleAbi.json';
-import {expect} from 'chai';
-import {submitTransactionAsync} from '../substrate/substrate-api';
+import {itEth, usingEthPlaygrounds, expect, EthUniqueHelper} from './util/playgrounds';
+import {IKeyringPair} from '@polkadot/types/types';
+import {Contract} from 'web3-eth-contract';
 
 describe('NFT: Information getting', () => {
-  itWeb3('totalSupply', async ({api, web3, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'NFT'},
+  let donor: IKeyringPair;
+  let alice: IKeyringPair;
+
+  before(async function() {
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      donor = privateKey('//Alice');
+      [alice] = await helper.arrange.createAccounts([10n], donor);
     });
-    const alice = privateKeyWrapper('//Alice');
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
+  });
+  
+  itEth('totalSupply', async ({helper}) => {
+    const collection = await helper.nft.mintCollection(alice, {});
+    await collection.mintToken(alice);
 
-    await createItemExpectSuccess(alice, collection, 'NFT', {Substrate: alice.address});
+    const caller = await helper.eth.createAccountWithBalance(donor);
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(nonFungibleAbi as any, address, {from: caller, ...GAS_ARGS});
+    const contract = helper.ethNativeContract.collectionById(collection.collectionId, 'nft', caller);
     const totalSupply = await contract.methods.totalSupply().call();
 
     expect(totalSupply).to.equal('1');
   });
 
-  itWeb3('balanceOf', async ({api, web3, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'NFT'},
-    });
-    const alice = privateKeyWrapper('//Alice');
+  itEth('balanceOf', async ({helper}) => {
+    const collection = await helper.nft.mintCollection(alice, {});
+    const caller = await helper.eth.createAccountWithBalance(donor);
 
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    await createItemExpectSuccess(alice, collection, 'NFT', {Ethereum:caller});
-    await createItemExpectSuccess(alice, collection, 'NFT', {Ethereum: caller});
-    await createItemExpectSuccess(alice, collection, 'NFT', {Ethereum: caller});
+    await collection.mintToken(alice, {Ethereum: caller});
+    await collection.mintToken(alice, {Ethereum: caller});
+    await collection.mintToken(alice, {Ethereum: caller});
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(nonFungibleAbi as any, address, {from: caller, ...GAS_ARGS});
+    const contract = helper.ethNativeContract.collectionById(collection.collectionId, 'nft', caller);
     const balance = await contract.methods.balanceOf(caller).call();
 
     expect(balance).to.equal('3');
   });
 
-  itWeb3('ownerOf', async ({api, web3, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'NFT'},
-    });
-    const alice = privateKeyWrapper('//Alice');
+  itEth('ownerOf', async ({helper}) => {
+    const collection = await helper.nft.mintCollection(alice, {});
+    const caller = await helper.eth.createAccountWithBalance(donor);
 
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const tokenId = await createItemExpectSuccess(alice, collection, 'NFT', {Ethereum: caller});
+    const token = await collection.mintToken(alice, {Ethereum: caller});
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(nonFungibleAbi as any, address, {from: caller, ...GAS_ARGS});
-    const owner = await contract.methods.ownerOf(tokenId).call();
+    const contract = helper.ethNativeContract.collectionById(collection.collectionId, 'nft', caller);
+
+    const owner = await contract.methods.ownerOf(token.tokenId).call();
 
     expect(owner).to.equal(caller);
   });
 });
 
 describe('Check ERC721 token URI for NFT', () => {
-  itWeb3('Empty tokenURI', async ({web3, api, privateKeyWrapper}) => {
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, owner);
-    let result = await helper.methods.createERC721MetadataCompatibleCollection('Mint collection', '1', '1', '').send();
-    const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
-    const receiver = createEthAccount(web3);
-    const contract = evmCollection(web3, owner, collectionIdAddress);
+  let donor: IKeyringPair;
+
+  before(async function() {
+    await usingEthPlaygrounds(async (_helper, privateKey) => {
+      donor = privateKey('//Alice');
+    });
+  });
+
+  async function setup(helper: EthUniqueHelper, tokenPrefix: string, propertyKey?: string, propertyValue?: string): Promise<{contract: Contract, nextTokenId: string}> {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
+
+    const collectionHelper = helper.ethNativeContract.collectionHelpers(owner);
+    let result = await collectionHelper.methods.createERC721MetadataCompatibleCollection('Mint collection', 'a', 'b', tokenPrefix).send();
+    const collectionAddress = helper.ethAddress.normalizeAddress(result.events.CollectionCreated.returnValues.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'nft', owner);
     
     const nextTokenId = await contract.methods.nextTokenId().call();
     expect(nextTokenId).to.be.equal('1');
@@ -88,162 +94,73 @@
       nextTokenId,
     ).send();
 
-    const events = normalizeEvents(result.events);
-    const address = collectionIdToAddress(collectionId);
+    if (propertyKey && propertyValue) {
+      // Set URL or suffix
+      await contract.methods.setProperty(nextTokenId, propertyKey, Buffer.from(propertyValue)).send();
+    }
 
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: '0x0000000000000000000000000000000000000000',
-          to: receiver,
-          tokenId: nextTokenId,
-        },
-      },
-    ]);
+    const event = result.events.Transfer;
+    expect(event.address).to.be.equal(collectionAddress);
+    expect(event.returnValues.from).to.be.equal('0x0000000000000000000000000000000000000000');
+    expect(event.returnValues.to).to.be.equal(receiver);
+    expect(event.returnValues.tokenId).to.be.equal(nextTokenId);
 
+    return {contract, nextTokenId};
+  }
+
+  itEth('Empty tokenURI', async ({helper}) => {
+    const {contract, nextTokenId} = await setup(helper, '');
     expect(await contract.methods.tokenURI(nextTokenId).call()).to.be.equal('');
   });
 
-  itWeb3('TokenURI from url', async ({web3, api, privateKeyWrapper}) => {
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, owner);
-    let result = await helper.methods.createERC721MetadataCompatibleCollection('Mint collection', '1', '1', 'BaseURI_').send();
-    const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
-    const receiver = createEthAccount(web3);
-    const contract = evmCollection(web3, owner, collectionIdAddress);
-    
-    const nextTokenId = await contract.methods.nextTokenId().call();
-    expect(nextTokenId).to.be.equal('1');
-    result = await contract.methods.mint(
-      receiver,
-      nextTokenId,
-    ).send();
-    
-    // Set URL
-    await contract.methods.setProperty(nextTokenId, 'url', Buffer.from('Token URI')).send();
-      
-    const events = normalizeEvents(result.events);
-    const address = collectionIdToAddress(collectionId);
-
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: '0x0000000000000000000000000000000000000000',
-          to: receiver,
-          tokenId: nextTokenId,
-        },
-      },
-    ]);
-
+  itEth('TokenURI from url', async ({helper}) => {
+    const {contract, nextTokenId} = await setup(helper, 'BaseURI_', 'url', 'Token URI');
     expect(await contract.methods.tokenURI(nextTokenId).call()).to.be.equal('Token URI');
   });
 
-  itWeb3('TokenURI from baseURI + tokenId', async ({web3, api, privateKeyWrapper}) => {
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, owner);
-    let result = await helper.methods.createERC721MetadataCompatibleCollection('Mint collection', '1', '1', 'BaseURI_').send();
-    const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
-    const receiver = createEthAccount(web3);
-    const contract = evmCollection(web3, owner, collectionIdAddress);
-    
-    const nextTokenId = await contract.methods.nextTokenId().call();
-    expect(nextTokenId).to.be.equal('1');
-    result = await contract.methods.mint(
-      receiver,
-      nextTokenId,
-    ).send();
-          
-    const events = normalizeEvents(result.events);
-    const address = collectionIdToAddress(collectionId);
-
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: '0x0000000000000000000000000000000000000000',
-          to: receiver,
-          tokenId: nextTokenId,
-        },
-      },
-    ]);
-
+  itEth('TokenURI from baseURI + tokenId', async ({helper}) => {
+    const {contract, nextTokenId} = await setup(helper, 'BaseURI_');
     expect(await contract.methods.tokenURI(nextTokenId).call()).to.be.equal('BaseURI_' + nextTokenId);
   });
 
-  itWeb3('TokenURI from baseURI + suffix', async ({web3, api, privateKeyWrapper}) => {
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, owner);
-    let result = await helper.methods.createERC721MetadataCompatibleCollection('Mint collection', '1', '1', 'BaseURI_').send();
-    const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
-    const receiver = createEthAccount(web3);
-    const contract = evmCollection(web3, owner, collectionIdAddress);
-    
-    const nextTokenId = await contract.methods.nextTokenId().call();
-    expect(nextTokenId).to.be.equal('1');
-    result = await contract.methods.mint(
-      receiver,
-      nextTokenId,
-    ).send();
-          
-    // Set suffix
+  itEth('TokenURI from baseURI + suffix', async ({helper}) => {
     const suffix = '/some/suffix';
-    await contract.methods.setProperty(nextTokenId, 'suffix', Buffer.from(suffix)).send();
-
-    const events = normalizeEvents(result.events);
-    const address = collectionIdToAddress(collectionId);
-
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: '0x0000000000000000000000000000000000000000',
-          to: receiver,
-          tokenId: nextTokenId,
-        },
-      },
-    ]);
-
+    const {contract, nextTokenId} = await setup(helper, 'BaseURI_', 'suffix', suffix);
     expect(await contract.methods.tokenURI(nextTokenId).call()).to.be.equal('BaseURI_' + suffix);
   });
 });
 
 describe('NFT: Plain calls', () => {
-  itWeb3('Can perform mint()', async ({web3, api, privateKeyWrapper}) => {
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, owner);
-    let result = await helper.methods.createNonfungibleCollection('Mint collection', '6', '6').send();
-    const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
-    const receiver = createEthAccount(web3);
-    const contract = evmCollection(web3, owner, collectionIdAddress);
+  let donor: IKeyringPair;
+  let alice: IKeyringPair;
+
+  before(async function() {
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      donor = privateKey('//Alice');
+      [alice] = await helper.arrange.createAccounts([10n], donor);
+    });
+  });
+
+  itEth('Can perform mint()', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
+
+    const {collectionAddress} = await helper.eth.createNonfungibleCollection(owner, 'Minty', '6', '6');
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'nft', owner);
     const nextTokenId = await contract.methods.nextTokenId().call();
 
     expect(nextTokenId).to.be.equal('1');
-    result = await contract.methods.mintWithTokenURI(
+    const result = await contract.methods.mintWithTokenURI(
       receiver,
       nextTokenId,
       'Test URI',
     ).send();
 
-    const events = normalizeEvents(result.events);
-    const address = collectionIdToAddress(collectionId);
-
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: '0x0000000000000000000000000000000000000000',
-          to: receiver,
-          tokenId: nextTokenId,
-        },
-      },
-    ]);
+    const event = result.events.Transfer;
+    expect(event.address).to.be.equal(collectionAddress);
+    expect(event.returnValues.from).to.be.equal('0x0000000000000000000000000000000000000000');
+    expect(event.returnValues.to).to.be.equal(receiver);
+    expect(event.returnValues.tokenId).to.be.equal(nextTokenId);
 
     expect(await contract.methods.tokenURI(nextTokenId).call()).to.be.equal('Test URI');
 
@@ -254,7 +171,8 @@
   });
 
   //TODO: CORE-302 add eth methods
-  itWeb3.skip('Can perform mintBulk()', async ({web3, api, privateKeyWrapper}) => {
+  /* todo:playgrounds skipped test!
+  itWeb3.skip('Can perform mintBulk()', async ({helper}) => {
     const collection = await createCollectionExpectSuccess({
       mode: {type: 'NFT'},
     });
@@ -316,107 +234,70 @@
       expect(await contract.methods.tokenURI(+nextTokenId + 2).call()).to.be.equal('Test URI 2');
     }
   });
-
-  itWeb3('Can perform burn()', async ({web3, api, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'NFT'},
-    });
-    const alice = privateKeyWrapper('//Alice');
+  */
 
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
+  itEth('Can perform burn()', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
 
-    const tokenId = await createItemExpectSuccess(alice, collection, 'NFT', {Ethereum: owner});
+    const collection = await helper.nft.mintCollection(alice, {});
+    const {tokenId} = await collection.mintToken(alice, {Ethereum: caller});
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(nonFungibleAbi as any, address, {from: owner, ...GAS_ARGS});
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'nft', caller);
 
     {
-      const result = await contract.methods.burn(tokenId).send({from: owner});
-      const events = normalizeEvents(result.events);
-
-      expect(events).to.be.deep.equal([
-        {
-          address,
-          event: 'Transfer',
-          args: {
-            from: owner,
-            to: '0x0000000000000000000000000000000000000000',
-            tokenId: tokenId.toString(),
-          },
-        },
-      ]);
+      const result = await contract.methods.burn(tokenId).send({from: caller});
+      
+      const event = result.events.Transfer;
+      expect(event.address).to.be.equal(collectionAddress);
+      expect(event.returnValues.from).to.be.equal(caller);
+      expect(event.returnValues.to).to.be.equal('0x0000000000000000000000000000000000000000');
+      expect(event.returnValues.tokenId).to.be.equal(`${tokenId}`);
     }
   });
 
-  itWeb3('Can perform approve()', async ({web3, api, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'NFT'},
-    });
-    const alice = privateKeyWrapper('//Alice');
-
-    const owner = createEthAccount(web3);
-    await transferBalanceToEth(api, alice, owner);
-
-    const tokenId = await createItemExpectSuccess(alice, collection, 'NFT', {Ethereum: owner});
+  itEth('Can perform approve()', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const spender = helper.eth.createAccount();
 
-    const spender = createEthAccount(web3);
+    const collection = await helper.nft.mintCollection(alice, {});
+    const {tokenId} = await collection.mintToken(alice, {Ethereum: owner});
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(nonFungibleAbi as any, address);
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'nft', owner);
 
     {
-      const result = await contract.methods.approve(spender, tokenId).send({from: owner, ...GAS_ARGS});
-      const events = normalizeEvents(result.events);
+      const result = await contract.methods.approve(spender, tokenId).send({from: owner});
 
-      expect(events).to.be.deep.equal([
-        {
-          address,
-          event: 'Approval',
-          args: {
-            owner,
-            approved: spender,
-            tokenId: tokenId.toString(),
-          },
-        },
-      ]);
+      const event = result.events.Approval;
+      expect(event.address).to.be.equal(collectionAddress);
+      expect(event.returnValues.owner).to.be.equal(owner);
+      expect(event.returnValues.approved).to.be.equal(spender);
+      expect(event.returnValues.tokenId).to.be.equal(`${tokenId}`);
     }
   });
 
-  itWeb3('Can perform transferFrom()', async ({web3, api, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'NFT'},
-    });
-    const alice = privateKeyWrapper('//Alice');
-
-    const owner = createEthAccount(web3);
-    await transferBalanceToEth(api, alice, owner);
+  itEth('Can perform transferFrom()', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const spender = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
 
-    const tokenId = await createItemExpectSuccess(alice, collection, 'NFT', {Ethereum: owner});
-
-    const spender = createEthAccount(web3);
-    await transferBalanceToEth(api, alice, spender);
-
-    const receiver = createEthAccount(web3);
+    const collection = await helper.nft.mintCollection(alice, {});
+    const {tokenId} = await collection.mintToken(alice, {Ethereum: owner});
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(nonFungibleAbi as any, address, {from: owner, ...GAS_ARGS});
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'nft', owner);
 
     await contract.methods.approve(spender, tokenId).send({from: owner});
 
     {
       const result = await contract.methods.transferFrom(owner, receiver, tokenId).send({from: spender});
-      const events = normalizeEvents(result.events);
-      expect(events).to.be.deep.equal([
-        {
-          address,
-          event: 'Transfer',
-          args: {
-            from: owner,
-            to: receiver,
-            tokenId: tokenId.toString(),
-          },
-        },
-      ]);
+
+      const event = result.events.Transfer;
+      expect(event.address).to.be.equal(collectionAddress);
+      expect(event.returnValues.from).to.be.equal(owner);
+      expect(event.returnValues.to).to.be.equal(receiver);
+      expect(event.returnValues.tokenId).to.be.equal(`${tokenId}`);
     }
 
     {
@@ -430,37 +311,24 @@
     }
   });
 
-  itWeb3('Can perform transfer()', async ({web3, api, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'NFT'},
-    });
-    const alice = privateKeyWrapper('//Alice');
-
-    const owner = createEthAccount(web3);
-    await transferBalanceToEth(api, alice, owner);
-
-    const tokenId = await createItemExpectSuccess(alice, collection, 'NFT', {Ethereum: owner});
+  itEth('Can perform transfer()', async ({helper}) => {
+    const collection = await helper.nft.mintCollection(alice, {});
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
 
-    const receiver = createEthAccount(web3);
-    await transferBalanceToEth(api, alice, receiver);
+    const {tokenId} = await collection.mintToken(alice, {Ethereum: owner});
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(nonFungibleAbi as any, address, {from: owner, ...GAS_ARGS});
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'nft', owner);
 
     {
       const result = await contract.methods.transfer(receiver, tokenId).send({from: owner});
-      const events = normalizeEvents(result.events);
-      expect(events).to.be.deep.equal([
-        {
-          address,
-          event: 'Transfer',
-          args: {
-            from: owner,
-            to: receiver,
-            tokenId: tokenId.toString(),
-          },
-        },
-      ]);
+
+      const event = result.events.Transfer;
+      expect(event.address).to.be.equal(collectionAddress);
+      expect(event.returnValues.from).to.be.equal(owner);
+      expect(event.returnValues.to).to.be.equal(receiver);
+      expect(event.returnValues.tokenId).to.be.equal(`${tokenId}`);
     }
 
     {
@@ -476,237 +344,209 @@
 });
 
 describe('NFT: Fees', () => {
-  itWeb3('approve() call fee is less than 0.2UNQ', async ({web3, api, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'NFT'},
+  let donor: IKeyringPair;
+  let alice: IKeyringPair;
+
+  before(async function() {
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      donor = privateKey('//Alice');
+      [alice] = await helper.arrange.createAccounts([10n], donor);
     });
-    const alice = privateKeyWrapper('//Alice');
+  });
+  
+  itEth('approve() call fee is less than 0.2UNQ', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const spender = helper.eth.createAccount();
 
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const spender = createEthAccount(web3);
+    const collection = await helper.nft.mintCollection(alice, {});
+    const {tokenId} = await collection.mintToken(alice, {Ethereum: owner});
 
-    const tokenId = await createItemExpectSuccess(alice, collection, 'NFT', {Ethereum: owner});
+    const contract = helper.ethNativeContract.collectionById(collection.collectionId, 'nft', owner);
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(nonFungibleAbi as any, address, {from: owner, ...GAS_ARGS});
-
-    const cost = await recordEthFee(api, owner, () => contract.methods.approve(spender, tokenId).send({from: owner}));
-    expect(cost < BigInt(0.2 * Number(UNIQUE)));
+    const cost = await helper.eth.recordCallFee(owner, () => contract.methods.approve(spender, tokenId).send({from: owner}));
+    expect(cost < BigInt(0.2 * Number(helper.balance.getOneTokenNominal())));
   });
 
-  itWeb3('transferFrom() call fee is less than 0.2UNQ', async ({web3, api, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'NFT'},
-    });
-    const alice = privateKeyWrapper('//Alice');
-
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const spender = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
+  itEth('transferFrom() call fee is less than 0.2UNQ', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const spender = await helper.eth.createAccountWithBalance(donor);
 
-    const tokenId = await createItemExpectSuccess(alice, collection, 'NFT', {Ethereum: owner});
+    const collection = await helper.nft.mintCollection(alice, {});
+    const {tokenId} = await collection.mintToken(alice, {Ethereum: owner});
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(nonFungibleAbi as any, address, {from: owner, ...GAS_ARGS});
+    const contract = helper.ethNativeContract.collectionById(collection.collectionId, 'nft', owner);
 
     await contract.methods.approve(spender, tokenId).send({from: owner});
 
-    const cost = await recordEthFee(api, spender, () => contract.methods.transferFrom(owner, spender, tokenId).send({from: spender}));
-    expect(cost < BigInt(0.2 * Number(UNIQUE)));
+    const cost = await helper.eth.recordCallFee(spender, () => contract.methods.transferFrom(owner, spender, tokenId).send({from: spender}));
+    expect(cost < BigInt(0.2 * Number(helper.balance.getOneTokenNominal())));
   });
 
-  itWeb3('transfer() call fee is less than 0.2UNQ', async ({web3, api, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'NFT'},
-    });
-    const alice = privateKeyWrapper('//Alice');
+  itEth('transfer() call fee is less than 0.2UNQ', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
 
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const receiver = createEthAccount(web3);
+    const collection = await helper.nft.mintCollection(alice, {});
+    const {tokenId} = await collection.mintToken(alice, {Ethereum: owner});
 
-    const tokenId = await createItemExpectSuccess(alice, collection, 'NFT', {Ethereum: owner});
+    const contract = helper.ethNativeContract.collectionById(collection.collectionId, 'nft', owner);
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(nonFungibleAbi as any, address, {from: owner, ...GAS_ARGS});
-
-    const cost = await recordEthFee(api, owner, () => contract.methods.transfer(receiver, tokenId).send({from: owner}));
-    expect(cost < BigInt(0.2 * Number(UNIQUE)));
+    const cost = await helper.eth.recordCallFee(owner, () => contract.methods.transfer(receiver, tokenId).send({from: owner}));
+    expect(cost < BigInt(0.2 * Number(helper.balance.getOneTokenNominal())));
   });
 });
 
 describe('NFT: Substrate calls', () => {
-  itWeb3('Events emitted for mint()', async ({web3, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'NFT'},
+  let donor: IKeyringPair;
+  let alice: IKeyringPair;
+
+  before(async function() {
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      donor = privateKey('//Alice');
+      [alice] = await helper.arrange.createAccounts([20n], donor);
     });
-    const alice = privateKeyWrapper('//Alice');
+  });
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(nonFungibleAbi as any, address);
+  itEth('Events emitted for mint()', async ({helper}) => {
+    const collection = await helper.nft.mintCollection(alice, {});
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'nft');
 
-    let tokenId: number;
-    const events = await recordEvents(contract, async () => {
-      tokenId = await createItemExpectSuccess(alice, collection, 'NFT');
+    const events: any = [];
+    contract.events.allEvents((_: any, event: any) => {
+      events.push(event);
     });
+    const {tokenId} = await collection.mintToken(alice);
 
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: '0x0000000000000000000000000000000000000000',
-          to: subToEth(alice.address),
-          tokenId: tokenId!.toString(),
-        },
-      },
-    ]);
+    const event = events[0];
+    expect(event.event).to.be.equal('Transfer');
+    expect(event.address).to.be.equal(collectionAddress);
+    expect(event.returnValues.from).to.be.equal('0x0000000000000000000000000000000000000000');
+    expect(event.returnValues.to).to.be.equal(helper.address.substrateToEth(alice.address));
+    expect(event.returnValues.tokenId).to.be.equal(tokenId.toString());
   });
 
-  itWeb3('Events emitted for burn()', async ({web3, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'NFT'},
+  itEth('Events emitted for burn()', async ({helper}) => {
+    const collection = await helper.nft.mintCollection(alice, {});
+    const token = await collection.mintToken(alice);
+
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'nft');
+    
+    const events: any = [];
+    contract.events.allEvents((_: any, event: any) => {
+      events.push(event);
     });
-    const alice = privateKeyWrapper('//Alice');
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(nonFungibleAbi as any, address);
+    await token.burn(alice);
 
-    const tokenId = await createItemExpectSuccess(alice, collection, 'NFT');
-    const events = await recordEvents(contract, async () => {
-      await burnItemExpectSuccess(alice, collection, tokenId);
-    });
-
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: subToEth(alice.address),
-          to: '0x0000000000000000000000000000000000000000',
-          tokenId: tokenId.toString(),
-        },
-      },
-    ]);
+    const event = events[0];
+    expect(event.event).to.be.equal('Transfer');
+    expect(event.address).to.be.equal(collectionAddress);
+    expect(event.returnValues.from).to.be.equal(helper.address.substrateToEth(alice.address));
+    expect(event.returnValues.to).to.be.equal('0x0000000000000000000000000000000000000000');
+    expect(event.returnValues.tokenId).to.be.equal(token.tokenId.toString());
   });
 
-  itWeb3('Events emitted for approve()', async ({web3, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'NFT'},
-    });
-    const alice = privateKeyWrapper('//Alice');
+  itEth('Events emitted for approve()', async ({helper}) => {
+    const receiver = helper.eth.createAccount();
 
-    const receiver = createEthAccount(web3);
-
-    const tokenId = await createItemExpectSuccess(alice, collection, 'NFT');
-
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(nonFungibleAbi as any, address);
+    const collection = await helper.nft.mintCollection(alice, {});
+    const token = await collection.mintToken(alice);
 
-    const events = await recordEvents(contract, async () => {
-      await approveExpectSuccess(collection, tokenId, alice, {Ethereum: receiver}, 1);
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'nft');
+    
+    const events: any = [];
+    contract.events.allEvents((_: any, event: any) => {
+      events.push(event);
     });
 
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Approval',
-        args: {
-          owner: subToEth(alice.address),
-          approved: receiver,
-          tokenId: tokenId.toString(),
-        },
-      },
-    ]);
+    await token.approve(alice, {Ethereum: receiver});
+
+    const event = events[0];
+    expect(event.event).to.be.equal('Approval');
+    expect(event.address).to.be.equal(collectionAddress);
+    expect(event.returnValues.owner).to.be.equal(helper.address.substrateToEth(alice.address));
+    expect(event.returnValues.approved).to.be.equal(receiver);
+    expect(event.returnValues.tokenId).to.be.equal(token.tokenId.toString());
   });
 
-  itWeb3('Events emitted for transferFrom()', async ({web3, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'NFT'},
-    });
-    const alice = privateKeyWrapper('//Alice');
-    const bob = privateKeyWrapper('//Bob');
+  itEth('Events emitted for transferFrom()', async ({helper}) => {
+    const [bob] = await helper.arrange.createAccounts([10n], donor);
+    const receiver = helper.eth.createAccount();
 
-    const receiver = createEthAccount(web3);
-
-    const tokenId = await createItemExpectSuccess(alice, collection, 'NFT');
-    await approveExpectSuccess(collection, tokenId, alice, bob.address, 1);
-
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(nonFungibleAbi as any, address);
+    const collection = await helper.nft.mintCollection(alice, {});
+    const token = await collection.mintToken(alice);
+    await token.approve(alice, {Substrate: bob.address});
 
-    const events = await recordEvents(contract, async () => {
-      await transferFromExpectSuccess(collection, tokenId, bob, alice, {Ethereum: receiver}, 1, 'NFT');
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'nft');
+    
+    const events: any = [];
+    contract.events.allEvents((_: any, event: any) => {
+      events.push(event);
     });
 
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: subToEth(alice.address),
-          to: receiver,
-          tokenId: tokenId.toString(),
-        },
-      },
-    ]);
+    await token.transferFrom(bob, {Substrate: alice.address}, {Ethereum: receiver});
+    
+    const event = events[0];
+    expect(event.address).to.be.equal(collectionAddress);
+    expect(event.returnValues.from).to.be.equal(helper.address.substrateToEth(alice.address));
+    expect(event.returnValues.to).to.be.equal(receiver);
+    expect(event.returnValues.tokenId).to.be.equal(`${token.tokenId}`);
   });
 
-  itWeb3('Events emitted for transfer()', async ({web3, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      mode: {type: 'NFT'},
-    });
-    const alice = privateKeyWrapper('//Alice');
+  itEth('Events emitted for transfer()', async ({helper}) => {
+    const receiver = helper.eth.createAccount();
 
-    const receiver = createEthAccount(web3);
+    const collection = await helper.nft.mintCollection(alice, {});
+    const token = await collection.mintToken(alice);
 
-    const tokenId = await createItemExpectSuccess(alice, collection, 'NFT');
-
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(nonFungibleAbi as any, address);
-
-    const events = await recordEvents(contract, async () => {
-      await transferExpectSuccess(collection, tokenId, alice, {Ethereum: receiver}, 1, 'NFT');
+    const collectionAddress = helper.ethAddress.fromCollectionId(collection.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'nft');
+    
+    const events: any = [];
+    contract.events.allEvents((_: any, event: any) => {
+      events.push(event);
     });
 
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: subToEth(alice.address),
-          to: receiver,
-          tokenId: tokenId.toString(),
-        },
-      },
-    ]);
+    await token.transfer(alice, {Ethereum: receiver});
+    
+    const event = events[0];
+    expect(event.address).to.be.equal(collectionAddress);
+    expect(event.returnValues.from).to.be.equal(helper.address.substrateToEth(alice.address));
+    expect(event.returnValues.to).to.be.equal(receiver);
+    expect(event.returnValues.tokenId).to.be.equal(`${token.tokenId}`);
   });
 });
 
 describe('Common metadata', () => {
-  itWeb3('Returns collection name', async ({api, web3, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      name: 'token name',
-      mode: {type: 'NFT'},
+  let donor: IKeyringPair;
+  let alice: IKeyringPair;
+
+  before(async function() {
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      donor = privateKey('//Alice');
+      [alice] = await helper.arrange.createAccounts([20n], donor);
     });
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
+  });
+
+  itEth('Returns collection name', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const collection = await helper.nft.mintCollection(alice, {name: 'oh River', tokenPrefix: 'CHANGE'});
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(nonFungibleAbi as any, address, {from: caller, ...GAS_ARGS});
+    const contract = helper.ethNativeContract.collectionById(collection.collectionId, 'nft', caller);
     const name = await contract.methods.name().call();
-
-    expect(name).to.equal('token name');
+    expect(name).to.equal('oh River');
   });
 
-  itWeb3('Returns symbol name', async ({api, web3, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      tokenPrefix: 'TOK',
-      mode: {type: 'NFT'},
-    });
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
+  itEth('Returns symbol name', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const collection = await helper.nft.mintCollection(alice, {name: 'oh River', tokenPrefix: 'CHANGE'});
 
-    const address = collectionIdToAddress(collection);
-    const contract = new web3.eth.Contract(nonFungibleAbi as any, address, {from: caller, ...GAS_ARGS});
+    const contract = helper.ethNativeContract.collectionById(collection.collectionId, 'nft', caller);
     const symbol = await contract.methods.symbol().call();
-
-    expect(symbol).to.equal('TOK');
+    expect(symbol).to.equal('CHANGE');
   });
 });
\ No newline at end of file

--- a/tests/src/eth/nonFungibleAbi.json
+++ b/tests/src/eth/nonFungibleAbi.json
@@ -91,27 +91,9 @@
   },
   {
     "inputs": [
-      { "internalType": "uint256", "name": "newAdmin", "type": "uint256" }
-    ],
-    "name": "addCollectionAdminSubstrate",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
       { "internalType": "address", "name": "user", "type": "address" }
     ],
     "name": "addToCollectionAllowList",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      { "internalType": "uint256", "name": "user", "type": "uint256" }
-    ],
-    "name": "addToCollectionAllowListSubstrate",
     "outputs": [],
     "stateMutability": "nonpayable",
     "type": "function"
@@ -273,15 +255,6 @@
       { "internalType": "address", "name": "user", "type": "address" }
     ],
     "name": "isOwnerOrAdmin",
-    "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
-    "stateMutability": "view",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      { "internalType": "uint256", "name": "user", "type": "uint256" }
-    ],
-    "name": "isOwnerOrAdminSubstrate",
     "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
     "stateMutability": "view",
     "type": "function"
@@ -385,15 +358,6 @@
     "type": "function"
   },
   {
-    "inputs": [
-      { "internalType": "uint256", "name": "admin", "type": "uint256" }
-    ],
-    "name": "removeCollectionAdminSubstrate",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
     "inputs": [],
     "name": "removeCollectionSponsor",
     "outputs": [],
@@ -405,15 +369,6 @@
       { "internalType": "address", "name": "user", "type": "address" }
     ],
     "name": "removeFromCollectionAllowList",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      { "internalType": "uint256", "name": "user", "type": "uint256" }
-    ],
-    "name": "removeFromCollectionAllowListSubstrate",
     "outputs": [],
     "stateMutability": "nonpayable",
     "type": "function"
@@ -527,27 +482,9 @@
   },
   {
     "inputs": [
-      { "internalType": "uint256", "name": "sponsor", "type": "uint256" }
-    ],
-    "name": "setCollectionSponsorSubstrate",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
       { "internalType": "address", "name": "newOwner", "type": "address" }
     ],
     "name": "setOwner",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      { "internalType": "uint256", "name": "newOwner", "type": "uint256" }
-    ],
-    "name": "setOwnerSubstrate",
     "outputs": [],
     "stateMutability": "nonpayable",
     "type": "function"

--- a/tests/src/eth/payable.test.ts
+++ b/tests/src/eth/payable.test.ts
@@ -50,7 +50,7 @@
     await helper.eth.transferBalanceFromSubstrate(alice, helper.address.substrateToEth(alice.address), 5n);
 
 
-    await helper.eth.callEVM(alice, contract.options.address, contract.methods.giveMoney().encodeABI(), weiCount);
+    await helper.eth.sendEVM(alice, contract.options.address, contract.methods.giveMoney().encodeABI(), weiCount);
 
     expect(await contract.methods.getCollected().call()).to.be.equal(weiCount);
   });

--- a/tests/src/eth/reFungible.test.ts
+++ b/tests/src/eth/reFungible.test.ts
@@ -14,33 +14,35 @@
 // You should have received a copy of the GNU General Public License
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
-import {createCollectionExpectSuccess, UNIQUE, requirePallets, Pallets} from '../util/helpers';
-import {collectionIdToAddress, createEthAccount, createEthAccountWithBalance, evmCollection, evmCollectionHelpers, getCollectionAddressFromResult, itWeb3, normalizeEvents, recordEthFee, recordEvents, tokenIdToAddress, uniqueRefungibleToken} from './util/helpers';
-import {expect} from 'chai';
+import {Pallets, requirePalletsOrSkip} from '../util/playgrounds';
+import {expect, itEth, usingEthPlaygrounds} from './util/playgrounds';
+import {IKeyringPair} from '@polkadot/types/types';
 
 describe('Refungible: Information getting', () => {
+  let donor: IKeyringPair;
+
   before(async function() {
-    await requirePallets(this, [Pallets.ReFungible]);
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      requirePalletsOrSkip(this, helper, [Pallets.ReFungible]);
+
+      donor = privateKey('//Alice');
+    });
   });
 
-  itWeb3('totalSupply', async ({api, web3, privateKeyWrapper}) => {
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, caller);
-    const result = await helper.methods.createRFTCollection('Mint collection', '6', '6').send();
-    const {collectionIdAddress} = await getCollectionAddressFromResult(api, result);
-    const contract = evmCollection(web3, caller, collectionIdAddress, {type: 'ReFungible'});
+  itEth('totalSupply', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const {collectionAddress} = await helper.eth.createRefungibleCollection(caller, 'TotalSupply', '6', '6');
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'rft', caller);
     const nextTokenId = await contract.methods.nextTokenId().call();
     await contract.methods.mint(caller, nextTokenId).send();
     const totalSupply = await contract.methods.totalSupply().call();
     expect(totalSupply).to.equal('1');
   });
 
-  itWeb3('balanceOf', async ({api, web3, privateKeyWrapper}) => {
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, caller);
-    const result = await helper.methods.createRFTCollection('Mint collection', '6', '6').send();
-    const {collectionIdAddress} = await getCollectionAddressFromResult(api, result);
-    const contract = evmCollection(web3, caller, collectionIdAddress, {type: 'ReFungible'});
+  itEth('balanceOf', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const {collectionAddress} = await helper.eth.createRefungibleCollection(caller, 'BalanceOf', '6', '6');
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'rft', caller);
 
     {
       const nextTokenId = await contract.methods.nextTokenId().call();
@@ -56,38 +58,30 @@
     }
 
     const balance = await contract.methods.balanceOf(caller).call();
-
     expect(balance).to.equal('3');
   });
 
-  itWeb3('ownerOf', async ({api, web3, privateKeyWrapper}) => {
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, caller);
-    const result = await helper.methods.createRFTCollection('Mint collection', '6', '6').send();
-    const {collectionIdAddress} = await getCollectionAddressFromResult(api, result);
-    const contract = evmCollection(web3, caller, collectionIdAddress, {type: 'ReFungible'});
+  itEth('ownerOf', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const {collectionAddress} = await helper.eth.createRefungibleCollection(caller, 'OwnerOf', '6', '6');
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'rft', caller);
 
     const tokenId = await contract.methods.nextTokenId().call();
     await contract.methods.mint(caller, tokenId).send();
 
     const owner = await contract.methods.ownerOf(tokenId).call();
-
     expect(owner).to.equal(caller);
   });
 
-  itWeb3('ownerOf after burn', async ({api, web3, privateKeyWrapper}) => {
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const receiver = createEthAccount(web3);
-    const helper = evmCollectionHelpers(web3, caller);
-    const result = await helper.methods.createRFTCollection('Mint collection', '6', '6').send();
-    const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
-    const contract = evmCollection(web3, caller, collectionIdAddress, {type: 'ReFungible'});
+  itEth('ownerOf after burn', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
+    const {collectionId, collectionAddress} = await helper.eth.createRefungibleCollection(caller, 'OwnerOf-AfterBurn', '6', '6');
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'rft', caller);
 
     const tokenId = await contract.methods.nextTokenId().call();
     await contract.methods.mint(caller, tokenId).send();
-
-    const tokenAddress = tokenIdToAddress(collectionId, tokenId);
-    const tokenContract = uniqueRefungibleToken(web3, tokenAddress, caller);
+    const tokenContract = helper.ethNativeContract.rftTokenById(collectionId, tokenId, caller);
 
     await tokenContract.methods.repartition(2).send();
     await tokenContract.methods.transfer(receiver, 1).send();
@@ -95,80 +89,67 @@
     await tokenContract.methods.burnFrom(caller, 1).send();
 
     const owner = await contract.methods.ownerOf(tokenId).call();
-
     expect(owner).to.equal(receiver);
   });
 
-  itWeb3('ownerOf for partial ownership', async ({api, web3, privateKeyWrapper}) => {
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const receiver = createEthAccount(web3);
-    const helper = evmCollectionHelpers(web3, caller);
-    const result = await helper.methods.createRFTCollection('Mint collection', '6', '6').send();
-    const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
-    const contract = evmCollection(web3, caller, collectionIdAddress, {type: 'ReFungible'});
+  itEth('ownerOf for partial ownership', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
+    const {collectionId, collectionAddress} = await helper.eth.createRefungibleCollection(caller, 'Partial-OwnerOf', '6', '6');
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'rft', caller);
 
     const tokenId = await contract.methods.nextTokenId().call();
     await contract.methods.mint(caller, tokenId).send();
-
-    const tokenAddress = tokenIdToAddress(collectionId, tokenId);
-    const tokenContract = uniqueRefungibleToken(web3, tokenAddress, caller);
+    const tokenContract = helper.ethNativeContract.rftTokenById(collectionId, tokenId, caller);
 
     await tokenContract.methods.repartition(2).send();
     await tokenContract.methods.transfer(receiver, 1).send();
 
     const owner = await contract.methods.ownerOf(tokenId).call();
-
     expect(owner).to.equal('0xFFfFfFffFFfffFFfFFfFFFFFffFFFffffFfFFFfF');
   });
 });
 
 describe('Refungible: Plain calls', () => {
+  let donor: IKeyringPair;
+
   before(async function() {
-    await requirePallets(this, [Pallets.ReFungible]);
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      requirePalletsOrSkip(this, helper, [Pallets.ReFungible]);
+
+      donor = privateKey('//Alice');
+    });
   });
 
-  itWeb3('Can perform mint()', async ({web3, api, privateKeyWrapper}) => {
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, owner);
-    let result = await helper.methods.createRFTCollection('Mint collection', '6', '6').send();
-    const {collectionIdAddress} = await getCollectionAddressFromResult(api, result);
-    const receiver = createEthAccount(web3);
-    const contract = evmCollection(web3, owner, collectionIdAddress, {type: 'ReFungible'});
+  itEth('Can perform mint()', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
+    const {collectionAddress} = await helper.eth.createRefungibleCollection(owner, 'Minty', '6', '6');
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'rft', owner);
+    
     const nextTokenId = await contract.methods.nextTokenId().call();
-
     expect(nextTokenId).to.be.equal('1');
-    result = await contract.methods.mintWithTokenURI(
+    const result = await contract.methods.mintWithTokenURI(
       receiver,
       nextTokenId,
       'Test URI',
     ).send();
 
-    const events = normalizeEvents(result.events);
-
-    expect(events).to.include.deep.members([
-      {
-        address: collectionIdAddress,
-        event: 'Transfer',
-        args: {
-          from: '0x0000000000000000000000000000000000000000',
-          to: receiver,
-          tokenId: nextTokenId,
-        },
-      },
-    ]);
+    const event = result.events.Transfer;
+    expect(event.address).to.equal(collectionAddress);
+    expect(event.returnValues.from).to.equal('0x0000000000000000000000000000000000000000');
+    expect(event.returnValues.to).to.equal(receiver);
+    expect(event.returnValues.tokenId).to.equal(nextTokenId);
 
     expect(await contract.methods.tokenURI(nextTokenId).call()).to.be.equal('Test URI');
   });
 
-  itWeb3('Can perform mintBulk()', async ({web3, api, privateKeyWrapper}) => {
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, caller);
-    const result = await helper.methods.createRFTCollection('Mint collection', '6', '6').send();
-    const {collectionIdAddress} = await getCollectionAddressFromResult(api, result);
-    const contract = evmCollection(web3, caller, collectionIdAddress, {type: 'ReFungible'});
+  itEth('Can perform mintBulk()', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
+    const {collectionAddress} = await helper.eth.createRefungibleCollection(owner, 'MintBulky', '6', '6');
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'rft', owner);
 
-    const receiver = createEthAccount(web3);
-
     {
       const nextTokenId = await contract.methods.nextTokenId().call();
       expect(nextTokenId).to.be.equal('1');
@@ -180,37 +161,15 @@
           [+nextTokenId + 2, 'Test URI 2'],
         ],
       ).send();
-      const events = normalizeEvents(result.events);
 
-      expect(events).to.include.deep.members([
-        {
-          address: collectionIdAddress,
-          event: 'Transfer',
-          args: {
-            from: '0x0000000000000000000000000000000000000000',
-            to: receiver,
-            tokenId: nextTokenId,
-          },
-        },
-        {
-          address: collectionIdAddress,
-          event: 'Transfer',
-          args: {
-            from: '0x0000000000000000000000000000000000000000',
-            to: receiver,
-            tokenId: String(+nextTokenId + 1),
-          },
-        },
-        {
-          address: collectionIdAddress,
-          event: 'Transfer',
-          args: {
-            from: '0x0000000000000000000000000000000000000000',
-            to: receiver,
-            tokenId: String(+nextTokenId + 2),
-          },
-        },
-      ]);
+      const events = result.events.Transfer;
+      for (let i = 0; i < 2; i++) {
+        const event = events[i];
+        expect(event.address).to.equal(collectionAddress);
+        expect(event.returnValues.from).to.equal('0x0000000000000000000000000000000000000000');
+        expect(event.returnValues.to).to.equal(receiver);
+        expect(event.returnValues.tokenId).to.equal(String(+nextTokenId + i));
+      }
 
       expect(await contract.methods.tokenURI(nextTokenId).call()).to.be.equal('Test URI 0');
       expect(await contract.methods.tokenURI(+nextTokenId + 1).call()).to.be.equal('Test URI 1');
@@ -218,76 +177,54 @@
     }
   });
 
-  itWeb3('Can perform burn()', async ({web3, api, privateKeyWrapper}) => {
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, caller);
-    const result = await helper.methods.createRFTCollection('Mint collection', '6', '6').send();
-    const {collectionIdAddress} = await getCollectionAddressFromResult(api, result);
-    const contract = evmCollection(web3, caller, collectionIdAddress, {type: 'ReFungible'});
+  itEth('Can perform burn()', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const {collectionAddress} = await helper.eth.createRefungibleCollection(caller, 'Burny', '6', '6');
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'rft', caller);
 
     const tokenId = await contract.methods.nextTokenId().call();
     await contract.methods.mint(caller, tokenId).send();
     {
       const result = await contract.methods.burn(tokenId).send();
-      const events = normalizeEvents(result.events);
-      expect(events).to.include.deep.members([
-        {
-          address: collectionIdAddress,
-          event: 'Transfer',
-          args: {
-            from: caller,
-            to: '0x0000000000000000000000000000000000000000',
-            tokenId: tokenId.toString(),
-          },
-        },
-      ]);
+      const event = result.events.Transfer;
+      expect(event.address).to.equal(collectionAddress);
+      expect(event.returnValues.from).to.equal(caller);
+      expect(event.returnValues.to).to.equal('0x0000000000000000000000000000000000000000');
+      expect(event.returnValues.tokenId).to.equal(tokenId.toString());
     }
   });
 
-  itWeb3('Can perform transferFrom()', async ({web3, api, privateKeyWrapper}) => {
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, caller);
-    const result = await helper.methods.createRFTCollection('Mint collection', '6', '6').send();
-    const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
-    const contract = evmCollection(web3, caller, collectionIdAddress, {type: 'ReFungible'});
-
-    const receiver = createEthAccount(web3);
+  itEth('Can perform transferFrom()', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
+    const {collectionId, collectionAddress} = await helper.eth.createRefungibleCollection(caller, 'TransferFromy', '6', '6');
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'rft', caller);
 
     const tokenId = await contract.methods.nextTokenId().call();
+    const tokenAddress = helper.ethAddress.fromTokenId(collectionId, tokenId);
     await contract.methods.mint(caller, tokenId).send();
 
-    const address = tokenIdToAddress(collectionId, tokenId);
-    const tokenContract = uniqueRefungibleToken(web3, address, caller);
+    const tokenContract = helper.ethNativeContract.rftToken(tokenAddress, caller);
     await tokenContract.methods.repartition(15).send();
 
     {
-      const erc20Events = await recordEvents(tokenContract, async () => {
-        const result = await contract.methods.transferFrom(caller, receiver, tokenId).send();
-        const events = normalizeEvents(result.events);
-        expect(events).to.include.deep.members([
-          {
-            address: collectionIdAddress,
-            event: 'Transfer',
-            args: {
-              from: caller,
-              to: receiver,
-              tokenId: tokenId.toString(),
-            },
-          },
-        ]);
+      const tokenEvents: any = [];
+      tokenContract.events.allEvents((_: any, event: any) => {
+        tokenEvents.push(event);
       });
+      const result = await contract.methods.transferFrom(caller, receiver, tokenId).send();
+
+      let event = result.events.Transfer;
+      expect(event.address).to.equal(collectionAddress);
+      expect(event.returnValues.from).to.equal(caller);
+      expect(event.returnValues.to).to.equal(receiver);
+      expect(event.returnValues.tokenId).to.equal(tokenId.toString());
 
-      expect(erc20Events).to.include.deep.members([
-        {
-          address,
-          event: 'Transfer',
-          args: {
-            from: caller,
-            to: receiver,
-            value: '15',
-          },
-        },
-      ]);
+      event = tokenEvents[0];
+      expect(event.address).to.equal(tokenAddress);
+      expect(event.returnValues.from).to.equal(caller);
+      expect(event.returnValues.to).to.equal(receiver);
+      expect(event.returnValues.value).to.equal('15');
     }
 
     {
@@ -301,32 +238,23 @@
     }
   });
 
-  itWeb3('Can perform transfer()', async ({web3, api, privateKeyWrapper}) => {
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, caller);
-    const result = await helper.methods.createRFTCollection('Mint collection', '6', '6').send();
-    const {collectionIdAddress} = await getCollectionAddressFromResult(api, result);
-    const contract = evmCollection(web3, caller, collectionIdAddress, {type: 'ReFungible'});
-
-    const receiver = createEthAccount(web3);
+  itEth('Can perform transfer()', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
+    const {collectionAddress} = await helper.eth.createRefungibleCollection(caller, 'Transferry', '6', '6');
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'rft', caller);
 
     const tokenId = await contract.methods.nextTokenId().call();
     await contract.methods.mint(caller, tokenId).send();
 
     {
       const result = await contract.methods.transfer(receiver, tokenId).send();
-      const events = normalizeEvents(result.events);
-      expect(events).to.include.deep.members([
-        {
-          address: collectionIdAddress,
-          event: 'Transfer',
-          args: {
-            from: caller,
-            to: receiver,
-            tokenId: tokenId.toString(),
-          },
-        },
-      ]);
+      
+      const event = result.events.Transfer;
+      expect(event.address).to.equal(collectionAddress);
+      expect(event.returnValues.from).to.equal(caller);
+      expect(event.returnValues.to).to.equal(receiver);
+      expect(event.returnValues.tokenId).to.equal(tokenId.toString());
     }
 
     {
@@ -340,141 +268,127 @@
     }
   });
 
-  itWeb3('transfer event on transfer from partial ownership to full ownership', async ({api, web3, privateKeyWrapper}) => {
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const receiver = createEthAccount(web3);
-    const helper = evmCollectionHelpers(web3, caller);
-    const result = await helper.methods.createRFTCollection('Mint collection', '6', '6').send();
-    const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
-    const contract = evmCollection(web3, caller, collectionIdAddress, {type: 'ReFungible'});
+  itEth('transfer event on transfer from partial ownership to full ownership', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
+    const {collectionId, collectionAddress} = await helper.eth.createRefungibleCollection(caller, 'Transferry-Partial-to-Full', '6', '6');
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'rft', caller);
 
     const tokenId = await contract.methods.nextTokenId().call();
     await contract.methods.mint(caller, tokenId).send();
 
-    const tokenAddress = tokenIdToAddress(collectionId, tokenId);
-    const tokenContract = uniqueRefungibleToken(web3, tokenAddress, caller);
+    const tokenContract = helper.ethNativeContract.rftTokenById(collectionId, tokenId, caller);
 
     await tokenContract.methods.repartition(2).send();
     await tokenContract.methods.transfer(receiver, 1).send();
 
-    const events =  await recordEvents(contract, async () =>
-      await tokenContract.methods.transfer(receiver, 1).send());
-    expect(events).to.deep.equal([
-      {
-        address: collectionIdAddress,
-        event: 'Transfer',
-        args: {
-          from: '0xFFfFfFffFFfffFFfFFfFFFFFffFFFffffFfFFFfF',
-          to: receiver,
-          tokenId: tokenId.toString(),
-        },
-      },
-    ]);
+    const events: any = [];
+    contract.events.allEvents((_: any, event: any) => {
+      events.push(event);
+    });
+    await tokenContract.methods.transfer(receiver, 1).send();
+
+    const event = events[0];
+    expect(event.address).to.equal(collectionAddress);
+    expect(event.returnValues.from).to.equal('0xFFfFfFffFFfffFFfFFfFFFFFffFFFffffFfFFFfF');
+    expect(event.returnValues.to).to.equal(receiver);
+    expect(event.returnValues.tokenId).to.equal(tokenId.toString());
   });
 
-  itWeb3('transfer event on transfer from full ownership to partial ownership', async ({api, web3, privateKeyWrapper}) => {
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const receiver = createEthAccount(web3);
-    const helper = evmCollectionHelpers(web3, caller);
-    const result = await helper.methods.createRFTCollection('Mint collection', '6', '6').send();
-    const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
-    const contract = evmCollection(web3, caller, collectionIdAddress, {type: 'ReFungible'});
+  itEth('transfer event on transfer from full ownership to partial ownership', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
+    const {collectionId, collectionAddress} = await helper.eth.createRefungibleCollection(caller, 'Transferry-Full-to-Partial', '6', '6');
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'rft', caller);
 
     const tokenId = await contract.methods.nextTokenId().call();
     await contract.methods.mint(caller, tokenId).send();
 
-    const tokenAddress = tokenIdToAddress(collectionId, tokenId);
-    const tokenContract = uniqueRefungibleToken(web3, tokenAddress, caller);
+    const tokenContract = helper.ethNativeContract.rftTokenById(collectionId, tokenId, caller);
 
     await tokenContract.methods.repartition(2).send();
 
-    const events =  await recordEvents(contract, async () =>
-      await tokenContract.methods.transfer(receiver, 1).send());
+    const events: any = [];
+    contract.events.allEvents((_: any, event: any) => {
+      events.push(event);
+    });
+    await tokenContract.methods.transfer(receiver, 1).send();
 
-    expect(events).to.deep.equal([
-      {
-        address: collectionIdAddress,
-        event: 'Transfer',
-        args: {
-          from: caller,
-          to: '0xFFfFfFffFFfffFFfFFfFFFFFffFFFffffFfFFFfF',
-          tokenId: tokenId.toString(),
-        },
-      },
-    ]);
+    const event = events[0];
+    expect(event.address).to.equal(collectionAddress);
+    expect(event.returnValues.from).to.equal(caller);
+    expect(event.returnValues.to).to.equal('0xFFfFfFffFFfffFFfFFfFFFFFffFFFffffFfFFFfF');
+    expect(event.returnValues.tokenId).to.equal(tokenId.toString());
   });
 });
 
 describe('RFT: Fees', () => {
+  let donor: IKeyringPair;
+
   before(async function() {
-    await requirePallets(this, [Pallets.ReFungible]);
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      requirePalletsOrSkip(this, helper, [Pallets.ReFungible]);
+
+      donor = privateKey('//Alice');
+    });
   });
 
-  itWeb3('transferFrom() call fee is less than 0.2UNQ', async ({web3, api, privateKeyWrapper}) => {
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, caller);
-    const result = await helper.methods.createRFTCollection('Mint collection', '6', '6').send();
-    const {collectionIdAddress} = await getCollectionAddressFromResult(api, result);
-    const contract = evmCollection(web3, caller, collectionIdAddress, {type: 'ReFungible'});
-
-    const receiver = createEthAccount(web3);
+  itEth('transferFrom() call fee is less than 0.2UNQ', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
+    const {collectionAddress} = await helper.eth.createRefungibleCollection(caller, 'Feeful-Transfer-From', '6', '6');
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'rft', caller);
 
     const tokenId = await contract.methods.nextTokenId().call();
     await contract.methods.mint(caller, tokenId).send();
 
-    const cost = await recordEthFee(api, caller, () => contract.methods.transferFrom(caller, receiver, tokenId).send());
-    expect(cost < BigInt(0.2 * Number(UNIQUE)));
+    const cost = await helper.eth.recordCallFee(caller, () => contract.methods.transferFrom(caller, receiver, tokenId).send());
+    expect(cost < BigInt(0.2 * Number(helper.balance.getOneTokenNominal())));
     expect(cost > 0n);
   });
 
-  itWeb3('transfer() call fee is less than 0.2UNQ', async ({web3, api, privateKeyWrapper}) => {
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, caller);
-    const result = await helper.methods.createRFTCollection('Mint collection', '6', '6').send();
-    const {collectionIdAddress} = await getCollectionAddressFromResult(api, result);
-    const contract = evmCollection(web3, caller, collectionIdAddress, {type: 'ReFungible'});
-
-    const receiver = createEthAccount(web3);
+  itEth('transfer() call fee is less than 0.2UNQ', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
+    const {collectionAddress} = await helper.eth.createRefungibleCollection(caller, 'Feeful-Transfer', '6', '6');
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'rft', caller);
 
     const tokenId = await contract.methods.nextTokenId().call();
     await contract.methods.mint(caller, tokenId).send();
 
-    const cost = await recordEthFee(api, caller, () => contract.methods.transfer(receiver, tokenId).send());
-    expect(cost < BigInt(0.2 * Number(UNIQUE)));
+    const cost = await helper.eth.recordCallFee(caller, () => contract.methods.transfer(receiver, tokenId).send());
+    expect(cost < BigInt(0.2 * Number(helper.balance.getOneTokenNominal())));
     expect(cost > 0n);
   });
 });
 
 describe('Common metadata', () => {
+  let donor: IKeyringPair;
+  let alice: IKeyringPair;
+
   before(async function() {
-    await requirePallets(this, [Pallets.ReFungible]);
-  });
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      requirePalletsOrSkip(this, helper, [Pallets.ReFungible]);
 
-  itWeb3('Returns collection name', async ({api, web3, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      name: 'token name',
-      mode: {type: 'ReFungible'},
+      donor = privateKey('//Alice');
+      [alice] = await helper.arrange.createAccounts([20n], donor);
     });
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
+  });
 
-    const address = collectionIdToAddress(collection);
-    const contract = evmCollection(web3, caller, address, {type: 'ReFungible'});
+  itEth('Returns collection name', async ({helper}) => {
+    const caller = helper.eth.createAccount();
+    const collection = await helper.rft.mintCollection(alice, {name: 'Leviathan', tokenPrefix: '11'});
+    
+    const contract = helper.ethNativeContract.collectionById(collection.collectionId, 'rft', caller);
     const name = await contract.methods.name().call();
-
-    expect(name).to.equal('token name');
+    expect(name).to.equal('Leviathan');
   });
 
-  itWeb3('Returns symbol name', async ({api, web3, privateKeyWrapper}) => {
-    const collection = await createCollectionExpectSuccess({
-      tokenPrefix: 'TOK',
-      mode: {type: 'ReFungible'},
-    });
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-
-    const address = collectionIdToAddress(collection);
-    const contract = evmCollection(web3, caller, address, {type: 'ReFungible'});
+  itEth('Returns symbol name', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const {collectionAddress} = await helper.eth.createRefungibleCollection(caller, 'Leviathan', '', '12');
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'rft', caller);
     const symbol = await contract.methods.symbol().call();
-
-    expect(symbol).to.equal('TOK');
+    expect(symbol).to.equal('12');
   });
 });

--- a/tests/src/eth/reFungibleAbi.json
+++ b/tests/src/eth/reFungibleAbi.json
@@ -91,27 +91,9 @@
   },
   {
     "inputs": [
-      { "internalType": "uint256", "name": "newAdmin", "type": "uint256" }
-    ],
-    "name": "addCollectionAdminSubstrate",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
       { "internalType": "address", "name": "user", "type": "address" }
     ],
     "name": "addToCollectionAllowList",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      { "internalType": "uint256", "name": "user", "type": "uint256" }
-    ],
-    "name": "addToCollectionAllowListSubstrate",
     "outputs": [],
     "stateMutability": "nonpayable",
     "type": "function"
@@ -273,15 +255,6 @@
       { "internalType": "address", "name": "user", "type": "address" }
     ],
     "name": "isOwnerOrAdmin",
-    "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
-    "stateMutability": "view",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      { "internalType": "uint256", "name": "user", "type": "uint256" }
-    ],
-    "name": "isOwnerOrAdminSubstrate",
     "outputs": [{ "internalType": "bool", "name": "", "type": "bool" }],
     "stateMutability": "view",
     "type": "function"
@@ -385,15 +358,6 @@
     "type": "function"
   },
   {
-    "inputs": [
-      { "internalType": "uint256", "name": "admin", "type": "uint256" }
-    ],
-    "name": "removeCollectionAdminSubstrate",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
     "inputs": [],
     "name": "removeCollectionSponsor",
     "outputs": [],
@@ -405,15 +369,6 @@
       { "internalType": "address", "name": "user", "type": "address" }
     ],
     "name": "removeFromCollectionAllowList",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      { "internalType": "uint256", "name": "user", "type": "uint256" }
-    ],
-    "name": "removeFromCollectionAllowListSubstrate",
     "outputs": [],
     "stateMutability": "nonpayable",
     "type": "function"
@@ -527,27 +482,9 @@
   },
   {
     "inputs": [
-      { "internalType": "uint256", "name": "sponsor", "type": "uint256" }
-    ],
-    "name": "setCollectionSponsorSubstrate",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
       { "internalType": "address", "name": "newOwner", "type": "address" }
     ],
     "name": "setOwner",
-    "outputs": [],
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "inputs": [
-      { "internalType": "uint256", "name": "newOwner", "type": "uint256" }
-    ],
-    "name": "setOwnerSubstrate",
     "outputs": [],
     "stateMutability": "nonpayable",
     "type": "function"

--- a/tests/src/eth/reFungibleToken.test.ts
+++ b/tests/src/eth/reFungibleToken.test.ts
@@ -14,82 +14,76 @@
 // You should have received a copy of the GNU General Public License
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
-import {approve, createCollection, createRefungibleToken, transfer, transferFrom, UNIQUE, requirePallets, Pallets} from '../util/helpers';
-import {collectionIdToAddress, createEthAccount, createEthAccountWithBalance, createRFTCollection, evmCollection, evmCollectionHelpers, getCollectionAddressFromResult, itWeb3, normalizeEvents, recordEthFee, recordEvents, subToEth, tokenIdToAddress, transferBalanceToEth, uniqueRefungible, uniqueRefungibleToken} from './util/helpers';
+import {Pallets, requirePalletsOrSkip} from '../util/playgrounds';
+import {EthUniqueHelper, expect, itEth, usingEthPlaygrounds} from './util/playgrounds';
+import {IKeyringPair} from '@polkadot/types/types';
+import {Contract} from 'web3-eth-contract';
 
-import chai from 'chai';
-import chaiAsPromised from 'chai-as-promised';
-chai.use(chaiAsPromised);
-const expect = chai.expect;
+describe('Refungible token: Information getting', () => {
+  let donor: IKeyringPair;
+  let alice: IKeyringPair;
 
-describe('Refungible token: Information getting', () => {
   before(async function() {
-    await requirePallets(this, [Pallets.ReFungible]);
-  });
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      requirePalletsOrSkip(this, helper, [Pallets.ReFungible]);
 
-  itWeb3('totalSupply', async ({api, web3, privateKeyWrapper}) => {
-    const alice = privateKeyWrapper('//Alice');
-
-    const collectionId = (await createCollection(api, alice, {name: 'token name', mode: {type: 'ReFungible'}})).collectionId;
-
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
+      donor = privateKey('//Alice');
+      [alice] = await helper.arrange.createAccounts([20n], donor);
+    });
+  });
 
-    const tokenId = (await createRefungibleToken(api, alice, collectionId, 200n, {Ethereum: caller})).itemId;
+  itEth('totalSupply', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const collection = await helper.rft.mintCollection(alice, {tokenPrefix: 'MUON'});
+    const {tokenId} = await collection.mintToken(alice, 200n, {Ethereum: caller});
 
-    const address = tokenIdToAddress(collectionId, tokenId);
-    const contract = uniqueRefungibleToken(web3, address, caller);
+    const contract = helper.ethNativeContract.rftTokenById(collection.collectionId, tokenId, caller);
     const totalSupply = await contract.methods.totalSupply().call();
-
     expect(totalSupply).to.equal('200');
   });
 
-  itWeb3('balanceOf', async ({api, web3, privateKeyWrapper}) => {
-    const alice = privateKeyWrapper('//Alice');
-
-    const collectionId = (await createCollection(api, alice, {name: 'token name', mode: {type: 'ReFungible'}})).collectionId;
+  itEth('balanceOf', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const collection = await helper.rft.mintCollection(alice, {tokenPrefix: 'MUON'});
+    const {tokenId} = await collection.mintToken(alice, 200n, {Ethereum: caller});
 
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-
-    const tokenId = (await createRefungibleToken(api, alice, collectionId, 200n, {Ethereum: caller})).itemId;
-
-    const address = tokenIdToAddress(collectionId, tokenId);
-    const contract = uniqueRefungibleToken(web3, address, caller);
+    const contract = helper.ethNativeContract.rftTokenById(collection.collectionId, tokenId, caller);
     const balance = await contract.methods.balanceOf(caller).call();
-
     expect(balance).to.equal('200');
   });
 
-  itWeb3('decimals', async ({api, web3, privateKeyWrapper}) => {
-    const alice = privateKeyWrapper('//Alice');
+  itEth('decimals', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const collection = await helper.rft.mintCollection(alice, {tokenPrefix: 'MUON'});
+    const {tokenId} = await collection.mintToken(alice, 200n, {Ethereum: caller});
 
-    const collectionId = (await createCollection(api, alice, {name: 'token name', mode: {type: 'ReFungible'}})).collectionId;
-
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-
-    const tokenId = (await createRefungibleToken(api, alice, collectionId, 200n, {Ethereum: caller})).itemId;
-
-    const address = tokenIdToAddress(collectionId, tokenId);
-    const contract = uniqueRefungibleToken(web3, address, caller);
+    const contract = helper.ethNativeContract.rftTokenById(collection.collectionId, tokenId, caller);
     const decimals = await contract.methods.decimals().call();
-
     expect(decimals).to.equal('0');
   });
 });
 
 // FIXME: Need erc721 for ReFubgible.
 describe('Check ERC721 token URI for ReFungible', () => {
+  let donor: IKeyringPair;
+
   before(async function() {
-    await requirePallets(this, [Pallets.ReFungible]);
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      requirePalletsOrSkip(this, helper, [Pallets.ReFungible]);
+
+      donor = privateKey('//Alice');
+    });
   });
 
-  itWeb3('Empty tokenURI', async ({web3, api, privateKeyWrapper}) => {
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, owner);
-    let result = await helper.methods.createERC721MetadataCompatibleCollection('Mint collection', '1', '1', '').send();
-    const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
-    const receiver = createEthAccount(web3);
-    const contract = evmCollection(web3, owner, collectionIdAddress, {type: 'ReFungible'});
+  async function setup(helper: EthUniqueHelper, tokenPrefix: string, propertyKey?: string, propertyValue?: string): Promise<{contract: Contract, nextTokenId: string}> {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
 
+    const collectionHelper = helper.ethNativeContract.collectionHelpers(owner);
+    let result = await collectionHelper.methods.createERC721MetadataCompatibleCollection('Mint collection', 'a', 'b', tokenPrefix).send();
+    const collectionAddress = helper.ethAddress.normalizeAddress(result.events.CollectionCreated.returnValues.collectionId);
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'rft', owner);
+    
     const nextTokenId = await contract.methods.nextTokenId().call();
     expect(nextTokenId).to.be.equal('1');
     result = await contract.methods.mint(
@@ -97,166 +91,71 @@
       nextTokenId,
     ).send();
 
-    const events = normalizeEvents(result.events);
-    const address = collectionIdToAddress(collectionId);
+    if (propertyKey && propertyValue) {
+      // Set URL or suffix
+      await contract.methods.setProperty(nextTokenId, propertyKey, Buffer.from(propertyValue)).send();
+    }
+
+    const event = result.events.Transfer;
+    expect(event.address).to.be.equal(collectionAddress);
+    expect(event.returnValues.from).to.be.equal('0x0000000000000000000000000000000000000000');
+    expect(event.returnValues.to).to.be.equal(receiver);
+    expect(event.returnValues.tokenId).to.be.equal(nextTokenId);
 
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: '0x0000000000000000000000000000000000000000',
-          to: receiver,
-          tokenId: nextTokenId,
-        },
-      },
-    ]);
+    return {contract, nextTokenId};
+  }
 
+  itEth('Empty tokenURI', async ({helper}) => {
+    const {contract, nextTokenId} = await setup(helper, '');
     expect(await contract.methods.tokenURI(nextTokenId).call()).to.be.equal('');
   });
-
-  itWeb3('TokenURI from url', async ({web3, api, privateKeyWrapper}) => {
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, owner);
-    let result = await helper.methods.createERC721MetadataCompatibleCollection('Mint collection', '1', '1', 'BaseURI_').send();
-    const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
-    const receiver = createEthAccount(web3);
-    const contract = evmCollection(web3, owner, collectionIdAddress, {type: 'ReFungible'});
 
-    const nextTokenId = await contract.methods.nextTokenId().call();
-    expect(nextTokenId).to.be.equal('1');
-    result = await contract.methods.mint(
-      receiver,
-      nextTokenId,
-    ).send();
-
-    // Set URL
-    await contract.methods.setProperty(nextTokenId, 'url', Buffer.from('Token URI')).send();
-
-    const events = normalizeEvents(result.events);
-    const address = collectionIdToAddress(collectionId);
-
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: '0x0000000000000000000000000000000000000000',
-          to: receiver,
-          tokenId: nextTokenId,
-        },
-      },
-    ]);
-
+  itEth('TokenURI from url', async ({helper}) => {
+    const {contract, nextTokenId} = await setup(helper, 'BaseURI_', 'url', 'Token URI');
     expect(await contract.methods.tokenURI(nextTokenId).call()).to.be.equal('Token URI');
   });
-
-  itWeb3('TokenURI from baseURI + tokenId', async ({web3, api, privateKeyWrapper}) => {
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, owner);
-    let result = await helper.methods.createERC721MetadataCompatibleCollection('Mint collection', '1', '1', 'BaseURI_').send();
-    const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
-    const receiver = createEthAccount(web3);
-    const contract = evmCollection(web3, owner, collectionIdAddress, {type: 'ReFungible'});
 
-    const nextTokenId = await contract.methods.nextTokenId().call();
-    expect(nextTokenId).to.be.equal('1');
-    result = await contract.methods.mint(
-      receiver,
-      nextTokenId,
-    ).send();
-
-    const events = normalizeEvents(result.events);
-    const address = collectionIdToAddress(collectionId);
-
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: '0x0000000000000000000000000000000000000000',
-          to: receiver,
-          tokenId: nextTokenId,
-        },
-      },
-    ]);
-
+  itEth('TokenURI from baseURI + tokenId', async ({helper}) => {
+    const {contract, nextTokenId} = await setup(helper, 'BaseURI_');
     expect(await contract.methods.tokenURI(nextTokenId).call()).to.be.equal('BaseURI_' + nextTokenId);
   });
 
-  itWeb3('TokenURI from baseURI + suffix', async ({web3, api, privateKeyWrapper}) => {
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, owner);
-    let result = await helper.methods.createERC721MetadataCompatibleCollection('Mint collection', '1', '1', 'BaseURI_').send();
-    const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
-    const receiver = createEthAccount(web3);
-    const contract = evmCollection(web3, owner, collectionIdAddress, {type: 'ReFungible'});
-
-    const nextTokenId = await contract.methods.nextTokenId().call();
-    expect(nextTokenId).to.be.equal('1');
-    result = await contract.methods.mint(
-      receiver,
-      nextTokenId,
-    ).send();
-
-    // Set suffix
+  itEth('TokenURI from baseURI + suffix', async ({helper}) => {
     const suffix = '/some/suffix';
-    await contract.methods.setProperty(nextTokenId, 'suffix', Buffer.from(suffix)).send();
-
-    const events = normalizeEvents(result.events);
-    const address = collectionIdToAddress(collectionId);
-
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: '0x0000000000000000000000000000000000000000',
-          to: receiver,
-          tokenId: nextTokenId,
-        },
-      },
-    ]);
-
+    const {contract, nextTokenId} = await setup(helper, 'BaseURI_', 'suffix', suffix);
     expect(await contract.methods.tokenURI(nextTokenId).call()).to.be.equal('BaseURI_' + suffix);
   });
 });
 
 describe('Refungible: Plain calls', () => {
+  let donor: IKeyringPair;
+  let alice: IKeyringPair;
+
   before(async function() {
-    await requirePallets(this, [Pallets.ReFungible]);
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      requirePalletsOrSkip(this, helper, [Pallets.ReFungible]);
+
+      donor = privateKey('//Alice');
+      [alice] = await helper.arrange.createAccounts([50n], donor);
+    });
   });
 
-  itWeb3('Can perform approve()', async ({web3, api, privateKeyWrapper}) => {
-    const alice = privateKeyWrapper('//Alice');
+  itEth('Can perform approve()', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const spender = helper.eth.createAccount();
+    const collection = await helper.rft.mintCollection(alice);
+    const {tokenId} = await collection.mintToken(alice, 200n, {Ethereum: owner});
 
-    const collectionId = (await createCollection(api, alice, {name: 'token name', mode: {type: 'ReFungible'}})).collectionId;
-
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-
-    const tokenId = (await createRefungibleToken(api, alice, collectionId, 200n, {Ethereum: owner})).itemId;
-
-    const address = tokenIdToAddress(collectionId, tokenId);
+    const tokenAddress = helper.ethAddress.fromTokenId(collection.collectionId, tokenId);
+    const contract = helper.ethNativeContract.rftToken(tokenAddress, owner);
 
-    const spender = createEthAccount(web3);
-
-    const contract = uniqueRefungibleToken(web3, address, owner);
-
     {
       const result = await contract.methods.approve(spender, 100).send({from: owner});
-      const events = normalizeEvents(result.events);
-
-      expect(events).to.be.deep.equal([
-        {
-          address,
-          event: 'Approval',
-          args: {
-            owner,
-            spender,
-            value: '100',
-          },
-        },
-      ]);
+      const event = result.events.Approval;
+      expect(event.address).to.be.equal(tokenAddress);
+      expect(event.returnValues.owner).to.be.equal(owner);
+      expect(event.returnValues.spender).to.be.equal(spender);
+      expect(event.returnValues.value).to.be.equal('100');
     }
 
     {
@@ -265,49 +164,31 @@
     }
   });
 
-  itWeb3('Can perform transferFrom()', async ({web3, api, privateKeyWrapper}) => {
-    const alice = privateKeyWrapper('//Alice');
-
-    const collectionId = (await createCollection(api, alice, {name: 'token name', mode: {type: 'ReFungible'}})).collectionId;
+  itEth('Can perform transferFrom()', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const spender = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
+    const collection = await helper.rft.mintCollection(alice);
+    const {tokenId} = await collection.mintToken(alice, 200n, {Ethereum: owner});
 
-    const owner = createEthAccount(web3);
-    await transferBalanceToEth(api, alice, owner);
-
-    const tokenId = (await createRefungibleToken(api, alice, collectionId, 200n, {Ethereum: owner})).itemId;
-
-    const spender = createEthAccount(web3);
-    await transferBalanceToEth(api, alice, spender);
+    const tokenAddress = helper.ethAddress.fromTokenId(collection.collectionId, tokenId);
+    const contract = helper.ethNativeContract.rftToken(tokenAddress, owner);
 
-    const receiver = createEthAccount(web3);
-
-    const address = tokenIdToAddress(collectionId, tokenId);
-    const contract = uniqueRefungibleToken(web3, address, owner);
-
     await contract.methods.approve(spender, 100).send();
 
     {
       const result = await contract.methods.transferFrom(owner, receiver, 49).send({from: spender});
-      const events = normalizeEvents(result.events);
-      expect(events).to.include.deep.members([
-        {
-          address,
-          event: 'Transfer',
-          args: {
-            from: owner,
-            to: receiver,
-            value: '49',
-          },
-        },
-        {
-          address,
-          event: 'Approval',
-          args: {
-            owner,
-            spender,
-            value: '51',
-          },
-        },
-      ]);
+      let event = result.events.Transfer;
+      expect(event.address).to.be.equal(tokenAddress);
+      expect(event.returnValues.from).to.be.equal(owner);
+      expect(event.returnValues.to).to.be.equal(receiver);
+      expect(event.returnValues.value).to.be.equal('49');
+
+      event = result.events.Approval;
+      expect(event.address).to.be.equal(tokenAddress);
+      expect(event.returnValues.owner).to.be.equal(owner);
+      expect(event.returnValues.spender).to.be.equal(spender);
+      expect(event.returnValues.value).to.be.equal('51');
     }
 
     {
@@ -321,36 +202,22 @@
     }
   });
 
-  itWeb3('Can perform transfer()', async ({web3, api, privateKeyWrapper}) => {
-    const alice = privateKeyWrapper('//Alice');
+  itEth('Can perform transfer()', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
+    const collection = await helper.rft.mintCollection(alice);
+    const {tokenId} = await collection.mintToken(alice, 200n, {Ethereum: owner});
 
-    const collectionId = (await createCollection(api, alice, {name: 'token name', mode: {type: 'ReFungible'}})).collectionId;
-
-    const owner = createEthAccount(web3);
-    await transferBalanceToEth(api, alice, owner);
-
-    const tokenId = (await createRefungibleToken(api, alice, collectionId, 200n, {Ethereum: owner})).itemId;
-
-    const receiver = createEthAccount(web3);
-    await transferBalanceToEth(api, alice, receiver);
-
-    const address = tokenIdToAddress(collectionId, tokenId);
-    const contract = uniqueRefungibleToken(web3, address, owner);
+    const tokenAddress = helper.ethAddress.fromTokenId(collection.collectionId, tokenId);
+    const contract = helper.ethNativeContract.rftToken(tokenAddress, owner);
 
     {
       const result = await contract.methods.transfer(receiver, 50).send({from: owner});
-      const events = normalizeEvents(result.events);
-      expect(events).to.include.deep.members([
-        {
-          address,
-          event: 'Transfer',
-          args: {
-            from: owner,
-            to: receiver,
-            value: '50',
-          },
-        },
-      ]);
+      const event = result.events.Transfer;
+      expect(event.address).to.be.equal(tokenAddress);
+      expect(event.returnValues.from).to.be.equal(owner);
+      expect(event.returnValues.to).to.be.equal(receiver);
+      expect(event.returnValues.value).to.be.equal('50');
     }
 
     {
@@ -364,311 +231,262 @@
     }
   });
 
-  itWeb3('Can perform repartition()', async ({web3, api, privateKeyWrapper}) => {
-    const alice = privateKeyWrapper('//Alice');
-
-    const collectionId = (await createCollection(api, alice, {name: 'token name', mode: {type: 'ReFungible'}})).collectionId;
+  itEth('Can perform repartition()', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const receiver = await helper.eth.createAccountWithBalance(donor);
+    const collection = await helper.rft.mintCollection(alice);
+    const {tokenId} = await collection.mintToken(alice, 100n, {Ethereum: owner});
 
-    const owner = createEthAccount(web3);
-    await transferBalanceToEth(api, alice, owner);
+    const tokenAddress = helper.ethAddress.fromTokenId(collection.collectionId, tokenId);
+    const contract = helper.ethNativeContract.rftToken(tokenAddress, owner);
 
-    const receiver = createEthAccount(web3);
-    await transferBalanceToEth(api, alice, receiver);
-
-    const tokenId = (await createRefungibleToken(api, alice, collectionId, 100n, {Ethereum: owner})).itemId;
-
-    const address = tokenIdToAddress(collectionId, tokenId);
-    const contract = uniqueRefungibleToken(web3, address, owner);
-
     await contract.methods.repartition(200).send({from: owner});
     expect(+await contract.methods.balanceOf(owner).call()).to.be.equal(200);
     await contract.methods.transfer(receiver, 110).send({from: owner});
     expect(+await contract.methods.balanceOf(owner).call()).to.be.equal(90);
     expect(+await contract.methods.balanceOf(receiver).call()).to.be.equal(110);
 
-    await expect(contract.methods.repartition(80).send({from: owner})).to.eventually.be.rejected;
+    await expect(contract.methods.repartition(80).send({from: owner})).to.eventually.be.rejected; // Transaction is reverted
 
     await contract.methods.transfer(receiver, 90).send({from: owner});
     expect(+await contract.methods.balanceOf(owner).call()).to.be.equal(0);
     expect(+await contract.methods.balanceOf(receiver).call()).to.be.equal(200);
 
     await contract.methods.repartition(150).send({from: receiver});
-    await expect(contract.methods.transfer(owner, 160).send({from: receiver})).to.eventually.be.rejected;
+    await expect(contract.methods.transfer(owner, 160).send({from: receiver})).to.eventually.be.rejected; // Transaction is reverted
     expect(+await contract.methods.balanceOf(receiver).call()).to.be.equal(150);
   });
 
-  itWeb3('Can repartition with increased amount', async ({web3, api, privateKeyWrapper}) => {
-    const alice = privateKeyWrapper('//Alice');
-
-    const collectionId = (await createCollection(api, alice, {name: 'token name', mode: {type: 'ReFungible'}})).collectionId;
-
-    const owner = createEthAccount(web3);
-    await transferBalanceToEth(api, alice, owner);
-
-    const tokenId = (await createRefungibleToken(api, alice, collectionId, 100n, {Ethereum: owner})).itemId;
+  itEth('Can repartition with increased amount', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const collection = await helper.rft.mintCollection(alice);
+    const {tokenId} = await collection.mintToken(alice, 100n, {Ethereum: owner});
 
-    const address = tokenIdToAddress(collectionId, tokenId);
-    const contract = uniqueRefungibleToken(web3, address, owner);
+    const tokenAddress = helper.ethAddress.fromTokenId(collection.collectionId, tokenId);
+    const contract = helper.ethNativeContract.rftToken(tokenAddress, owner);
 
     const result = await contract.methods.repartition(200).send();
-    const events = normalizeEvents(result.events);
 
-    expect(events).to.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: '0x0000000000000000000000000000000000000000',
-          to: owner,
-          value: '100',
-        },
-      },
-    ]);
+    const event = result.events.Transfer;
+    expect(event.address).to.be.equal(tokenAddress);
+    expect(event.returnValues.from).to.be.equal('0x0000000000000000000000000000000000000000');
+    expect(event.returnValues.to).to.be.equal(owner);
+    expect(event.returnValues.value).to.be.equal('100');
   });
 
-  itWeb3('Can repartition with decreased amount', async ({web3, api, privateKeyWrapper}) => {
-    const alice = privateKeyWrapper('//Alice');
+  itEth('Can repartition with decreased amount', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const collection = await helper.rft.mintCollection(alice);
+    const {tokenId} = await collection.mintToken(alice, 100n, {Ethereum: owner});
 
-    const collectionId = (await createCollection(api, alice, {name: 'token name', mode: {type: 'ReFungible'}})).collectionId;
-
-    const owner = createEthAccount(web3);
-    await transferBalanceToEth(api, alice, owner);
-
-    const tokenId = (await createRefungibleToken(api, alice, collectionId, 100n, {Ethereum: owner})).itemId;
-
-    const address = tokenIdToAddress(collectionId, tokenId);
-    const contract = uniqueRefungibleToken(web3, address, owner);
+    const tokenAddress = helper.ethAddress.fromTokenId(collection.collectionId, tokenId);
+    const contract = helper.ethNativeContract.rftToken(tokenAddress, owner);
 
     const result = await contract.methods.repartition(50).send();
-    const events = normalizeEvents(result.events);
-    expect(events).to.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: owner,
-          to: '0x0000000000000000000000000000000000000000',
-          value: '50',
-        },
-      },
-    ]);
+    const event = result.events.Transfer;
+    expect(event.address).to.be.equal(tokenAddress);
+    expect(event.returnValues.from).to.be.equal(owner);
+    expect(event.returnValues.to).to.be.equal('0x0000000000000000000000000000000000000000');
+    expect(event.returnValues.value).to.be.equal('50');
   });
 
-  itWeb3('Receiving Transfer event on burning into full ownership', async ({web3, api, privateKeyWrapper}) => {
-    const caller = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const receiver = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const helper = evmCollectionHelpers(web3, caller);
-    const result = await helper.methods.createRFTCollection('Mint collection', '6', '6').send();
-    const {collectionIdAddress, collectionId} = await getCollectionAddressFromResult(api, result);
-    const contract = evmCollection(web3, caller, collectionIdAddress, {type: 'ReFungible'});
+  itEth('Receiving Transfer event on burning into full ownership', async ({helper}) => {
+    const caller = await helper.eth.createAccountWithBalance(donor);
+    const receiver = await helper.eth.createAccountWithBalance(donor);
+    const {collectionId, collectionAddress} = await helper.eth.createRefungibleCollection(caller, 'Devastation', '6', '6');
+    const contract = helper.ethNativeContract.collection(collectionAddress, 'rft', caller);
 
     const tokenId = await contract.methods.nextTokenId().call();
     await contract.methods.mint(caller, tokenId).send();
+    const tokenAddress = helper.ethAddress.fromTokenId(collectionId, tokenId);
+    const tokenContract = helper.ethNativeContract.rftToken(tokenAddress, caller);
 
-    const address = tokenIdToAddress(collectionId, tokenId);
-
-    const tokenContract =  uniqueRefungibleToken(web3, address, caller);
     await tokenContract.methods.repartition(2).send();
     await tokenContract.methods.transfer(receiver, 1).send();
 
-    const events =  await recordEvents(contract, async () =>
-      await tokenContract.methods.burnFrom(caller, 1).send());
-    expect(events).to.deep.equal([
-      {
-        address: collectionIdAddress,
-        event: 'Transfer',
-        args: {
-          from: '0xFFfFfFffFFfffFFfFFfFFFFFffFFFffffFfFFFfF',
-          to: receiver,
-          tokenId,
-        },
-      },
-    ]);
+    const events: any = [];
+    contract.events.allEvents((_: any, event: any) => {
+      events.push(event);
+    });
+    await tokenContract.methods.burnFrom(caller, 1).send();
+
+    const event = events[0];
+    expect(event.address).to.be.equal(collectionAddress);
+    expect(event.returnValues.from).to.be.equal('0xFFfFfFffFFfffFFfFFfFFFFFffFFFffffFfFFFfF');
+    expect(event.returnValues.to).to.be.equal(receiver);
+    expect(event.returnValues.tokenId).to.be.equal(tokenId);
   });
 });
 
 describe('Refungible: Fees', () => {
+  let donor: IKeyringPair;
+  let alice: IKeyringPair;
+
   before(async function() {
-    await requirePallets(this, [Pallets.ReFungible]);
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      requirePalletsOrSkip(this, helper, [Pallets.ReFungible]);
+
+      donor = privateKey('//Alice');
+      [alice] = await helper.arrange.createAccounts([50n], donor);
+    });
   });
 
-  itWeb3('approve() call fee is less than 0.2UNQ', async ({web3, api, privateKeyWrapper}) => {
-    const alice = privateKeyWrapper('//Alice');
+  itEth('approve() call fee is less than 0.2UNQ', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const spender = helper.eth.createAccount();
+    const collection = await helper.rft.mintCollection(alice);
+    const {tokenId} = await collection.mintToken(alice, 100n, {Ethereum: owner});
 
-    const collectionId = (await createCollection(api, alice, {mode: {type: 'ReFungible'}})).collectionId;
+    const tokenAddress = helper.ethAddress.fromTokenId(collection.collectionId, tokenId);
+    const contract = helper.ethNativeContract.rftToken(tokenAddress, owner);
 
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const spender = createEthAccount(web3);
-
-    const tokenId = (await createRefungibleToken(api, alice, collectionId, 200n, {Ethereum: owner})).itemId;
-
-    const address = tokenIdToAddress(collectionId, tokenId);
-    const contract = uniqueRefungibleToken(web3, address, owner);
-
-    const cost = await recordEthFee(api, owner, () => contract.methods.approve(spender, 100).send({from: owner}));
-    expect(cost < BigInt(0.2 * Number(UNIQUE)));
+    const cost = await helper.eth.recordCallFee(owner, () => contract.methods.approve(spender, 100).send({from: owner}));
+    expect(cost < BigInt(0.2 * Number(helper.balance.getOneTokenNominal())));
   });
 
-  itWeb3('transferFrom() call fee is less than 0.2UNQ', async ({web3, api, privateKeyWrapper}) => {
-    const alice = privateKeyWrapper('//Alice');
-
-    const collectionId = (await createCollection(api, alice, {mode: {type: 'ReFungible'}})).collectionId;
-
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const spender = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-
-    const tokenId = (await createRefungibleToken(api, alice, collectionId, 200n, {Ethereum: owner})).itemId;
+  itEth('transferFrom() call fee is less than 0.2UNQ', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const spender = await helper.eth.createAccountWithBalance(donor);
+    const collection = await helper.rft.mintCollection(alice);
+    const {tokenId} = await collection.mintToken(alice, 200n, {Ethereum: owner});
 
-    const address = tokenIdToAddress(collectionId, tokenId);
-    const contract = uniqueRefungibleToken(web3, address, owner);
+    const tokenAddress = helper.ethAddress.fromTokenId(collection.collectionId, tokenId);
+    const contract = helper.ethNativeContract.rftToken(tokenAddress, owner);
 
     await contract.methods.approve(spender, 100).send({from: owner});
 
-    const cost = await recordEthFee(api, spender, () => contract.methods.transferFrom(owner, spender, 100).send({from: spender}));
-    expect(cost < BigInt(0.2 * Number(UNIQUE)));
+    const cost = await helper.eth.recordCallFee(spender, () => contract.methods.transferFrom(owner, spender, 100).send({from: spender}));
+    expect(cost < BigInt(0.2 * Number(helper.balance.getOneTokenNominal())));
   });
 
-  itWeb3('transfer() call fee is less than 0.2UNQ', async ({web3, api, privateKeyWrapper}) => {
-    const alice = privateKeyWrapper('//Alice');
+  itEth('transfer() call fee is less than 0.2UNQ', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
+    const receiver = helper.eth.createAccount();
+    const collection = await helper.rft.mintCollection(alice);
+    const {tokenId} = await collection.mintToken(alice, 200n, {Ethereum: owner});
 
-    const collectionId = (await createCollection(api, alice, {mode: {type: 'ReFungible'}})).collectionId;
+    const tokenAddress = helper.ethAddress.fromTokenId(collection.collectionId, tokenId);
+    const contract = helper.ethNativeContract.rftToken(tokenAddress, owner);
 
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
-    const receiver = createEthAccount(web3);
-
-    const tokenId = (await createRefungibleToken(api, alice, collectionId, 200n, {Ethereum: owner})).itemId;
-
-    const address = tokenIdToAddress(collectionId, tokenId);
-    const contract = uniqueRefungibleToken(web3, address, owner);
-
-    const cost = await recordEthFee(api, owner, () => contract.methods.transfer(receiver, 100).send({from: owner}));
-    expect(cost < BigInt(0.2 * Number(UNIQUE)));
+    const cost = await helper.eth.recordCallFee(owner, () => contract.methods.transfer(receiver, 100).send({from: owner}));
+    expect(cost < BigInt(0.2 * Number(helper.balance.getOneTokenNominal())));
   });
 });
 
 describe('Refungible: Substrate calls', () => {
+  let donor: IKeyringPair;
+  let alice: IKeyringPair;
+
   before(async function() {
-    await requirePallets(this, [Pallets.ReFungible]);
-  });
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      requirePalletsOrSkip(this, helper, [Pallets.ReFungible]);
 
-  itWeb3('Events emitted for approve()', async ({web3, api, privateKeyWrapper}) => {
-    const alice = privateKeyWrapper('//Alice');
-
-    const collectionId = (await createCollection(api, alice, {mode: {type: 'ReFungible'}})).collectionId;
-
-    const receiver = createEthAccount(web3);
+      donor = privateKey('//Alice');
+      [alice] = await helper.arrange.createAccounts([50n], donor);
+    });
+  });
 
-    const tokenId = (await createRefungibleToken(api, alice, collectionId, 200n)).itemId;
+  itEth('Events emitted for approve()', async ({helper}) => {
+    const receiver = helper.eth.createAccount();
+    const collection = await helper.rft.mintCollection(alice);
+    const token = await collection.mintToken(alice, 200n);
 
-    const address = tokenIdToAddress(collectionId, tokenId);
-    const contract = uniqueRefungibleToken(web3, address);
+    const tokenAddress = helper.ethAddress.fromTokenId(collection.collectionId, token.tokenId);
+    const contract = helper.ethNativeContract.rftToken(tokenAddress);
 
-    const events = await recordEvents(contract, async () => {
-      expect(await approve(api, collectionId, tokenId, alice, {Ethereum: receiver}, 100n)).to.be.true;
+    const events: any = [];
+    contract.events.allEvents((_: any, event: any) => {
+      events.push(event);
     });
+    expect(await token.approve(alice, {Ethereum: receiver}, 100n)).to.be.true;
 
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Approval',
-        args: {
-          owner: subToEth(alice.address),
-          spender: receiver,
-          value: '100',
-        },
-      },
-    ]);
+    const event = events[0];
+    expect(event.event).to.be.equal('Approval');
+    expect(event.address).to.be.equal(tokenAddress);
+    expect(event.returnValues.owner).to.be.equal(helper.address.substrateToEth(alice.address));
+    expect(event.returnValues.spender).to.be.equal(receiver);
+    expect(event.returnValues.value).to.be.equal('100');
   });
 
-  itWeb3('Events emitted for transferFrom()', async ({web3, api, privateKeyWrapper}) => {
-    const alice = privateKeyWrapper('//Alice');
+  itEth('Events emitted for transferFrom()', async ({helper}) => {
+    const [bob] = await helper.arrange.createAccounts([10n], donor);
+    const receiver = helper.eth.createAccount();
+    const collection = await helper.rft.mintCollection(alice);
+    const token = await collection.mintToken(alice, 200n);
+    await token.approve(alice, {Substrate: bob.address}, 100n);
 
-    const collectionId = (await createCollection(api, alice, {mode: {type: 'ReFungible'}})).collectionId;
-    const bob = privateKeyWrapper('//Bob');
+    const tokenAddress = helper.ethAddress.fromTokenId(collection.collectionId, token.tokenId);
+    const contract = helper.ethNativeContract.rftToken(tokenAddress);
 
-    const receiver = createEthAccount(web3);
+    const events: any = [];
+    contract.events.allEvents((_: any, event: any) => {
+      events.push(event);
+    });
 
-    const tokenId = (await createRefungibleToken(api, alice, collectionId, 200n)).itemId;
-    expect(await approve(api, collectionId, tokenId, alice, bob.address, 100n)).to.be.true;
+    expect(await token.transferFrom(bob, {Substrate: alice.address}, {Ethereum: receiver},  51n)).to.be.true;
 
-    const address = tokenIdToAddress(collectionId, tokenId);
-    const contract = uniqueRefungibleToken(web3, address);
+    let event = events[0];
+    expect(event.event).to.be.equal('Transfer');
+    expect(event.address).to.be.equal(tokenAddress);
+    expect(event.returnValues.from).to.be.equal(helper.address.substrateToEth(alice.address));
+    expect(event.returnValues.to).to.be.equal(receiver);
+    expect(event.returnValues.value).to.be.equal('51');
 
-    const events = await recordEvents(contract, async () => {
-      expect(await transferFrom(api, collectionId, tokenId, bob, alice, {Ethereum: receiver},  51n)).to.be.true;
-    });
-
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: subToEth(alice.address),
-          to: receiver,
-          value: '51',
-        },
-      },
-      {
-        address,
-        event: 'Approval',
-        args: {
-          owner: subToEth(alice.address),
-          spender: subToEth(bob.address),
-          value: '49',
-        },
-      },
-    ]);
+    event = events[1];
+    expect(event.event).to.be.equal('Approval');
+    expect(event.address).to.be.equal(tokenAddress);
+    expect(event.returnValues.owner).to.be.equal(helper.address.substrateToEth(alice.address));
+    expect(event.returnValues.spender).to.be.equal(helper.address.substrateToEth(bob.address));
+    expect(event.returnValues.value).to.be.equal('49');
   });
 
-  itWeb3('Events emitted for transfer()', async ({web3, api, privateKeyWrapper}) => {
-    const alice = privateKeyWrapper('//Alice');
+  itEth('Events emitted for transfer()', async ({helper}) => {
+    const receiver = helper.eth.createAccount();
+    const collection = await helper.rft.mintCollection(alice);
+    const token = await collection.mintToken(alice, 200n);
 
-    const collectionId = (await createCollection(api, alice, {mode: {type: 'ReFungible'}})).collectionId;
+    const tokenAddress = helper.ethAddress.fromTokenId(collection.collectionId, token.tokenId);
+    const contract = helper.ethNativeContract.rftToken(tokenAddress);
 
-    const receiver = createEthAccount(web3);
-
-    const tokenId = (await createRefungibleToken(api, alice, collectionId, 200n)).itemId;
+    const events: any = [];
+    contract.events.allEvents((_: any, event: any) => {
+      events.push(event);
+    });
 
-    const address = tokenIdToAddress(collectionId, tokenId);
-    const contract = uniqueRefungibleToken(web3, address);
+    expect(await token.transfer(alice, {Ethereum: receiver},  51n)).to.be.true;
 
-    const events = await recordEvents(contract, async () => {
-      expect(await transfer(api, collectionId, tokenId, alice, {Ethereum: receiver},  51n)).to.be.true;
-    });
-
-    expect(events).to.be.deep.equal([
-      {
-        address,
-        event: 'Transfer',
-        args: {
-          from: subToEth(alice.address),
-          to: receiver,
-          value: '51',
-        },
-      },
-    ]);
+    const event = events[0];
+    expect(event.event).to.be.equal('Transfer');
+    expect(event.address).to.be.equal(tokenAddress);
+    expect(event.returnValues.from).to.be.equal(helper.address.substrateToEth(alice.address));
+    expect(event.returnValues.to).to.be.equal(receiver);
+    expect(event.returnValues.value).to.be.equal('51');
   });
 });
 
 describe('ERC 1633 implementation', () => {
+  let donor: IKeyringPair;
+
   before(async function() {
-    await requirePallets(this, [Pallets.ReFungible]);
-  });
+    await usingEthPlaygrounds(async (helper, privateKey) => {
+      requirePalletsOrSkip(this, helper, [Pallets.ReFungible]);
 
-  itWeb3('Default parent token address and id', async ({api, web3, privateKeyWrapper}) => {
-    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
+      donor = privateKey('//Alice');
+    });
+  });
 
-    const {collectionIdAddress, collectionId} = await createRFTCollection(api, web3, owner);
-    const refungibleContract = uniqueRefungible(web3, collectionIdAddress, owner);
-    const refungibleTokenId = await refungibleContract.methods.nextTokenId().call();
-    await refungibleContract.methods.mint(owner, refungibleTokenId).send();
+  itEth('Default parent token address and id', async ({helper}) => {
+    const owner = await helper.eth.createAccountWithBalance(donor);
 
-    const rftTokenAddress = tokenIdToAddress(collectionId, refungibleTokenId);
-    const refungibleTokenContract = uniqueRefungibleToken(web3, rftTokenAddress, owner);
+    const {collectionId, collectionAddress} = await helper.eth.createRefungibleCollection(owner, 'Sands', '', 'GRAIN');
+    const collectionContract = helper.ethNativeContract.collection(collectionAddress, 'rft', owner);
+    
+    const tokenId = await collectionContract.methods.nextTokenId().call();
+    await collectionContract.methods.mint(owner, tokenId).send();
+    const tokenAddress = helper.ethAddress.fromTokenId(collectionId, tokenId);
+    const tokenContract = helper.ethNativeContract.rftToken(tokenAddress, owner);
 
-    const tokenAddress = await refungibleTokenContract.methods.parentToken().call();
-    const tokenId = await refungibleTokenContract.methods.parentTokenId().call();
-    expect(tokenAddress).to.be.equal(collectionIdAddress);
-    expect(tokenId).to.be.equal(refungibleTokenId);
+    expect(await tokenContract.methods.parentToken().call()).to.be.equal(collectionAddress);
+    expect(await tokenContract.methods.parentTokenId().call()).to.be.equal(tokenId);
   });
 });

--- a/tests/src/eth/util/playgrounds/index.ts
+++ b/tests/src/eth/util/playgrounds/index.ts
@@ -12,6 +12,7 @@
 
 import chai from 'chai';
 import chaiAsPromised from 'chai-as-promised';
+import {requirePalletsOrSkip} from '../../../util/playgrounds';
 chai.use(chaiAsPromised);
 export const expect = chai.expect;
 
@@ -35,15 +36,26 @@
   }
 };
   
-export async function itEth(name: string, cb: (apis: { helper: EthUniqueHelper, privateKey: (seed: string) => IKeyringPair }) => any, opts: { only?: boolean, skip?: boolean } = {}) {
-  let i: any = it;
-  if (opts.only) i = i.only;
-  else if (opts.skip) i = i.skip;
-  i(name, async () => {
+export async function itEth(name: string, cb: (apis: { helper: EthUniqueHelper, privateKey: (seed: string) => IKeyringPair }) => any, opts: { only?: boolean, skip?: boolean, requiredPallets?: string[] } = {}) {
+  (opts.only ? it.only : 
+    opts.skip ? it.skip : it)(name, async function() {
     await usingEthPlaygrounds(async (helper, privateKey) => {
+      if (opts.requiredPallets) {
+        requirePalletsOrSkip(this, helper, opts.requiredPallets);
+      }
+
       await cb({helper, privateKey});
     });
   });
 }
+
+export async function itEthIfWithPallet(name: string, required: string[], cb: (apis: { helper: EthUniqueHelper, privateKey: (seed: string) => IKeyringPair }) => any, opts: { only?: boolean, skip?: boolean, requiredPallets?: string[] } = {}) {
+  return itEth(name, cb, {requiredPallets: required, ...opts});
+}
+
 itEth.only = (name: string, cb: (apis: { helper: EthUniqueHelper, privateKey: (seed: string) => IKeyringPair }) => any) => itEth(name, cb, {only: true});
-itEth.skip = (name: string, cb: (apis: { helper: EthUniqueHelper, privateKey: (seed: string) => IKeyringPair }) => any) => itEth(name, cb, {skip: true});
\ No newline at end of file
+itEth.skip = (name: string, cb: (apis: { helper: EthUniqueHelper, privateKey: (seed: string) => IKeyringPair }) => any) => itEth(name, cb, {skip: true});
+
+itEthIfWithPallet.only = (name: string, required: string[], cb: (apis: { helper: EthUniqueHelper, privateKey: (seed: string) => IKeyringPair }) => any) => itEthIfWithPallet(name, required, cb, {only: true});
+itEthIfWithPallet.skip = (name: string, required: string[], cb: (apis: { helper: EthUniqueHelper, privateKey: (seed: string) => IKeyringPair }) => any) => itEthIfWithPallet(name, required, cb, {skip: true});
+itEth.ifWithPallets = itEthIfWithPallet;

--- a/tests/src/eth/util/playgrounds/unique.dev.ts
+++ b/tests/src/eth/util/playgrounds/unique.dev.ts
@@ -27,6 +27,7 @@
 import refungibleAbi from '../../reFungibleAbi.json';
 import refungibleTokenAbi from '../../reFungibleTokenAbi.json';
 import contractHelpersAbi from './../contractHelpersAbi.json';
+import {TEthereumAccount} from '../../../util/playgrounds/types';
 
 class EthGroupBase {
   helper: EthUniqueHelper;
@@ -43,13 +44,13 @@
       return {error: `File not found: ${path}`};
     };
   
-    const knownImports = {} as any;
+    const knownImports = {} as {[key: string]: string};
     for(const imp of imports) {
       knownImports[imp.solPath] = (await readFile(imp.fsPath)).toString();
     }
   
     return function(path: string) {
-      if(knownImports.hasOwnPropertyDescriptor(path)) return {contents: knownImports[path]};
+      if(path in knownImports) return {contents: knownImports[path]};
       return {error: `File not found: ${path}`};
     };
   }
@@ -116,13 +117,17 @@
     return new web3.eth.Contract(abi as any, address, {gas: this.helper.eth.DEFAULT_GAS, ...(caller ? {from: caller} : {})});
   }
 
-  rftTokenByAddress(address: string, caller?: string): Contract {
+  collectionById(collectionId: number, mode: 'nft' | 'rft' | 'ft', caller?: string): Contract {
+    return this.collection(this.helper.ethAddress.fromCollectionId(collectionId), mode, caller);
+  }
+
+  rftToken(address: string, caller?: string): Contract {
     const web3 = this.helper.getWeb3();
     return new web3.eth.Contract(refungibleTokenAbi as any, address, {gas: this.helper.eth.DEFAULT_GAS, ...(caller ? {from: caller} : {})});
   }
 
-  rftToken(collectionId: number, tokenId: number, caller?: string): Contract {
-    return this.rftTokenByAddress(this.helper.ethAddress.fromTokenId(collectionId, tokenId), caller);
+  rftTokenById(collectionId: number, tokenId: number, caller?: string): Contract {
+    return this.rftToken(this.helper.ethAddress.fromTokenId(collectionId, tokenId), caller);
   }
 }
 
@@ -148,7 +153,7 @@
     return await this.helper.balance.transferToSubstrate(donor, evmToAddress(recepient), amount * (inTokens ? this.helper.balance.getOneTokenNominal() : 1n));
   }
 
-  async callEVM(signer: IKeyringPair, contractAddress: string, abi: any, value: string, gasLimit?: number) {
+  async sendEVM(signer: IKeyringPair, contractAddress: string, abi: string, value: string, gasLimit?: number) {
     if(!gasLimit) gasLimit = this.DEFAULT_GAS;
     const web3 = this.helper.getWeb3();
     const gasPrice = await web3.eth.getGasPrice();
@@ -159,6 +164,10 @@
       true,
     );
   }
+  
+  async callEVM(signer: TEthereumAccount, contractAddress: string, abi: string) {
+    return await this.helper.callRpc('api.rpc.eth.call', [{from: signer, to: contractAddress, data: abi}]);
+  }
 
   async createNonfungibleCollection(signer: string, name: string, description: string, tokenPrefix: string): Promise<{collectionId: number, collectionAddress: string}> {
     const collectionHelper = this.helper.ethNativeContract.collectionHelpers(signer);
@@ -171,6 +180,17 @@
     return {collectionId, collectionAddress};
   }
 
+  async createRefungibleCollection(signer: string, name: string, description: string, tokenPrefix: string): Promise<{collectionId: number, collectionAddress: string}> {
+    const collectionHelper = this.helper.ethNativeContract.collectionHelpers(signer);
+        
+    const result = await collectionHelper.methods.createRFTCollection(name, description, tokenPrefix).send();
+
+    const collectionAddress = this.helper.ethAddress.normalizeAddress(result.events.CollectionCreated.returnValues.collectionId);
+    const collectionId = this.helper.ethAddress.extractCollectionId(collectionAddress);
+
+    return {collectionId, collectionAddress};
+  }
+
   async deployCollectorContract(signer: string): Promise<Contract> {
     return await this.helper.ethContract.deployByCode(signer, 'Collector', `
     // SPDX-License-Identifier: UNLICENSED
@@ -215,6 +235,16 @@
     }
   `);
   }
+
+  async recordCallFee(user: string, call: () => Promise<any>): Promise<bigint> {
+    const before = await this.helper.balance.getEthereum(user);
+    await call();
+    // In dev mode, the transaction might not finish processing in time
+    await this.helper.wait.newBlocks(1);
+    const after = await this.helper.balance.getEthereum(user);
+
+    return before - after;
+  }
 }  
   
 class EthAddressGroup extends EthGroupBase {
@@ -240,7 +270,7 @@
   }
 
   fromTokenId(collectionId: number, tokenId: number): string  {
-    return this.helper.util.getNestingTokenAddress(collectionId, tokenId);
+    return this.helper.util.getTokenAddress({collectionId, tokenId});
   }
 
   normalizeAddress(address: string): string {

--- a/tests/src/nesting/graphs.test.ts
+++ b/tests/src/nesting/graphs.test.ts
@@ -1,9 +1,22 @@
-import {ApiPromise} from '@polkadot/api';
+// Copyright 2019-2022 Unique Network (Gibraltar) Ltd.
+// This file is part of Unique Network.
+
+// Unique Network is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Unique Network is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
+
 import {IKeyringPair} from '@polkadot/types/types';
-import {expect} from 'chai';
-import {tokenIdToCross} from '../eth/util/helpers';
-import usingApi, {executeTransaction} from '../substrate/substrate-api';
-import {getCreateCollectionResult, transferExpectSuccess, setCollectionLimitsExpectSuccess} from '../util/helpers';
+import {expect, itSub, usingPlaygrounds} from '../util/playgrounds';
+import {UniqueHelper, UniqueNFToken} from '../util/playgrounds/unique';
 
 /**
  * ```dot
@@ -12,46 +25,47 @@
  * 8 -> 5
  * ```
  */
-async function buildComplexObjectGraph(api: ApiPromise, sender: IKeyringPair): Promise<number> {
-  const events = await executeTransaction(api, sender, api.tx.unique.createCollectionEx({mode: 'NFT', permissions: {nesting: {tokenOwner: true}}}));
-  const {collectionId} = getCreateCollectionResult(events);
+async function buildComplexObjectGraph(helper: UniqueHelper, sender: IKeyringPair): Promise<UniqueNFToken[]> {
+  const collection = await helper.nft.mintCollection(sender, {permissions: {nesting: {tokenOwner: true}}});
+  const tokens = await collection.mintMultipleTokens(sender, Array(8).fill({owner: {Substrate: sender.address}}));
 
-  await executeTransaction(api, sender, api.tx.unique.createMultipleItemsEx(collectionId, {NFT: Array(8).fill({owner: {Substrate: sender.address}})}));
-
-  await transferExpectSuccess(collectionId, 8, sender, tokenIdToCross(collectionId, 5));
-
-  await transferExpectSuccess(collectionId, 7, sender, tokenIdToCross(collectionId, 6));
-  await transferExpectSuccess(collectionId, 6, sender, tokenIdToCross(collectionId, 5));
-  await transferExpectSuccess(collectionId, 5, sender, tokenIdToCross(collectionId, 2));
+  await tokens[7].nest(sender, tokens[4]);
+  await tokens[6].nest(sender, tokens[5]);
+  await tokens[5].nest(sender, tokens[4]);
+  await tokens[4].nest(sender, tokens[1]);
+  await tokens[3].nest(sender, tokens[2]);
+  await tokens[2].nest(sender, tokens[1]);
+  await tokens[1].nest(sender, tokens[0]);
 
-  await transferExpectSuccess(collectionId, 4, sender, tokenIdToCross(collectionId, 3));
-  await transferExpectSuccess(collectionId, 3, sender, tokenIdToCross(collectionId, 2));
-  await transferExpectSuccess(collectionId, 2, sender, tokenIdToCross(collectionId, 1));
-
-  return collectionId;
+  return tokens;
 }
 
 describe('Graphs', () => {
-  it('Ouroboros can\'t be created in a complex graph', async () => {
-    await usingApi(async (api, privateKeyWrapper) => {
-      const alice = privateKeyWrapper('//Alice');
-      const collection = await buildComplexObjectGraph(api, alice);
-      const tokenTwoParent = tokenIdToCross(collection, 1);
+  let alice: IKeyringPair;
 
-      // to self
-      await expect(
-        executeTransaction(api, alice, api.tx.unique.transfer(tokenIdToCross(collection, 1), collection, 1, 1)),
-        'first transaction',  
-      ).to.be.rejectedWith(/structure\.OuroborosDetected/);
-      // to nested part of graph
-      await expect(
-        executeTransaction(api, alice, api.tx.unique.transfer(tokenIdToCross(collection, 5), collection, 1, 1)),
-        'second transaction',
-      ).to.be.rejectedWith(/structure\.OuroborosDetected/);
-      await expect(
-        executeTransaction(api, alice, api.tx.unique.transferFrom(tokenTwoParent, tokenIdToCross(collection, 8), collection, 2, 1)),
-        'third transaction',
-      ).to.be.rejectedWith(/structure\.OuroborosDetected/);
+  before(async () => {
+    await usingPlaygrounds(async (helper, privateKey) => {
+      const donor = privateKey('//Alice');
+      [alice] = await helper.arrange.createAccounts([10n], donor);
     });
   });
+
+  itSub('Ouroboros can\'t be created in a complex graph', async ({helper}) => {
+    const tokens = await buildComplexObjectGraph(helper, alice);
+
+    // to self
+    await expect(
+      tokens[0].nest(alice, tokens[0]),
+      'first transaction',  
+    ).to.be.rejectedWith(/structure\.OuroborosDetected/);
+    // to nested part of graph
+    await expect(
+      tokens[0].nest(alice, tokens[4]),
+      'second transaction',
+    ).to.be.rejectedWith(/structure\.OuroborosDetected/);
+    await expect(
+      tokens[1].transferFrom(alice, tokens[0].nestingAccount(), tokens[7].nestingAccount()),
+      'third transaction',
+    ).to.be.rejectedWith(/structure\.OuroborosDetected/);
+  });
 });

--- a/tests/src/nesting/migration-check.test.ts
+++ b/tests/src/nesting/migration-check.test.ts
@@ -8,7 +8,8 @@
 import find from 'find-process';
 
 // todo un-skip for migrations
-describe.skip('Migration testing', () => {
+// todo:playgrounds skipped, this one is outdated. Probably to be deleted/replaced.
+describe.skip('Migration testing: Properties', () => {
   let alice: IKeyringPair;
 
   before(async() => {

--- a/tests/src/nesting/nest.test.ts
+++ b/tests/src/nesting/nest.test.ts
@@ -1,840 +1,667 @@
-import {expect} from 'chai';
-import {tokenIdToAddress} from '../eth/util/helpers';
-import usingApi, {executeTransaction} from '../substrate/substrate-api';
-import {
-  addCollectionAdminExpectSuccess,
-  addToAllowListExpectSuccess,
-  createCollectionExpectSuccess,
-  createItemExpectSuccess,
-  enableAllowListExpectSuccess,
-  enablePublicMintingExpectSuccess,
-  getTokenChildren,
-  getTokenOwner,
-  getTopmostTokenOwner,
-  normalizeAccountId,
-  setCollectionPermissionsExpectSuccess,
-  transferExpectFailure,
-  transferExpectSuccess,
-  transferFromExpectSuccess,
-  setCollectionLimitsExpectSuccess,
-  requirePallets,
-  Pallets,
-} from '../util/helpers';
-import {IKeyringPair} from '@polkadot/types/types';
+// Copyright 2019-2022 Unique Network (Gibraltar) Ltd.
+// This file is part of Unique Network.
+
+// Unique Network is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
 
-let alice: IKeyringPair;
-let bob: IKeyringPair;
-let charlie: IKeyringPair;
+// Unique Network is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
 
+// You should have received a copy of the GNU General Public License
+// along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
+
+import {IKeyringPair} from '@polkadot/types/types';
+import {expect, itSub, Pallets, usingPlaygrounds} from '../util/playgrounds';
+
 describe('Integration Test: Composite nesting tests', () => {
+  let alice: IKeyringPair;
+  let bob: IKeyringPair;
+
   before(async () => {
-    await usingApi(async (_, privateKeyWrapper) => {
-      alice = privateKeyWrapper('//Alice');
-      bob = privateKeyWrapper('//Bob');
+    await usingPlaygrounds(async (helper, privateKey) => {
+      const donor = privateKey('//Alice');
+      [alice, bob] = await helper.arrange.createAccounts([50n, 10n], donor);
     });
   });
 
-  it('Performs the full suite: bundles a token, transfers, and unnests', async () => {
-    await usingApi(async api => {
-      const collection = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collection, {nesting: {tokenOwner: true}});
-      const targetToken = await createItemExpectSuccess(alice, collection, 'NFT');
+  itSub('Performs the full suite: bundles a token, transfers, and unnests', async ({helper}) => {
+    const collection = await helper.nft.mintCollection(alice, {permissions: {nesting: {tokenOwner: true}}});
+    const targetToken = await collection.mintToken(alice);
 
-      // Create a nested token
-      const nestedToken = await createItemExpectSuccess(alice, collection, 'NFT', {Ethereum: tokenIdToAddress(collection, targetToken)});
-      expect(await getTopmostTokenOwner(api, collection, nestedToken)).to.be.deep.equal({Substrate: alice.address});
-      expect(await getTokenOwner(api, collection, nestedToken)).to.be.deep.equal({Ethereum: tokenIdToAddress(collection, targetToken).toLowerCase()});
+    // Create an immediately nested token
+    const nestedToken = await collection.mintToken(alice, targetToken.nestingAccount());
+    expect(await nestedToken.getTopmostOwner()).to.be.deep.equal({Substrate: alice.address});
+    expect(await nestedToken.getOwner()).to.be.deep.equal(targetToken.nestingAccount().toLowerCase());
+    
+    // Create a token to be nested
+    const newToken = await collection.mintToken(alice);
 
-      // Create a token to be nested
-      const newToken = await createItemExpectSuccess(alice, collection, 'NFT');
-
-      // Nest
-      await transferExpectSuccess(collection, newToken, alice, {Ethereum: tokenIdToAddress(collection, targetToken)});
-      expect(await getTopmostTokenOwner(api, collection, newToken)).to.be.deep.equal({Substrate: alice.address});
-      expect(await getTokenOwner(api, collection, newToken)).to.be.deep.equal({Ethereum: tokenIdToAddress(collection, targetToken).toLowerCase()});
+    // Nest
+    await newToken.nest(alice, targetToken);
+    expect(await newToken.getTopmostOwner()).to.be.deep.equal({Substrate: alice.address});
+    expect(await newToken.getOwner()).to.be.deep.equal(targetToken.nestingAccount().toLowerCase());
 
-      // Move bundle to different user
-      await transferExpectSuccess(collection, targetToken, alice, {Substrate: bob.address});
-      expect(await getTopmostTokenOwner(api, collection, nestedToken)).to.be.deep.equal({Substrate: bob.address});
-      expect(await getTokenOwner(api, collection, nestedToken)).to.be.deep.equal({Ethereum: tokenIdToAddress(collection, targetToken).toLowerCase()});
+    // Move bundle to different user
+    await targetToken.transfer(alice, {Substrate: bob.address});
+    expect(await nestedToken.getTopmostOwner()).to.be.deep.equal({Substrate: bob.address});
+    expect(await nestedToken.getOwner()).to.be.deep.equal(targetToken.nestingAccount().toLowerCase());
+    expect(await newToken.getTopmostOwner()).to.be.deep.equal({Substrate: bob.address});
+    expect(await newToken.getOwner()).to.be.deep.equal(targetToken.nestingAccount().toLowerCase());
 
-      // Unnest
-      await transferFromExpectSuccess(collection, newToken, bob, {Ethereum: tokenIdToAddress(collection, targetToken)}, {Substrate: bob.address});
-      expect(await getTokenOwner(api, collection, newToken)).to.be.deep.equal({Substrate: bob.address});
-    });
+    // Unnest
+    await newToken.unnest(bob, targetToken, {Substrate: bob.address});
+    expect(await newToken.getTopmostOwner()).to.be.deep.equal({Substrate: bob.address});
+    expect(await newToken.getOwner()).to.be.deep.equal({Substrate: bob.address});
   });
-
-  it('Transfers an already bundled token', async () => {
-    await usingApi(async api => {
-      const collection = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collection, {nesting: {tokenOwner: true}});
 
-      const tokenA = await createItemExpectSuccess(alice, collection, 'NFT');
-      const tokenB = await createItemExpectSuccess(alice, collection, 'NFT');
-
-      // Create a nested token
-      const tokenC = await createItemExpectSuccess(alice, collection, 'NFT', {Ethereum: tokenIdToAddress(collection, tokenA)});
-      expect(await getTopmostTokenOwner(api, collection, tokenC)).to.be.deep.equal({Substrate: alice.address});
-      expect(await getTokenOwner(api, collection, tokenC)).to.be.deep.equal({Ethereum: tokenIdToAddress(collection, tokenA).toLowerCase()});
+  itSub('Transfers an already bundled token', async ({helper}) => {
+    const collection = await helper.nft.mintCollection(alice, {permissions: {nesting: {tokenOwner: true}}});
+    const tokenA = await collection.mintToken(alice);
+    const tokenB = await collection.mintToken(alice);
 
-      // Transfer the nested token to another token
-      await expect(executeTransaction(
-        api,
-        alice,
-        api.tx.unique.transferFrom(
-          normalizeAccountId({Ethereum: tokenIdToAddress(collection, tokenA)}),
-          normalizeAccountId({Ethereum: tokenIdToAddress(collection, tokenB)}),
-          collection,
-          tokenC,
-          1,
-        ),
-      )).to.not.be.rejected;
-      expect(await getTopmostTokenOwner(api, collection, tokenC)).to.be.deep.equal({Substrate: alice.address});
-      expect(await getTokenOwner(api, collection, tokenC)).to.be.deep.equal({Ethereum: tokenIdToAddress(collection, tokenB).toLowerCase()});
-    });
+    // Create a nested token
+    const tokenC = await collection.mintToken(alice, tokenA.nestingAccount());
+    expect(await tokenC.getOwner()).to.be.deep.equal(tokenA.nestingAccount().toLowerCase());
+    
+    // Transfer the nested token to another token
+    await expect(tokenC.transferFrom(alice, tokenA.nestingAccount(), tokenB.nestingAccount())).to.be.fulfilled;
+    expect(await tokenC.getTopmostOwner()).to.be.deep.equal({Substrate: alice.address});
+    expect(await tokenC.getOwner()).to.be.deep.equal(tokenB.nestingAccount().toLowerCase());
   });
 
-  it('Checks token children', async () => {
-    await usingApi(async api => {
-      const collectionA = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionLimitsExpectSuccess(alice, collectionA, {ownerCanTransfer: true});
-      await setCollectionPermissionsExpectSuccess(alice, collectionA, {nesting: {tokenOwner: true}});
-      const collectionB = await createCollectionExpectSuccess({mode: {type: 'Fungible', decimalPoints: 0}});
+  itSub('Checks token children', async ({helper}) => {
+    const collectionA = await helper.nft.mintCollection(alice, {permissions: {nesting: {tokenOwner: true}}});
+    const collectionB = await helper.ft.mintCollection(alice);
+    
+    const targetToken = await collectionA.mintToken(alice);
+    expect((await targetToken.getChildren()).length).to.be.equal(0, 'Children length check at creation');
 
-      const targetToken = await createItemExpectSuccess(alice, collectionA, 'NFT');
-      const targetAddress = {Ethereum: tokenIdToAddress(collectionA, targetToken)};
-      let children = await getTokenChildren(api, collectionA, targetToken);
-      expect(children.length).to.be.equal(0, 'Children length check at creation');
+    // Create a nested NFT token
+    const tokenA = await collectionA.mintToken(alice, targetToken.nestingAccount());
+    expect(await targetToken.getChildren()).to.have.deep.members([
+      {tokenId: tokenA.tokenId, collectionId: collectionA.collectionId},
+    ], 'Children contents check at nesting #1').and.be.length(1, 'Children length check at nesting #1');
 
-      // Create a nested NFT token
-      const tokenA = await createItemExpectSuccess(alice, collectionA, 'NFT', targetAddress);
-      children = await getTokenChildren(api, collectionA, targetToken);
-      expect(children.length).to.be.equal(1, 'Children length check at nesting #1');
-      expect(children).to.have.deep.members([
-        {token: tokenA, collection: collectionA},
-      ], 'Children contents check at nesting #1');
+    // Create then nest
+    const tokenB = await collectionA.mintToken(alice);
+    await tokenB.nest(alice, targetToken);
+    expect(await targetToken.getChildren()).to.have.deep.members([
+      {tokenId: tokenA.tokenId, collectionId: collectionA.collectionId},
+      {tokenId: tokenB.tokenId, collectionId: collectionA.collectionId},
+    ], 'Children contents check at nesting #2').and.be.length(2, 'Children length check at nesting #2');
 
-      // Create then nest
-      const tokenB = await createItemExpectSuccess(alice, collectionA, 'NFT');
-      await transferExpectSuccess(collectionA, tokenB, alice, targetAddress);
-      children = await getTokenChildren(api, collectionA, targetToken);
-      expect(children.length).to.be.equal(2, 'Children length check at nesting #2');
-      expect(children).to.have.deep.members([
-        {token: tokenA, collection: collectionA},
-        {token: tokenB, collection: collectionA},
-      ], 'Children contents check at nesting #2');
+    // Move token B to a different user outside the nesting tree
+    await tokenB.unnest(alice, targetToken, {Substrate: bob.address});
+    expect(await targetToken.getChildren()).to.be.have.deep.members([
+      {tokenId: tokenA.tokenId, collectionId: collectionA.collectionId},
+    ], 'Children contents check at nesting #3 (unnesting)').and.be.length(1, 'Children length check at nesting #3 (unnesting)');
 
-      // Move token B to a different user outside the nesting tree
-      await transferFromExpectSuccess(collectionA, tokenB, alice, targetAddress, bob);
-      children = await getTokenChildren(api, collectionA, targetToken);
-      expect(children.length).to.be.equal(1, 'Children length check at unnesting');
-      expect(children).to.be.have.deep.members([
-        {token: tokenA, collection: collectionA},
-      ], 'Children contents check at unnesting');
+    // Create a fungible token in another collection and then nest
+    await collectionB.mint(alice, 10n);
+    await collectionB.transfer(alice, targetToken.nestingAccount(), 2n);
+    expect(await targetToken.getChildren()).to.be.have.deep.members([
+      {tokenId: tokenA.tokenId, collectionId: collectionA.collectionId},
+      {tokenId: 0, collectionId: collectionB.collectionId},
+    ], 'Children contents check at nesting #4 (from another collection)')
+      .and.be.length(2, 'Children length check at nesting #4 (from another collection)');
+    
+    // Move part of the fungible token inside token A deeper in the nesting tree
+    await collectionB.transferFrom(alice, targetToken.nestingAccount(), tokenA.nestingAccount(), 1n);
+    expect(await targetToken.getChildren()).to.be.have.deep.members([
+      {tokenId: tokenA.tokenId, collectionId: collectionA.collectionId},
+      {tokenId: 0, collectionId: collectionB.collectionId},
+    ], 'Children contents check at nesting #5 (deeper)').and.be.length(2, 'Children length check at nesting #5 (deeper)');
+    expect(await tokenA.getChildren()).to.be.have.deep.members([
+      {tokenId: 0, collectionId: collectionB.collectionId},
+    ], 'Children contents check at nesting #5.5 (deeper)').and.be.length(1, 'Children length check at nesting #5.5 (deeper)');
 
-      // Create a fungible token in another collection and then nest
-      const tokenC = await createItemExpectSuccess(alice, collectionB, 'Fungible');
-      await transferExpectSuccess(collectionB, tokenC, alice, targetAddress, 1, 'Fungible');
-      children = await getTokenChildren(api, collectionA, targetToken);
-      expect(children.length).to.be.equal(2, 'Children length check at nesting #3 (from another collection)');
-      expect(children).to.be.have.deep.members([
-        {token: tokenA, collection: collectionA},
-        {token: tokenC, collection: collectionB},
-      ], 'Children contents check at nesting #3 (from another collection)');
-
-      // Move the fungible token inside token A deeper in the nesting tree
-      await transferFromExpectSuccess(collectionB, tokenC, alice, targetAddress, {Ethereum: tokenIdToAddress(collectionA, tokenA)}, 1, 'Fungible');
-      children = await getTokenChildren(api, collectionA, targetToken);
-      expect(children.length).to.be.equal(1, 'Children length check at deeper nesting');
-      expect(children).to.be.have.deep.members([
-        {token: tokenA, collection: collectionA},
-      ], 'Children contents check at deeper nesting');
-    });
+    // Move the remaining part of the fungible token inside token A deeper in the nesting tree
+    await collectionB.transferFrom(alice, targetToken.nestingAccount(), tokenA.nestingAccount(), 1n);
+    expect(await targetToken.getChildren()).to.be.have.deep.members([
+      {tokenId: tokenA.tokenId, collectionId: collectionA.collectionId},
+    ], 'Children contents check at nesting #6 (deeper)').and.be.length(1, 'Children length check at nesting #6 (deeper)');
+    expect(await tokenA.getChildren()).to.be.have.deep.members([
+      {tokenId: 0, collectionId: collectionB.collectionId},
+    ], 'Children contents check at nesting #6.5 (deeper)').and.be.length(1, 'Children length check at nesting #6.5 (deeper)');
   });
 });
 
-describe('Integration Test: Various token type nesting', async () => {
+describe('Integration Test: Various token type nesting', () => {
+  let alice: IKeyringPair;
+  let bob: IKeyringPair;
+  let charlie: IKeyringPair;
+
   before(async () => {
-    await usingApi(async (_, privateKeyWrapper) => {
-      alice = privateKeyWrapper('//Alice');
-      bob = privateKeyWrapper('//Bob');
-      charlie = privateKeyWrapper('//Charlie');
+    await usingPlaygrounds(async (helper, privateKey) => {
+      const donor = privateKey('//Alice');
+      [alice, bob, charlie] = await helper.arrange.createAccounts([50n, 10n, 10n], donor);
     });
   });
 
-  it('Admin (NFT): allows an Admin to nest a token', async () => {
-    await usingApi(async api => {
-      const collection = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collection, {nesting: {collectionAdmin: true}});
-      await addCollectionAdminExpectSuccess(alice, collection, bob.address);
-      const targetToken = await createItemExpectSuccess(alice, collection, 'NFT', charlie.address);
+  itSub('Admin (NFT): allows an Admin to nest a token', async ({helper}) => {
+    const collection = await helper.nft.mintCollection(alice, {permissions: {nesting: {collectionAdmin: true}}});
+    await collection.addAdmin(alice, {Substrate: bob.address});
+    const targetToken = await collection.mintToken(alice, {Substrate: charlie.address});
 
-      // Create a nested token
-      const nestedToken = await createItemExpectSuccess(bob, collection, 'NFT', {Ethereum: tokenIdToAddress(collection, targetToken)});
-      expect(await getTopmostTokenOwner(api, collection, nestedToken)).to.be.deep.equal({Substrate: charlie.address});
-      expect(await getTokenOwner(api, collection, nestedToken)).to.be.deep.equal({Ethereum: tokenIdToAddress(collection, targetToken).toLowerCase()});
+    // Create an immediately nested token
+    const nestedToken = await collection.mintToken(bob, targetToken.nestingAccount());
+    expect(await nestedToken.getTopmostOwner()).to.be.deep.equal({Substrate: charlie.address});
+    expect(await nestedToken.getOwner()).to.be.deep.equal(targetToken.nestingAccount().toLowerCase());
 
-      // Create a token to be nested and nest
-      const newToken = await createItemExpectSuccess(bob, collection, 'NFT');
-      await transferExpectSuccess(collection, newToken, bob, {Ethereum: tokenIdToAddress(collection, targetToken)});
-      expect(await getTopmostTokenOwner(api, collection, newToken)).to.be.deep.equal({Substrate: charlie.address});
-      expect(await getTokenOwner(api, collection, newToken)).to.be.deep.equal({Ethereum: tokenIdToAddress(collection, targetToken).toLowerCase()});
-    });
+    // Create a token to be nested and nest
+    const newToken = await collection.mintToken(bob);
+    await newToken.nest(bob, targetToken);
+    expect(await newToken.getTopmostOwner()).to.be.deep.equal({Substrate: charlie.address});
+    expect(await newToken.getOwner()).to.be.deep.equal(targetToken.nestingAccount().toLowerCase());
   });
 
-  it('Admin (NFT): Admin and Token Owner can operate together', async () => {
-    await usingApi(async api => {
-      const collection = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collection, {nesting: {tokenOwner: true, collectionAdmin: true}});
-      await addCollectionAdminExpectSuccess(alice, collection, bob.address);
-      const targetToken = await createItemExpectSuccess(alice, collection, 'NFT', charlie.address);
+  itSub('Admin (NFT): Admin and Token Owner can operate together', async ({helper}) => {
+    const collection = await helper.nft.mintCollection(alice, {permissions: {nesting: {collectionAdmin: true, tokenOwner: true}}});
+    await collection.addAdmin(alice, {Substrate: bob.address});
+    const targetToken = await collection.mintToken(alice, {Substrate: charlie.address});
 
-      // Create a nested token by an administrator
-      const nestedToken = await createItemExpectSuccess(bob, collection, 'NFT', {Ethereum: tokenIdToAddress(collection, targetToken)});
-      expect(await getTopmostTokenOwner(api, collection, nestedToken)).to.be.deep.equal({Substrate: charlie.address});
-      expect(await getTokenOwner(api, collection, nestedToken)).to.be.deep.equal({Ethereum: tokenIdToAddress(collection, targetToken).toLowerCase()});
+    // Create an immediately nested token by an administrator
+    const nestedToken = await collection.mintToken(bob, targetToken.nestingAccount());
+    expect(await nestedToken.getTopmostOwner()).to.be.deep.equal({Substrate: charlie.address});
+    expect(await nestedToken.getOwner()).to.be.deep.equal(targetToken.nestingAccount().toLowerCase());
 
-      // Create a token and allow the owner to nest too
-      const newToken = await createItemExpectSuccess(alice, collection, 'NFT', charlie.address);
-      await transferExpectSuccess(collection, newToken, charlie, {Ethereum: tokenIdToAddress(collection, nestedToken)});
-      expect(await getTopmostTokenOwner(api, collection, newToken)).to.be.deep.equal({Substrate: charlie.address});
-      expect(await getTokenOwner(api, collection, newToken)).to.be.deep.equal({Ethereum: tokenIdToAddress(collection, nestedToken).toLowerCase()});
-    });
+    // Create a token to be nested and nest
+    const newToken = await collection.mintToken(alice, {Substrate: charlie.address});
+    await newToken.nest(charlie, targetToken);
+    expect(await newToken.getTopmostOwner()).to.be.deep.equal({Substrate: charlie.address});
+    expect(await newToken.getOwner()).to.be.deep.equal(targetToken.nestingAccount().toLowerCase());
   });
 
-  it('Admin (NFT): allows an Admin to nest a token (Restricted nesting)', async () => {
-    await usingApi(async api => {
-      const collectionA = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await addCollectionAdminExpectSuccess(alice, collectionA, bob.address);
-      const collectionB = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await addCollectionAdminExpectSuccess(alice, collectionB, bob.address);
-      await setCollectionPermissionsExpectSuccess(alice, collectionA, {nesting: {collectionAdmin: true, restricted:[collectionA, collectionB]}});
-      const targetToken = await createItemExpectSuccess(alice, collectionA, 'NFT', charlie.address);
+  itSub('Admin (NFT): allows an Admin to nest a token (Restricted nesting)', async ({helper}) => {
+    const collectionA = await helper.nft.mintCollection(alice);
+    await collectionA.addAdmin(alice, {Substrate: bob.address});
+    const collectionB = await helper.nft.mintCollection(alice);
+    await collectionB.addAdmin(alice, {Substrate: bob.address});
+    await collectionA.setPermissions(alice, {nesting: {collectionAdmin: true, restricted:[collectionB.collectionId]}});
+    const targetToken = await collectionA.mintToken(alice, {Substrate: charlie.address});
 
-      // Create a nested token
-      const nestedToken = await createItemExpectSuccess(bob, collectionB, 'NFT', {Ethereum: tokenIdToAddress(collectionA, targetToken)});
-      expect(await getTopmostTokenOwner(api, collectionB, nestedToken)).to.be.deep.equal({Substrate: charlie.address});
-      expect(await getTokenOwner(api, collectionB, nestedToken)).to.be.deep.equal({Ethereum: tokenIdToAddress(collectionA, targetToken).toLowerCase()});
+    // Create an immediately nested token
+    const nestedToken = await collectionB.mintToken(bob, targetToken.nestingAccount());
+    expect(await nestedToken.getTopmostOwner()).to.be.deep.equal({Substrate: charlie.address});
+    expect(await nestedToken.getOwner()).to.be.deep.equal(targetToken.nestingAccount().toLowerCase());
 
-      // Create a token to be nested and nest
-      const newToken = await createItemExpectSuccess(bob, collectionB, 'NFT');
-      await transferExpectSuccess(collectionB, newToken, bob, {Ethereum: tokenIdToAddress(collectionA, targetToken)});
-      expect(await getTopmostTokenOwner(api, collectionB, newToken)).to.be.deep.equal({Substrate: charlie.address});
-      expect(await getTokenOwner(api, collectionB, newToken)).to.be.deep.equal({Ethereum: tokenIdToAddress(collectionA, targetToken).toLowerCase()});
-    });
+    // Create a token to be nested and nest
+    const newToken = await collectionB.mintToken(bob);
+    await newToken.nest(bob, targetToken);
+    expect(await newToken.getTopmostOwner()).to.be.deep.equal({Substrate: charlie.address});
+    expect(await newToken.getOwner()).to.be.deep.equal(targetToken.nestingAccount().toLowerCase());
   });
 
   // ---------- Non-Fungible ----------
 
-  it('NFT: allows an Owner to nest/unnest their token', async () => {
-    await usingApi(async api => {
-      const collection = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collection, {nesting: {tokenOwner: true}});
-      const targetToken = await createItemExpectSuccess(alice, collection, 'NFT');
+  itSub('NFT: allows an Owner to nest/unnest their token', async ({helper}) => {
+    const collection = await helper.nft.mintCollection(alice, {permissions: {access: 'AllowList', mintMode: true, nesting: {tokenOwner: true}}});
+    await collection.addToAllowList(alice, {Substrate: charlie.address});
+    const targetToken = await collection.mintToken(charlie);
+    await collection.addToAllowList(alice, targetToken.nestingAccount());
 
-      // Create a nested token
-      const nestedToken = await createItemExpectSuccess(alice, collection, 'NFT', {Ethereum: tokenIdToAddress(collection, targetToken)});
-      expect(await getTopmostTokenOwner(api, collection, nestedToken)).to.be.deep.equal({Substrate: alice.address});
-      expect(await getTokenOwner(api, collection, nestedToken)).to.be.deep.equal({Ethereum: tokenIdToAddress(collection, targetToken).toLowerCase()});
+    // Create an immediately nested token
+    const nestedToken = await collection.mintToken(charlie, targetToken.nestingAccount());
+    expect(await nestedToken.getTopmostOwner()).to.be.deep.equal({Substrate: charlie.address});
+    expect(await nestedToken.getOwner()).to.be.deep.equal(targetToken.nestingAccount().toLowerCase());
 
-      // Create a token to be nested and nest
-      const newToken = await createItemExpectSuccess(alice, collection, 'NFT');
-      await transferExpectSuccess(collection, newToken, alice, {Ethereum: tokenIdToAddress(collection, targetToken)});
-      expect(await getTopmostTokenOwner(api, collection, newToken)).to.be.deep.equal({Substrate: alice.address});
-      expect(await getTokenOwner(api, collection, newToken)).to.be.deep.equal({Ethereum: tokenIdToAddress(collection, targetToken).toLowerCase()});
-    });
+    // Create a token to be nested and nest
+    const newToken = await collection.mintToken(charlie);
+    await newToken.nest(charlie, targetToken);
+    expect(await newToken.getTopmostOwner()).to.be.deep.equal({Substrate: charlie.address});
+    expect(await newToken.getOwner()).to.be.deep.equal(targetToken.nestingAccount().toLowerCase());
   });
 
-  it('NFT: allows an Owner to nest/unnest their token (Restricted nesting)', async () => {
-    await usingApi(async api => {
-      const collection = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collection, {nesting: {tokenOwner: true, restricted:[collection]}});
-      const targetToken = await createItemExpectSuccess(alice, collection, 'NFT');
+  itSub('NFT: allows an Owner to nest/unnest their token (Restricted nesting)', async ({helper}) => {
+    const collectionA = await helper.nft.mintCollection(alice);
+    const collectionB = await helper.nft.mintCollection(alice);
+    //await collectionB.addAdmin(alice, {Substrate: bob.address});
+    const targetToken = await collectionA.mintToken(alice, {Substrate: charlie.address});
 
-      // Create a nested token
-      const nestedToken = await createItemExpectSuccess(alice, collection, 'NFT', {Ethereum: tokenIdToAddress(collection, targetToken)});
-      expect(await getTopmostTokenOwner(api, collection, nestedToken)).to.be.deep.equal({Substrate: alice.address});
-      expect(await getTokenOwner(api, collection, nestedToken)).to.be.deep.equal({Ethereum: tokenIdToAddress(collection, targetToken).toLowerCase()});
+    await collectionA.setPermissions(alice, {access: 'AllowList', mintMode: true, nesting: {tokenOwner: true, restricted:[collectionB.collectionId]}});
+    await collectionA.addToAllowList(alice, {Substrate: charlie.address});
+    await collectionA.addToAllowList(alice, targetToken.nestingAccount());
+
+    await collectionB.setPermissions(alice, {access: 'AllowList', mintMode: true});
+    await collectionB.addToAllowList(alice, {Substrate: charlie.address});
+    await collectionB.addToAllowList(alice, targetToken.nestingAccount());
 
-      // Create a token to be nested and nest
-      const newToken = await createItemExpectSuccess(alice, collection, 'NFT');
-      await transferExpectSuccess(collection, newToken, alice, {Ethereum: tokenIdToAddress(collection, targetToken)});
-      expect(await getTopmostTokenOwner(api, collection, newToken)).to.be.deep.equal({Substrate: alice.address});
-      expect(await getTokenOwner(api, collection, newToken)).to.be.deep.equal({Ethereum: tokenIdToAddress(collection, targetToken).toLowerCase()});
-    });
+    // Create an immediately nested token
+    const nestedToken = await collectionB.mintToken(charlie, targetToken.nestingAccount());
+    expect(await nestedToken.getTopmostOwner()).to.be.deep.equal({Substrate: charlie.address});
+    expect(await nestedToken.getOwner()).to.be.deep.equal(targetToken.nestingAccount().toLowerCase());
+
+    // Create a token to be nested and nest
+    const newToken = await collectionB.mintToken(charlie);
+    await newToken.nest(charlie, targetToken);
+    expect(await newToken.getTopmostOwner()).to.be.deep.equal({Substrate: charlie.address});
+    expect(await newToken.getOwner()).to.be.deep.equal(targetToken.nestingAccount().toLowerCase());
   });
 
   // ---------- Fungible ----------
 
-  it('Fungible: allows an Owner to nest/unnest their token', async () => {
-    await usingApi(async api => {
-      const collectionNFT = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collectionNFT, {nesting: {tokenOwner: true}});
-      const targetToken = await createItemExpectSuccess(alice, collectionNFT, 'NFT', {Substrate: alice.address});
-      const targetAddress = {Ethereum: tokenIdToAddress(collectionNFT, targetToken)};
+  itSub('Fungible: allows an Owner to nest/unnest their token', async ({helper}) => {
+    const collectionNFT = await helper.nft.mintCollection(alice, {permissions: {access: 'AllowList', mintMode: true, nesting: {tokenOwner: true}}});
+    const collectionFT = await helper.ft.mintCollection(alice);
+    const targetToken = await collectionNFT.mintToken(alice, {Substrate: charlie.address});
 
-      const collectionFT = await createCollectionExpectSuccess({mode: {type: 'Fungible', decimalPoints: 0}});
+    await collectionNFT.addToAllowList(alice, {Substrate: charlie.address});
+    await collectionNFT.addToAllowList(alice, targetToken.nestingAccount());
 
-      // Create a nested token
-      await expect(executeTransaction(api, alice, api.tx.unique.createItem(
-        collectionFT,
-        targetAddress,
-        {Fungible: {Value: 10}},
-      ))).to.not.be.rejected;
+    await collectionFT.setPermissions(alice, {access: 'AllowList', mintMode: true});
+    await collectionFT.addToAllowList(alice, {Substrate: charlie.address});
+    await collectionFT.addToAllowList(alice, targetToken.nestingAccount());
 
-      // Nest a new token
-      const newToken = await createItemExpectSuccess(alice, collectionFT, 'Fungible');
-      await transferExpectSuccess(collectionFT, newToken, alice, targetAddress, 1, 'Fungible');
-    });
+    // Create an immediately nested token
+    await collectionFT.mint(charlie, 5n, targetToken.nestingAccount());
+    expect(await collectionFT.getBalance(targetToken.nestingAccount())).to.be.equal(5n);
+
+    // Create a token to be nested and nest
+    await collectionFT.mint(charlie, 5n);
+    await collectionFT.transfer(charlie, targetToken.nestingAccount(), 2n);
+    expect(await collectionFT.getBalance(targetToken.nestingAccount())).to.be.equal(7n);
   });
 
-  it('Fungible: allows an Owner to nest/unnest their token (Restricted nesting)', async () => {
-    await usingApi(async api => {
-      const collectionNFT = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      const targetToken = await createItemExpectSuccess(alice, collectionNFT, 'NFT', {Substrate: alice.address});
-      const targetAddress = {Ethereum: tokenIdToAddress(collectionNFT, targetToken)};
+  itSub('Fungible: allows an Owner to nest/unnest their token (Restricted nesting)', async ({helper}) => {
+    const collectionNFT = await helper.nft.mintCollection(alice);
+    const collectionFT = await helper.ft.mintCollection(alice);
+    const targetToken = await collectionNFT.mintToken(alice, {Substrate: charlie.address});
 
-      const collectionFT = await createCollectionExpectSuccess({mode: {type: 'Fungible', decimalPoints: 0}});
+    await collectionNFT.setPermissions(alice, {access: 'AllowList', mintMode: true, nesting: {tokenOwner: true, restricted:[collectionFT.collectionId]}});
+    await collectionNFT.addToAllowList(alice, {Substrate: charlie.address});
+    await collectionNFT.addToAllowList(alice, targetToken.nestingAccount());
 
-      await setCollectionPermissionsExpectSuccess(alice, collectionNFT, {nesting: {tokenOwner: true, restricted: [collectionFT]}});
+    await collectionFT.setPermissions(alice, {access: 'AllowList', mintMode: true});
+    await collectionFT.addToAllowList(alice, {Substrate: charlie.address});
+    await collectionFT.addToAllowList(alice, targetToken.nestingAccount());
 
-      // Create a nested token
-      await expect(executeTransaction(api, alice, api.tx.unique.createItem(
-        collectionFT,
-        targetAddress,
-        {Fungible: {Value: 10}},
-      ))).to.not.be.rejected;
+    // Create an immediately nested token
+    await collectionFT.mint(charlie, 5n, targetToken.nestingAccount());
+    expect(await collectionFT.getBalance(targetToken.nestingAccount())).to.be.equal(5n);
 
-      // Nest a new token
-      const newToken = await createItemExpectSuccess(alice, collectionFT, 'Fungible');
-      await transferExpectSuccess(collectionFT, newToken, alice, targetAddress, 1, 'Fungible');
-    });
+    // Create a token to be nested and nest
+    await collectionFT.mint(charlie, 5n);
+    await collectionFT.transfer(charlie, targetToken.nestingAccount(), 2n);
+    expect(await collectionFT.getBalance(targetToken.nestingAccount())).to.be.equal(7n);
   });
 
   // ---------- Re-Fungible ----------
 
-  it('ReFungible: allows an Owner to nest/unnest their token', async function() {
-    await requirePallets(this, [Pallets.ReFungible]);
+  itSub.ifWithPallets('ReFungible: allows an Owner to nest/unnest their token', [Pallets.ReFungible], async ({helper}) => {
+    const collectionNFT = await helper.nft.mintCollection(alice, {permissions: {access: 'AllowList', mintMode: true, nesting: {tokenOwner: true}}});
+    const collectionRFT = await helper.rft.mintCollection(alice);
+    const targetToken = await collectionNFT.mintToken(alice, {Substrate: charlie.address});
 
-    await usingApi(async api => {
-      const collectionNFT = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collectionNFT, {nesting: {tokenOwner: true}});
-      const targetToken = await createItemExpectSuccess(alice, collectionNFT, 'NFT', {Substrate: alice.address});
-      const targetAddress = {Ethereum: tokenIdToAddress(collectionNFT, targetToken)};
+    await collectionNFT.addToAllowList(alice, {Substrate: charlie.address});
+    await collectionNFT.addToAllowList(alice, targetToken.nestingAccount());
 
-      const collectionRFT = await createCollectionExpectSuccess({mode: {type: 'ReFungible'}});
+    await collectionRFT.setPermissions(alice, {access: 'AllowList', mintMode: true});
+    await collectionRFT.addToAllowList(alice, {Substrate: charlie.address});
+    await collectionRFT.addToAllowList(alice, targetToken.nestingAccount());
 
-      // Create a nested token
-      await expect(executeTransaction(api, alice, api.tx.unique.createItem(
-        collectionRFT,
-        targetAddress,
-        {ReFungible: {pieces: 100}},
-      ))).to.not.be.rejected;
+    // Create an immediately nested token
+    const nestedToken = await collectionRFT.mintToken(charlie, 5n, targetToken.nestingAccount());
+    expect(await nestedToken.getBalance(targetToken.nestingAccount())).to.be.equal(5n);
 
-      // Nest a new token
-      const newToken = await createItemExpectSuccess(alice, collectionRFT, 'ReFungible');
-      await transferExpectSuccess(collectionRFT, newToken, alice, targetAddress, 100, 'ReFungible');
-    });
+    // Create a token to be nested and nest
+    const newToken = await collectionRFT.mintToken(charlie, 5n);
+    await newToken.transfer(charlie, targetToken.nestingAccount(), 2n);
+    expect(await newToken.getBalance(targetToken.nestingAccount())).to.be.equal(2n);
   });
 
-  it('ReFungible: allows an Owner to nest/unnest their token (Restricted nesting)', async function() {
-    await requirePallets(this, [Pallets.ReFungible]);
+  itSub.ifWithPallets('ReFungible: allows an Owner to nest/unnest their token (Restricted nesting)', [Pallets.ReFungible], async ({helper}) => {
+    const collectionNFT = await helper.nft.mintCollection(alice);
+    const collectionRFT = await helper.rft.mintCollection(alice);
+    const targetToken = await collectionNFT.mintToken(alice, {Substrate: charlie.address});
 
-    await usingApi(async api => {
-      const collectionNFT = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      const targetToken = await createItemExpectSuccess(alice, collectionNFT, 'NFT', {Substrate: alice.address});
-      const targetAddress = {Ethereum: tokenIdToAddress(collectionNFT, targetToken)};
+    await collectionNFT.setPermissions(alice, {access: 'AllowList', mintMode: true, nesting: {tokenOwner: true, restricted:[collectionRFT.collectionId]}});
+    await collectionNFT.addToAllowList(alice, {Substrate: charlie.address});
+    await collectionNFT.addToAllowList(alice, targetToken.nestingAccount());
 
-      const collectionRFT = await createCollectionExpectSuccess({mode: {type: 'ReFungible'}});
+    await collectionRFT.setPermissions(alice, {access: 'AllowList', mintMode: true});
+    await collectionRFT.addToAllowList(alice, {Substrate: charlie.address});
+    await collectionRFT.addToAllowList(alice, targetToken.nestingAccount());
 
-      await setCollectionPermissionsExpectSuccess(alice, collectionNFT, {nesting: {tokenOwner: true, restricted:[collectionRFT]}});
+    // Create an immediately nested token
+    const nestedToken = await collectionRFT.mintToken(charlie, 5n, targetToken.nestingAccount());
+    expect(await nestedToken.getBalance(targetToken.nestingAccount())).to.be.equal(5n);
 
-      // Create a nested token
-      await expect(executeTransaction(api, alice, api.tx.unique.createItem(
-        collectionRFT,
-        targetAddress,
-        {ReFungible: {pieces: 100}},
-      ))).to.not.be.rejected;
-
-      // Nest a new token
-      const newToken = await createItemExpectSuccess(alice, collectionRFT, 'ReFungible');
-      await transferExpectSuccess(collectionRFT, newToken, alice, targetAddress, 100, 'ReFungible');
-    });
+    // Create a token to be nested and nest
+    const newToken = await collectionRFT.mintToken(charlie, 5n);
+    await newToken.transfer(charlie, targetToken.nestingAccount(), 2n);
+    expect(await newToken.getBalance(targetToken.nestingAccount())).to.be.equal(2n);
   });
 });
 
-describe('Negative Test: Nesting', async() => {
+describe('Negative Test: Nesting', () => {
+  let alice: IKeyringPair;
+  let bob: IKeyringPair;
+
   before(async () => {
-    await usingApi(async (_, privateKeyWrapper) => {
-      alice = privateKeyWrapper('//Alice');
-      bob = privateKeyWrapper('//Bob');
+    await usingPlaygrounds(async (helper, privateKey) => {
+      const donor = privateKey('//Alice');
+      [alice, bob] = await helper.arrange.createAccounts([100n, 50n], donor);
     });
   });
 
-  it('Disallows excessive token nesting', async () => {
-    await usingApi(async api => {
-      const collection = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collection, {nesting: {tokenOwner: true}});
-      const targetToken = await createItemExpectSuccess(alice, collection, 'NFT');
-
-      const maxNestingLevel = 5;
-      let prevToken = targetToken;
+  itSub('Disallows excessive token nesting', async ({helper}) => {
+    const collection = await helper.nft.mintCollection(alice, {permissions: {nesting: {tokenOwner: true}}});
+    let token = await collection.mintToken(alice);
 
-      // Create a nested-token matryoshka
-      for (let i = 0; i < maxNestingLevel; i++) {
-        const nestedToken = await createItemExpectSuccess(
-          alice,
-          collection,
-          'NFT',
-          {Ethereum: tokenIdToAddress(collection, prevToken)},
-        );
+    const maxNestingLevel = 5;
 
-        prevToken = nestedToken;
-      }
-
-      // The nesting depth is limited by `maxNestingLevel`
-      await expect(executeTransaction(api, alice, api.tx.unique.createItem(
-        collection,
-        {Ethereum: tokenIdToAddress(collection, prevToken)},
-          {nft: {}} as any,
-      )), 'while creating nested token').to.be.rejectedWith(/^structure\.DepthLimit$/);
+    // Create a nested-token matryoshka
+    for (let i = 0; i < maxNestingLevel; i++) {
+      token = await collection.mintToken(alice, token.nestingAccount());
+    }
 
-      expect(await getTopmostTokenOwner(api, collection, prevToken)).to.be.deep.equal({Substrate: alice.address});
-    });
+    // The nesting depth is limited by `maxNestingLevel`
+    await expect(collection.mintToken(alice, token.nestingAccount()))
+      .to.be.rejectedWith(/structure\.DepthLimit/);
+    expect(await token.getTopmostOwner()).to.be.deep.equal({Substrate: alice.address});
+    expect(await token.getChildren()).to.be.length(0);
   });
 
   // ---------- Admin ------------
 
-  it('Admin (NFT): disallows an Admin to operate nesting when only TokenOwner is allowed', async () => {
-    await usingApi(async api => {
-      const collection = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collection, {nesting: {tokenOwner: true}});
-      await addCollectionAdminExpectSuccess(alice, collection, bob.address);
-      const targetToken = await createItemExpectSuccess(alice, collection, 'NFT');
+  itSub('Admin (NFT): disallows an Admin to operate nesting when only TokenOwner is allowed', async ({helper}) => {
+    const collection = await helper.nft.mintCollection(alice, {permissions: {nesting: {tokenOwner: true}}});
+    await collection.addAdmin(alice, {Substrate: bob.address});
+    const targetToken = await collection.mintToken(alice);
 
-      // Try to create a nested token as collection admin when it's disallowed
-      await expect(executeTransaction(api, bob, api.tx.unique.createItem(
-        collection,
-        {Ethereum: tokenIdToAddress(collection, targetToken)},
-          {nft: {}} as any,
-      )), 'while creating nested token').to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
+    // Try to create an immediately nested token as collection admin when it's disallowed
+    await expect(collection.mintToken(bob, targetToken.nestingAccount()))
+      .to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
 
-      // Try to create and nest a token in the wrong collection
-      const newToken = await createItemExpectSuccess(bob, collection, 'NFT');
-      await expect(executeTransaction(
-        api, 
-        bob, 
-        api.tx.unique.transfer({Ethereum: tokenIdToAddress(collection, targetToken)}, collection, newToken, 1),
-      ), 'while nesting new token').to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
-      expect(await getTokenOwner(api, collection, newToken)).to.be.deep.equal({Substrate: bob.address});
-    });
+    // Try to create a token to be nested and nest
+    const newToken = await collection.mintToken(bob);
+    await expect(newToken.nest(bob, targetToken))
+      .to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
+
+    expect(await targetToken.getChildren()).to.be.length(0);
+    expect(await newToken.getOwner()).to.be.deep.equal({Substrate: bob.address});
   });
 
-  it('Admin (NFT): disallows a Token Owner to operate nesting when only Admin is allowed', async () => {
-    await usingApi(async api => {
-      const collection = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collection, {nesting: {collectionAdmin: true}});
-      await addToAllowListExpectSuccess(alice, collection, bob.address);
-      await enableAllowListExpectSuccess(alice, collection);
-      await enablePublicMintingExpectSuccess(alice, collection);
-      const targetToken = await createItemExpectSuccess(alice, collection, 'NFT');
+  itSub('Admin (NFT): disallows a Token Owner to operate nesting when only Admin is allowed', async ({helper}) => {
+    const collection = await helper.nft.mintCollection(alice, {permissions: {access: 'AllowList', mintMode: true, nesting: {collectionAdmin: true}}});
+    const targetToken = await collection.mintToken(alice, {Substrate: bob.address});
+    await collection.addToAllowList(alice, {Substrate: bob.address});
+    await collection.addToAllowList(alice, targetToken.nestingAccount());
+
+    // Try to create a nested token as token owner when it's disallowed
+    await expect(collection.mintToken(bob, targetToken.nestingAccount()))
+      .to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
 
-      // Try to create a nested token as collection admin when it's disallowed
-      await expect(executeTransaction(api, bob, api.tx.unique.createItem(
-        collection,
-        {Ethereum: tokenIdToAddress(collection, targetToken)},
-          {nft: {}} as any,
-      )), 'while creating nested token').to.be.rejectedWith(/common\.AddressNotInAllowlist/); 
+    // Try to create a token to be nested and nest
+    const newToken = await collection.mintToken(bob);
+    await expect(newToken.nest(bob, targetToken))
+      .to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
 
-      // Try to create and nest a token in the wrong collection
-      const newToken = await createItemExpectSuccess(bob, collection, 'NFT');
-      await expect(executeTransaction(
-        api, 
-        bob, 
-        api.tx.unique.transfer({Ethereum: tokenIdToAddress(collection, targetToken)}, collection, newToken, 1),
-      ), 'while nesting new token').to.be.rejectedWith(/common\.AddressNotInAllowlist/);
-      expect(await getTokenOwner(api, collection, newToken)).to.be.deep.equal({Substrate: bob.address});
-    });
+    expect(await targetToken.getChildren()).to.be.length(0);
+    expect(await newToken.getOwner()).to.be.deep.equal({Substrate: bob.address});
   });
 
-  it('Admin (NFT): disallows an Admin to nest and unnest someone else\'s token', async () => {
-    await usingApi(async api => {
-      const collection = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionLimitsExpectSuccess(alice, collection, {ownerCanTransfer: true});
-      await setCollectionPermissionsExpectSuccess(alice, collection, {nesting: {collectionAdmin: true}});
+  itSub('Admin (NFT): disallows an Admin to unnest someone else\'s token', async ({helper}) => {
+    const collection = await helper.nft.mintCollection(alice, {limits: {ownerCanTransfer: true}, permissions: {access: 'AllowList', mintMode: true, nesting: {collectionAdmin: true}}});
+    //await collection.addAdmin(alice, {Substrate: bob.address});
+    const targetToken = await collection.mintToken(alice, {Substrate: bob.address});
+    await collection.addToAllowList(alice, {Substrate: bob.address});
+    await collection.addToAllowList(alice, targetToken.nestingAccount());
 
-      await addToAllowListExpectSuccess(alice, collection, bob.address);
-      await enableAllowListExpectSuccess(alice, collection);
-      await enablePublicMintingExpectSuccess(alice, collection);
-
-      // Create a token to attempt to be nested into
-      const targetToken = await createItemExpectSuccess(bob, collection, 'NFT');
-      const targetAddress = {Ethereum: tokenIdToAddress(collection, targetToken).toLowerCase()};
+    // Try to nest somebody else's token
+    const newToken = await collection.mintToken(bob);
+    await expect(newToken.nest(alice, targetToken))
+      .to.be.rejectedWith(/common\.NoPermission/);
 
-      // Try to nest somebody else's token
-      const newToken = await createItemExpectSuccess(bob, collection, 'NFT');
-      await expect(executeTransaction(
-        api, 
-        alice, 
-        api.tx.unique.transferFrom(targetAddress, {Substrate: bob.address}, collection, newToken, 1),
-      ), 'while nesting another\'s token token').to.be.rejectedWith(/common\.AddressNotInAllowlist/);
-      expect(await getTokenOwner(api, collection, newToken)).to.be.deep.equal({Substrate: bob.address});
+    // Try to unnest a token belonging to someone else as collection admin
+    const nestedToken = await collection.mintToken(alice, targetToken.nestingAccount());
+    await expect(nestedToken.unnest(alice, targetToken, {Substrate: bob.address}))
+      .to.be.rejectedWith(/common\.AddressNotInAllowlist/);
 
-      // Nest a token as admin and try to unnest it, now belonging to someone else
-      const nestedToken = await createItemExpectSuccess(alice, collection, 'NFT', targetAddress);
-      await expect(executeTransaction(
-        api, 
-        alice, 
-        api.tx.unique.transferFrom(targetAddress, normalizeAccountId(alice), collection, nestedToken, 1),
-      ), 'while unnesting another\'s token').to.be.rejectedWith(/common\.AddressNotInAllowlist/);
-      expect(await getTokenOwner(api, collection, nestedToken)).to.be.deep.equal(targetAddress);
-      expect(await getTopmostTokenOwner(api, collection, nestedToken)).to.be.deep.equal({Substrate: bob.address});
-    });
+    expect(await targetToken.getChildren()).to.be.length(1);
+    expect(await nestedToken.getTopmostOwner()).to.be.deep.equal({Substrate: bob.address});
+    expect(await nestedToken.getOwner()).to.be.deep.equal(targetToken.nestingAccount().toLowerCase());
   });
 
-  it('Admin (NFT): disallows an Admin to nest a token from an unlisted collection (Restricted nesting)', async () => {
-    await usingApi(async api => {
-      const collectionA = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      const collectionB = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collectionA, {nesting: {collectionAdmin: true, restricted:[collectionA]}});
+  itSub('Admin (NFT): disallows an Admin to nest a token from an unlisted collection (Restricted nesting)', async ({helper}) => {
+    const collectionA = await helper.nft.mintCollection(alice);
+    const collectionB = await helper.nft.mintCollection(alice);
+    await collectionA.setPermissions(alice, {nesting: {collectionAdmin: true, restricted: [collectionA.collectionId]}});
+    const targetToken = await collectionA.mintToken(alice);
 
-      // Create a token to attempt to be nested into
-      const targetToken = await createItemExpectSuccess(alice, collectionA, 'NFT');
+    // Try to create a nested token from another collection
+    await expect(collectionB.mintToken(alice, targetToken.nestingAccount()))
+      .to.be.rejectedWith(/common\.SourceCollectionIsNotAllowedToNest/);
 
-      // Try to create and nest a token in the wrong collection
-      const newToken = await createItemExpectSuccess(alice, collectionB, 'NFT');
-      await expect(executeTransaction(
-        api, 
-        alice, 
-        api.tx.unique.transfer({Ethereum: tokenIdToAddress(collectionA, targetToken)}, collectionB, newToken, 1),
-      ), 'while nesting a foreign token').to.be.rejectedWith(/common\.SourceCollectionIsNotAllowedToNest/);
-      expect(await getTokenOwner(api, collectionB, newToken)).to.be.deep.equal({Substrate: alice.address});
-    });
+    // Create a token in another collection yet to be nested and try to nest
+    const newToken = await collectionB.mintToken(alice);
+    await expect(newToken.nest(alice, targetToken))
+      .to.be.rejectedWith(/common\.SourceCollectionIsNotAllowedToNest/);
+
+    expect(await targetToken.getChildren()).to.be.length(0);
+    expect(await newToken.getOwner()).to.be.deep.equal({Substrate: alice.address});
   });
 
   // ---------- Non-Fungible ----------
 
-  it('NFT: disallows to nest token if nesting is disabled', async () => {
-    await usingApi(async api => {
-      const collection = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collection, {nesting: {}});
-      const targetToken = await createItemExpectSuccess(alice, collection, 'NFT');
+  itSub('NFT: disallows to nest token if nesting is disabled', async ({helper}) => {
+    // Collection is implicitly not allowed nesting at creation
+    const collection = await helper.nft.mintCollection(alice);
+    const targetToken = await collection.mintToken(alice);
 
-      // Try to create a nested token
-      await expect(executeTransaction(api, alice, api.tx.unique.createItem(
-        collection,
-        {Ethereum: tokenIdToAddress(collection, targetToken)},
-          {nft: {}} as any,
-      )), 'while creating nested token').to.be.rejectedWith(/^common\.UserIsNotAllowedToNest$/);
+    // Try to create a nested token as token owner when it's disallowed
+    await expect(collection.mintToken(alice, targetToken.nestingAccount()))
+      .to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
 
-      // Create a token to be nested
-      const newToken = await createItemExpectSuccess(alice, collection, 'NFT');
-      // Try to nest
-      await expect(executeTransaction(api, alice, api.tx.unique.transfer({Ethereum: tokenIdToAddress(collection, targetToken)}, collection, newToken, 1)), 'while nesting new token').to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
-      expect(await getTopmostTokenOwner(api, collection, newToken)).to.be.deep.equal({Substrate: alice.address});
-      expect(await getTokenOwner(api, collection, newToken)).to.be.deep.equal({Substrate: alice.address});
-    });
+    // Try to create a token to be nested and nest
+    const newToken = await collection.mintToken(alice);
+    await expect(newToken.nest(alice, targetToken))
+      .to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
+
+    expect(await targetToken.getChildren()).to.be.length(0);
+    expect(await newToken.getOwner()).to.be.deep.equal({Substrate: alice.address});
   });
 
-  it('NFT: disallows a non-Owner to nest someone else\'s token', async () => {
-    await usingApi(async api => {
-      const collection = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collection, {nesting: {tokenOwner: true}});
+  itSub('NFT: disallows a non-Owner to nest someone else\'s token', async ({helper}) => {
+    const collection = await helper.nft.mintCollection(alice);
+    const targetToken = await collection.mintToken(alice);
 
-      await addToAllowListExpectSuccess(alice, collection, bob.address);
-      await enableAllowListExpectSuccess(alice, collection);
-      await enablePublicMintingExpectSuccess(alice, collection);
-
-      // Create a token to attempt to be nested into
-      const targetToken = await createItemExpectSuccess(bob, collection, 'NFT');
+    await collection.setPermissions(alice, {access: 'AllowList', mintMode: true, nesting: {tokenOwner: true}});
+    await collection.addToAllowList(alice, {Substrate: bob.address});
+    await collection.addToAllowList(alice, targetToken.nestingAccount());
 
-      // Try to create a nested token in the wrong collection
-      await expect(executeTransaction(api, alice, api.tx.unique.createItem(
-        collection,
-        {Ethereum: tokenIdToAddress(collection, targetToken)},
-          {nft: {}} as any,
-      )), 'while creating nested token').to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
+    // Try to create a token to be nested and nest
+    const newToken = await collection.mintToken(alice);
+    await expect(newToken.nest(bob, targetToken)).to.be.rejectedWith(/common\.NoPermission/);
 
-      // Try to create and nest a token in the wrong collection
-      const newToken = await createItemExpectSuccess(alice, collection, 'NFT');
-      await expect(executeTransaction(api, alice, api.tx.unique.transfer({Ethereum: tokenIdToAddress(collection, targetToken)}, collection, newToken, 1)), 'while nesting new token').to.be.rejectedWith(/common\.AddressNotInAllowlist/);
-      expect(await getTokenOwner(api, collection, newToken)).to.be.deep.equal({Substrate: alice.address});
-    });
+    expect(await targetToken.getChildren()).to.be.length(0);
+    expect(await newToken.getOwner()).to.be.deep.equal({Substrate: alice.address});
   });
 
-  it('NFT: disallows a non-Owner to nest someone else\'s token (Restricted nesting)', async () => {
-    await usingApi(async api => {
-      const collection = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collection, {nesting: {tokenOwner: true, restricted:[collection]}});
+  itSub('NFT: disallows a non-Owner to nest someone else\'s token (Restricted nesting)', async ({helper}) => {
+    const collection = await helper.nft.mintCollection(alice);
+    const targetToken = await collection.mintToken(alice);
 
-      await addToAllowListExpectSuccess(alice, collection, bob.address);
-      await enableAllowListExpectSuccess(alice, collection);
-      await enablePublicMintingExpectSuccess(alice, collection);
+    await collection.setPermissions(alice, {access: 'AllowList', mintMode: true, nesting: {tokenOwner: true}});
+    await collection.addToAllowList(alice, {Substrate: bob.address});
+    await collection.addToAllowList(alice, targetToken.nestingAccount());
 
-      // Create a token to attempt to be nested into
-      const targetToken = await createItemExpectSuccess(bob, collection, 'NFT');
+    const collectionB = await helper.nft.mintCollection(alice, {permissions: {access: 'AllowList', mintMode: true}});
+    await collectionB.addToAllowList(alice, {Substrate: bob.address});
+    await collectionB.addToAllowList(alice, targetToken.nestingAccount());
 
-      // Try to create a nested token in the wrong collection
-      await expect(executeTransaction(api, alice, api.tx.unique.createItem(
-        collection,
-        {Ethereum: tokenIdToAddress(collection, targetToken)},
-          {nft: {}} as any,
-      )), 'while creating nested token').to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
+    // Try to create a token to be nested and nest
+    const newToken = await collectionB.mintToken(alice);
+    await expect(newToken.nest(bob, targetToken)).to.be.rejectedWith(/common\.NoPermission/);
 
-      // Try to create and nest a token in the wrong collection
-      const newToken = await createItemExpectSuccess(alice, collection, 'NFT');
-      await expect(executeTransaction(api, alice, api.tx.unique.transfer({Ethereum: tokenIdToAddress(collection, targetToken)}, collection, newToken, 1)), 'while nesting new token').to.be.rejectedWith(/common\.AddressNotInAllowlist/);
-      expect(await getTokenOwner(api, collection, newToken)).to.be.deep.equal({Substrate: alice.address});
-    });
+    expect(await targetToken.getChildren()).to.be.length(0);
+    expect(await newToken.getOwner()).to.be.deep.equal({Substrate: alice.address});
   });
 
-  it('NFT: disallows to nest token in an unlisted collection', async () => {
-    await usingApi(async api => {
-      const collection = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collection, {nesting: {tokenOwner: true, restricted:[]}});
+  itSub('NFT: disallows to nest token in an unlisted collection', async ({helper}) => {
+    // Create collection with restricted nesting -- even self is not allowed
+    const collection = await helper.nft.mintCollection(alice, {permissions: {access: 'AllowList', mintMode: true, nesting: {tokenOwner: true, restricted: []}}});
+    const targetToken = await collection.mintToken(alice, {Substrate: bob.address});
 
-      // Create a token to attempt to be nested into
-      const targetToken = await createItemExpectSuccess(alice, collection, 'NFT');
+    await collection.addToAllowList(alice, {Substrate: bob.address});
+    await collection.addToAllowList(alice, targetToken.nestingAccount());
 
-      // Try to create a nested token in the wrong collection
-      await expect(executeTransaction(api, alice, api.tx.unique.createItem(
-        collection,
-        {Ethereum: tokenIdToAddress(collection, targetToken)},
-          {nft: {}} as any,
-      )), 'while creating nested token').to.be.rejectedWith(/common\.SourceCollectionIsNotAllowedToNest/);
-
-      // Try to create and nest a token in the wrong collection
-      const newToken = await createItemExpectSuccess(alice, collection, 'NFT');
-      await expect(executeTransaction(api, alice, api.tx.unique.transfer({Ethereum: tokenIdToAddress(collection, targetToken)}, collection, newToken, 1)), 'while nesting new token').to.be.rejectedWith(/common\.SourceCollectionIsNotAllowedToNest/);
-      expect(await getTokenOwner(api, collection, newToken)).to.be.deep.equal({Substrate: alice.address});
-    });
+    // Try to mint in own collection after allowlisting the accounts
+    await expect(collection.mintToken(bob, targetToken.nestingAccount()))
+      .to.be.rejectedWith(/common\.SourceCollectionIsNotAllowedToNest/);
   });
 
   // ---------- Fungible ----------
-
-  it('Fungible: disallows to nest token if nesting is disabled', async () => {
-    await usingApi(async api => {
-      const collectionNFT = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collectionNFT, {nesting: {}});
-      const targetToken = await createItemExpectSuccess(alice, collectionNFT, 'NFT');
-      const targetAddress = {Ethereum: tokenIdToAddress(collectionNFT, targetToken)};
-
-      const collectionFT = await createCollectionExpectSuccess({mode: {type: 'Fungible', decimalPoints: 0}});
 
-      // Try to create a nested token
-      await expect(executeTransaction(api, alice, api.tx.unique.createItem(
-        collectionFT,
-        targetAddress,
-        {Fungible: {Value: 10}},
-      )), 'while creating nested token').to.be.rejectedWith(/^common\.UserIsNotAllowedToNest$/);
+  itSub('Fungible: disallows to nest token if nesting is disabled', async ({helper}) => {
+    const collectionNFT = await helper.nft.mintCollection(alice);
+    const collectionFT = await helper.ft.mintCollection(alice);
+    const targetToken = await collectionNFT.mintToken(alice);
 
-      // Create a token to be nested
-      const newToken = await createItemExpectSuccess(alice, collectionFT, 'Fungible');
-      // Try to nest
-      await expect(executeTransaction(api, alice, api.tx.unique.transfer(targetAddress, collectionFT, newToken, 1)), 'while nesting new token').to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
+    // Try to create an immediately nested token
+    await expect(collectionFT.mint(alice, 5n, targetToken.nestingAccount()))
+      .to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
 
-      // Create another token to be nested
-      const newToken2 = await createItemExpectSuccess(alice, collectionFT, 'Fungible');
-      // Try to nest inside a fungible token
-      await expect(executeTransaction(api, alice, api.tx.unique.transfer({Ethereum: tokenIdToAddress(collectionFT, newToken)}, collectionFT, newToken2, 1)), 'while nesting new token inside fungible').to.be.rejectedWith(/fungible\.FungibleDisallowsNesting/);
-    });
+    // Try to create a token to be nested and nest
+    await collectionFT.mint(alice, 5n);
+    await expect(collectionFT.transfer(alice, targetToken.nestingAccount(), 2n))
+      .to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
+    expect(await collectionFT.getBalance({Substrate: alice.address})).to.be.equal(5n);
   });
 
-  it('Fungible: disallows a non-Owner to nest someone else\'s token', async () => {
-    await usingApi(async api => {
-      const collectionNFT = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collectionNFT, {nesting: {tokenOwner: true}});
+  itSub('Fungible: disallows a non-Owner to unnest someone else\'s token', async ({helper}) => {
+    const collectionNFT = await helper.nft.mintCollection(alice, {permissions: {nesting: {collectionAdmin: true, tokenOwner: true}}});
+    const collectionFT = await helper.ft.mintCollection(alice);
+    const targetToken = await collectionNFT.mintToken(alice, {Substrate: bob.address});
 
-      await addToAllowListExpectSuccess(alice, collectionNFT, bob.address);
-      await enableAllowListExpectSuccess(alice, collectionNFT);
-      await enablePublicMintingExpectSuccess(alice, collectionNFT);
+    // Nest some tokens as Alice into Bob's token
+    await collectionFT.mint(alice, 5n, targetToken.nestingAccount());
 
-      // Create a token to attempt to be nested into
-      const targetToken = await createItemExpectSuccess(bob, collectionNFT, 'NFT');
-      const targetAddress = {Ethereum: tokenIdToAddress(collectionNFT, targetToken)};
-
-      const collectionFT = await createCollectionExpectSuccess({mode: {type: 'Fungible', decimalPoints: 0}});
-
-      // Try to create a nested token in the wrong collection
-      await expect(executeTransaction(api, alice, api.tx.unique.createItem(
-        collectionFT,
-        targetAddress,
-        {Fungible: {Value: 10}},
-      )), 'while creating nested token').to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
-
-      // Try to create and nest a token in the wrong collection
-      const newToken = await createItemExpectSuccess(alice, collectionFT, 'Fungible');
-      await expect(executeTransaction(api, alice, api.tx.unique.transfer(targetAddress, collectionFT, newToken, 1)), 'while nesting new token').to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
-    });
+    // Try to pull it out
+    await expect(collectionFT.transferFrom(alice, targetToken.nestingAccount(), {Substrate: bob.address}, 1n))
+      .to.be.rejectedWith(/common\.ApprovedValueTooLow/);
+    expect(await collectionFT.getBalance(targetToken.nestingAccount())).to.be.equal(5n);
   });
 
-  it('Fungible: disallows a non-Owner to nest someone else\'s token (Restricted nesting)', async () => {
-    await usingApi(async api => {
-      const collectionNFT = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await addToAllowListExpectSuccess(alice, collectionNFT, bob.address);
-      await enableAllowListExpectSuccess(alice, collectionNFT);
-      await enablePublicMintingExpectSuccess(alice, collectionNFT);
-
-      // Create a token to attempt to be nested into
-      const targetToken = await createItemExpectSuccess(bob, collectionNFT, 'NFT');
-      const targetAddress = {Ethereum: tokenIdToAddress(collectionNFT, targetToken)};
+  itSub('Fungible: disallows a non-Owner to unnest someone else\'s token (Restricted nesting)', async ({helper}) => {
+    const collectionNFT = await helper.nft.mintCollection(alice);
+    const collectionFT = await helper.ft.mintCollection(alice);
+    const targetToken = await collectionNFT.mintToken(alice, {Substrate: bob.address});
 
-      const collectionFT = await createCollectionExpectSuccess({mode: {type: 'Fungible', decimalPoints: 0}});
-      await setCollectionPermissionsExpectSuccess(alice, collectionNFT, {nesting: {tokenOwner: true, restricted:[collectionFT]}});
+    await collectionNFT.setPermissions(alice, {nesting: {collectionAdmin: true, tokenOwner: true, restricted: [collectionFT.collectionId]}});
 
-      // Try to create a nested token in the wrong collection
-      await expect(executeTransaction(api, alice, api.tx.unique.createItem(
-        collectionFT,
-        targetAddress,
-        {Fungible: {Value: 10}},
-      )), 'while creating nested token').to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
+    // Nest some tokens as Alice into Bob's token
+    await collectionFT.mint(alice, 5n, targetToken.nestingAccount());
 
-      // Try to create and nest a token in the wrong collection
-      const newToken = await createItemExpectSuccess(alice, collectionFT, 'Fungible');
-      await expect(executeTransaction(api, alice, api.tx.unique.transfer(targetAddress, collectionFT, newToken, 1)), 'while nesting new token').to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
-    });
+    // Try to pull it out as Alice still
+    await expect(collectionFT.transferFrom(alice, targetToken.nestingAccount(), {Substrate: bob.address}, 1n))
+      .to.be.rejectedWith(/common\.ApprovedValueTooLow/);
+    expect(await collectionFT.getBalance(targetToken.nestingAccount())).to.be.equal(5n);
   });
 
-  it('Fungible: disallows to nest token in an unlisted collection', async () => {
-    await usingApi(async api => {
-      const collectionNFT = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collectionNFT, {nesting: {tokenOwner: true, restricted:[]}});
-
-      // Create a token to attempt to be nested into
-      const targetToken = await createItemExpectSuccess(alice, collectionNFT, 'NFT');
-      const targetAddress = {Ethereum: tokenIdToAddress(collectionNFT, targetToken)};
+  itSub('Fungible: disallows to nest token in an unlisted collection', async ({helper}) => {
+    const collectionNFT = await helper.nft.mintCollection(alice, {permissions: {nesting: {collectionAdmin: true, tokenOwner: true, restricted: []}}});
+    const collectionFT = await helper.ft.mintCollection(alice);
+    const targetToken = await collectionNFT.mintToken(alice);
 
-      const collectionFT = await createCollectionExpectSuccess({mode: {type: 'Fungible', decimalPoints: 0}});
+    // Try to mint an immediately nested token
+    await expect(collectionFT.mint(alice, 5n, targetToken.nestingAccount()))
+      .to.be.rejectedWith(/common\.SourceCollectionIsNotAllowedToNest/);
 
-      // Try to create a nested token in the wrong collection
-      await expect(executeTransaction(api, alice, api.tx.unique.createItem(
-        collectionFT,
-        targetAddress,
-        {Fungible: {Value: 10}},
-      )), 'while creating a nested token').to.be.rejectedWith(/common\.SourceCollectionIsNotAllowedToNest/);
+    // Mint a token and try to nest it
+    await collectionFT.mint(alice, 5n);
+    await expect(collectionFT.transfer(alice, targetToken.nestingAccount(), 1n))
+      .to.be.rejectedWith(/common\.SourceCollectionIsNotAllowedToNest/);
 
-      // Try to create and nest a token in the wrong collection
-      const newToken = await createItemExpectSuccess(alice, collectionFT, 'Fungible');
-      await expect(executeTransaction(api, alice, api.tx.unique.transfer(targetAddress, collectionFT, newToken, 1)), 'while nesting new token').to.be.rejectedWith(/common\.SourceCollectionIsNotAllowedToNest/);
-    });
+    expect(await collectionFT.getBalance(targetToken.nestingAccount())).to.be.equal(0n);
+    expect(await collectionFT.getBalance({Substrate: alice.address})).to.be.equal(5n);
   });
 
   // ---------- Re-Fungible ----------
-
-  it('ReFungible: disallows to nest token if nesting is disabled', async function() {
-    await requirePallets(this, [Pallets.ReFungible]);
 
-    await usingApi(async api => {
-      const collectionNFT = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collectionNFT, {nesting: {}});
-      const targetToken = await createItemExpectSuccess(alice, collectionNFT, 'NFT');
-      const targetAddress = {Ethereum: tokenIdToAddress(collectionNFT, targetToken)};
-
-      const collectionRFT = await createCollectionExpectSuccess({mode: {type: 'ReFungible'}});
-
-      // Create a nested token
-      await expect(executeTransaction(api, alice, api.tx.unique.createItem(
-        collectionRFT,
-        targetAddress,
-        {ReFungible: {pieces: 100}},
-      )), 'while creating a nested token').to.be.rejectedWith(/^common\.UserIsNotAllowedToNest$/);
+  itSub.ifWithPallets('ReFungible: disallows to nest token if nesting is disabled', [Pallets.ReFungible], async ({helper}) => {
+    const collectionNFT = await helper.nft.mintCollection(alice);
+    const collectionRFT = await helper.rft.mintCollection(alice);
+    const targetToken = await collectionNFT.mintToken(alice);
 
-      // Create a token to be nested
-      const newToken = await createItemExpectSuccess(alice, collectionRFT, 'ReFungible');
-      // Try to nest
-      await transferExpectFailure(collectionRFT, newToken, alice, targetAddress, 100);
-      // Try to nest
-      await expect(executeTransaction(api, alice, api.tx.unique.transfer(targetAddress, collectionRFT, newToken, 1)), 'while nesting new token').to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
+    // Try to create an immediately nested token
+    await expect(collectionRFT.mintToken(alice, 5n, targetToken.nestingAccount()))
+      .to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
 
-      // Create another token to be nested
-      const newToken2 = await createItemExpectSuccess(alice, collectionRFT, 'ReFungible');
-      // Try to nest inside a fungible token
-      await expect(executeTransaction(api, alice, api.tx.unique.transfer({Ethereum: tokenIdToAddress(collectionRFT, newToken)}, collectionRFT, newToken2, 1)), 'while nesting new token inside refungible').to.be.rejectedWith(/refungible\.RefungibleDisallowsNesting/);
-    });
+    // Try to create a token to be nested and nest
+    const token = await collectionRFT.mintToken(alice, 5n);
+    await expect(token.transfer(alice, targetToken.nestingAccount(), 2n))
+      .to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
+    expect(await token.getBalance({Substrate: alice.address})).to.be.equal(5n);
   });
-
-  it('ReFungible: disallows a non-Owner to nest someone else\'s token', async function() {
-    await requirePallets(this, [Pallets.ReFungible]);
 
-    await usingApi(async api => {
-      const collectionNFT = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collectionNFT, {nesting: {tokenOwner: true}});
+  itSub.ifWithPallets('ReFungible: disallows a non-Owner to nest someone else\'s token', [Pallets.ReFungible], async ({helper}) => {
+    const collectionNFT = await helper.nft.mintCollection(alice);
+    const collectionRFT = await helper.rft.mintCollection(alice);
+    const targetToken = await collectionNFT.mintToken(alice);
 
-      await addToAllowListExpectSuccess(alice, collectionNFT, bob.address);
-      await enableAllowListExpectSuccess(alice, collectionNFT);
-      await enablePublicMintingExpectSuccess(alice, collectionNFT);
+    await collectionNFT.setPermissions(alice, {access: 'AllowList', mintMode: true, nesting: {tokenOwner: true}});
+    await collectionNFT.addToAllowList(alice, {Substrate: bob.address});
+    await collectionNFT.addToAllowList(alice, targetToken.nestingAccount());
 
-      // Create a token to attempt to be nested into
-      const targetToken = await createItemExpectSuccess(bob, collectionNFT, 'NFT');
-      const targetAddress = {Ethereum: tokenIdToAddress(collectionNFT, targetToken)};
+    // Try to create a token to be nested and nest
+    const newToken = await collectionRFT.mintToken(alice);
+    await expect(newToken.transfer(bob, targetToken.nestingAccount())).to.be.rejectedWith(/common\.TokenValueTooLow/);
 
-      const collectionRFT = await createCollectionExpectSuccess({mode: {type: 'ReFungible'}});
+    expect(await targetToken.getChildren()).to.be.length(0);
+    expect(await newToken.getBalance({Substrate: alice.address})).to.be.equal(1n);
 
-      // Try to create a nested token in the wrong collection
-      await expect(executeTransaction(api, alice, api.tx.unique.createItem(
-        collectionRFT,
-        targetAddress,
-        {ReFungible: {pieces: 100}},
-      )), 'while creating a nested token').to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
+    // Nest some tokens as Alice into Bob's token
+    await newToken.transfer(alice, targetToken.nestingAccount());
 
-      // Try to create and nest a token in the wrong collection
-      const newToken = await createItemExpectSuccess(alice, collectionRFT, 'ReFungible');
-      await expect(executeTransaction(api, alice, api.tx.unique.transfer(targetAddress, collectionRFT, newToken, 1)), 'while nesting new token').to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
-    });
+    // Try to pull it out
+    await expect(newToken.transferFrom(bob, targetToken.nestingAccount(), {Substrate: alice.address}, 1n))
+      .to.be.rejectedWith(/common\.ApprovedValueTooLow/);
+    expect(await newToken.getBalance(targetToken.nestingAccount())).to.be.equal(1n);
   });
 
-  it('ReFungible: disallows a non-Owner to nest someone else\'s token (Restricted nesting)', async function() {
-    await requirePallets(this, [Pallets.ReFungible]);
+  itSub.ifWithPallets('ReFungible: disallows a non-Owner to nest someone else\'s token (Restricted nesting)', [Pallets.ReFungible], async ({helper}) => {
+    const collectionNFT = await helper.nft.mintCollection(alice);
+    const collectionRFT = await helper.rft.mintCollection(alice);
+    const targetToken = await collectionNFT.mintToken(alice);
 
-    await usingApi(async api => {
-      const collectionNFT = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await addToAllowListExpectSuccess(alice, collectionNFT, bob.address);
-      await enableAllowListExpectSuccess(alice, collectionNFT);
-      await enablePublicMintingExpectSuccess(alice, collectionNFT);
+    await collectionNFT.setPermissions(alice, {access: 'AllowList', mintMode: true, nesting: {tokenOwner: true, restricted: [collectionRFT.collectionId]}});
+    await collectionNFT.addToAllowList(alice, {Substrate: bob.address});
+    await collectionNFT.addToAllowList(alice, targetToken.nestingAccount());
 
-      // Create a token to attempt to be nested into
-      const targetToken = await createItemExpectSuccess(bob, collectionNFT, 'NFT');
-      const targetAddress = {Ethereum: tokenIdToAddress(collectionNFT, targetToken)};
+    // Try to create a token to be nested and nest
+    const newToken = await collectionRFT.mintToken(alice);
+    await expect(newToken.transfer(bob, targetToken.nestingAccount())).to.be.rejectedWith(/common\.TokenValueTooLow/);
 
-      const collectionRFT = await createCollectionExpectSuccess({mode: {type: 'ReFungible'}});
-      await setCollectionPermissionsExpectSuccess(alice, collectionNFT, {nesting: {tokenOwner: true, restricted:[collectionRFT]}});
+    expect(await targetToken.getChildren()).to.be.length(0);
+    expect(await newToken.getBalance({Substrate: alice.address})).to.be.equal(1n);
 
-      // Try to create a nested token in the wrong collection
-      await expect(executeTransaction(api, alice, api.tx.unique.createItem(
-        collectionRFT,
-        targetAddress,
-        {ReFungible: {pieces: 100}},
-      )), 'while creating a nested token').to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
+    // Nest some tokens as Alice into Bob's token
+    await newToken.transfer(alice, targetToken.nestingAccount());
 
-      // Try to create and nest a token in the wrong collection
-      const newToken = await createItemExpectSuccess(alice, collectionRFT, 'ReFungible');
-      await expect(executeTransaction(api, alice, api.tx.unique.transfer(targetAddress, collectionRFT, newToken, 1)), 'while nesting new token').to.be.rejectedWith(/common\.UserIsNotAllowedToNest/);
-    });
+    // Try to pull it out
+    await expect(newToken.transferFrom(bob, targetToken.nestingAccount(), {Substrate: alice.address}, 1n))
+      .to.be.rejectedWith(/common\.ApprovedValueTooLow/);
+    expect(await newToken.getBalance(targetToken.nestingAccount())).to.be.equal(1n);
   });
 
-  it('ReFungible: disallows to nest token to an unlisted collection', async function() {
-    await requirePallets(this, [Pallets.ReFungible]);
+  itSub.ifWithPallets('ReFungible: disallows to nest token to an unlisted collection', [Pallets.ReFungible], async ({helper}) => {
+    const collectionNFT = await helper.nft.mintCollection(alice, {permissions: {nesting: {tokenOwner: true, restricted: []}}});
+    const collectionRFT = await helper.rft.mintCollection(alice);
+    const targetToken = await collectionNFT.mintToken(alice);
 
-    await usingApi(async api => {
-      const collectionNFT = await createCollectionExpectSuccess({mode: {type: 'NFT'}});
-      await setCollectionPermissionsExpectSuccess(alice, collectionNFT, {nesting: {tokenOwner: true, restricted:[]}});
+    // Try to create an immediately nested token
+    await expect(collectionRFT.mintToken(alice, 5n, targetToken.nestingAccount()))
+      .to.be.rejectedWith(/common\.SourceCollectionIsNotAllowedToNest/);
 
-      // Create a token to attempt to be nested into
-      const targetToken = await createItemExpectSuccess(alice, collectionNFT, 'NFT');
-      const targetAddress = {Ethereum: tokenIdToAddress(collectionNFT, targetToken)};
-
-      const collectionRFT = await createCollectionExpectSuccess({mode: {type: 'ReFungible'}});
-
-      // Try to create a nested token in the wrong collection
-      await expect(executeTransaction(api, alice, api.tx.unique.createItem(
-        collectionRFT,
-        targetAddress,
-        {ReFungible: {pieces: 100}},
-      )), 'while creating a nested token').to.be.rejectedWith(/common\.SourceCollectionIsNotAllowedToNest/);
-
-      // Try to create and nest a token in the wrong collection
-      const newToken = await createItemExpectSuccess(alice, collectionRFT, 'ReFungible');
-      await expect(executeTransaction(api, alice, api.tx.unique.transfer(targetAddress, collectionRFT, newToken, 1)), 'while nesting new token').to.be.rejectedWith(/common\.SourceCollectionIsNotAllowedToNest/);
-    });
+    // Try to create a token to be nested and nest
+    const token = await collectionRFT.mintToken(alice, 5n);
+    await expect(token.transfer(alice, targetToken.nestingAccount(), 2n))
+      .to.be.rejectedWith(/common\.SourceCollectionIsNotAllowedToNest/);
+    expect(await token.getBalance({Substrate: alice.address})).to.be.equal(5n);
   });
 });