git.delta.rocks / unique-network / refs/commits / 24d3f67bfdff

--- a/pallets/common/src/erc.rs
+++ b/pallets/common/src/erc.rs
@@ -28,8 +28,8 @@
 use sp_std::{vec, vec::Vec};
 use sp_core::U256;
 use up_data_structs::{
-	AccessMode, CollectionMode, CollectionPermissions, OwnerRestrictedSet, Property,
-	SponsoringRateLimit, SponsorshipState,
+	CollectionMode, CollectionPermissions, OwnerRestrictedSet, Property, SponsoringRateLimit,
+	SponsorshipState,
 };
 
 use crate::{

--- a/pallets/common/src/eth.rs
+++ b/pallets/common/src/eth.rs
@@ -80,10 +80,7 @@
 		if cross_account_id.is_canonical_substrate() {
 			Self::from_sub::<T>(cross_account_id.as_sub())
 		} else {
-			Self {
-				eth: *cross_account_id.as_eth(),
-				sub: Default::default(),
-			}
+			Self::from_eth(*cross_account_id.as_eth())
 		}
 	}
 	/// Creates [`CrossAddress`] from Substrate account.
@@ -97,6 +94,13 @@
 			sub: U256::from_big_endian(account_id.as_ref()),
 		}
 	}
+	/// Creates [`CrossAddress`] from Ethereum account.
+	pub fn from_eth(address: Address) -> Self {
+		Self {
+			eth: address,
+			sub: Default::default(),
+		}
+	}
 	/// Converts [`CrossAddress`] to `CrossAccountId`.
 	pub fn into_sub_cross_account<T>(&self) -> evm_coder::execution::Result<T::CrossAccountId>
 	where

--- a/pallets/common/src/lib.rs
+++ b/pallets/common/src/lib.rs
@@ -100,6 +100,7 @@
 	PropertyValue,
 	PropertyPermission,
 	PropertiesError,
+	TokenOwnerError,
 	PropertyKeyPermission,
 	TokenData,
 	TrySetProperty,
@@ -2134,7 +2135,7 @@
 	/// Get the owner of the token.
 	///
 	/// * `token` - The token for which you need to find out the owner.
-	fn token_owner(&self, token: TokenId) -> Option<T::CrossAccountId>;
+	fn token_owner(&self, token: TokenId) -> Result<T::CrossAccountId, TokenOwnerError>;
 
 	/// Returns 10 tokens owners in no particular order.
 	///

--- a/pallets/fungible/src/common.rs
+++ b/pallets/fungible/src/common.rs
@@ -17,7 +17,9 @@
 use core::marker::PhantomData;
 
 use frame_support::{dispatch::DispatchResultWithPostInfo, ensure, fail, weights::Weight, traits::Get};
-use up_data_structs::{TokenId, CollectionId, CreateItemExData, budget::Budget, CreateItemData};
+use up_data_structs::{
+	TokenId, CollectionId, CreateItemExData, budget::Budget, CreateItemData, TokenOwnerError,
+};
 use pallet_common::{
 	CommonCollectionOperations, CommonWeightInfo, RefungibleExtensions, with_weight,
 	weights::WeightInfo as _,
@@ -404,8 +406,8 @@
 		TokenId::default()
 	}
 
-	fn token_owner(&self, _token: TokenId) -> Option<T::CrossAccountId> {
-		None
+	fn token_owner(&self, _token: TokenId) -> Result<T::CrossAccountId, TokenOwnerError> {
+		Err(TokenOwnerError::MultipleOwners)
 	}
 
 	/// Returns 10 tokens owners in no particular order.

--- a/pallets/nonfungible/src/common.rs
+++ b/pallets/nonfungible/src/common.rs
@@ -19,7 +19,7 @@
 use frame_support::{dispatch::DispatchResultWithPostInfo, ensure, fail, weights::Weight};
 use up_data_structs::{
 	TokenId, CreateItemExData, CollectionId, budget::Budget, Property, PropertyKey,
-	PropertyKeyPermission, PropertyValue,
+	PropertyKeyPermission, PropertyValue, TokenOwnerError,
 };
 use pallet_common::{
 	CommonCollectionOperations, CommonWeightInfo, RefungibleExtensions, with_weight,
@@ -460,13 +460,15 @@
 		TokenId(<TokensMinted<T>>::get(self.id))
 	}
 
-	fn token_owner(&self, token: TokenId) -> Option<T::CrossAccountId> {
-		<TokenData<T>>::get((self.id, token)).map(|t| t.owner)
+	fn token_owner(&self, token: TokenId) -> Result<T::CrossAccountId, TokenOwnerError> {
+		<TokenData<T>>::get((self.id, token))
+			.map(|t| t.owner)
+			.ok_or(TokenOwnerError::NotFound)
 	}
 
 	/// Returns token owners.
 	fn token_owners(&self, token: TokenId) -> Vec<T::CrossAccountId> {
-		self.token_owner(token).map_or_else(|| vec![], |t| vec![t])
+		self.token_owner(token).map_or_else(|_| vec![], |t| vec![t])
 	}
 
 	fn token_property(&self, token_id: TokenId, key: &PropertyKey) -> Option<PropertyValue> {

--- a/pallets/nonfungible/src/erc.rs
+++ b/pallets/nonfungible/src/erc.rs
@@ -728,7 +728,7 @@
 	fn cross_owner_of(&self, token_id: U256) -> Result<eth::CrossAddress> {
 		Self::token_owner(&self, token_id.try_into()?)
 			.map(|o| eth::CrossAddress::from_sub_cross_account::<T>(&o))
-			.ok_or(Error::Revert("key too large".into()))
+			.map_err(|_| Error::Revert("token not found".into()))
 	}
 
 	/// Returns the token properties.

--- a/pallets/proxy-rmrk-core/src/lib.rs
+++ b/pallets/proxy-rmrk-core/src/lib.rs
@@ -741,7 +741,8 @@
 						Some((collection_id, nft_id)),
 						&target_nft_budget,
 					)
-					.map_err(Self::map_unique_err_to_proxy)?;
+					.map_err(Self::map_unique_err_to_proxy)?
+					.ok_or::<DispatchError>(<Error<T>>::NoPermission.into())?;
 
 					approval_required = cross_sender != target_nft_owner;
 
@@ -989,7 +990,8 @@
 
 			let nft_owner =
 				<PalletStructure<T>>::find_topmost_owner(collection_id, nft_id, &budget)
-					.map_err(|_| <Error<T>>::ResourceDoesntExist)?;
+					.map_err(|_| <Error<T>>::ResourceDoesntExist)?
+					.ok_or::<DispatchError>(<Error<T>>::NoPermission.into())?;
 
 			Self::try_mutate_resource_info(collection_id, nft_id, resource_id, |res| {
 				ensure!(res.pending, <Error<T>>::ResourceNotPending);
@@ -1044,7 +1046,8 @@
 
 			let nft_owner =
 				<PalletStructure<T>>::find_topmost_owner(collection_id, nft_id, &budget)
-					.map_err(|_| <Error<T>>::ResourceDoesntExist)?;
+					.map_err(|_| <Error<T>>::ResourceDoesntExist)?
+					.ok_or::<DispatchError>(<Error<T>>::NoPermission.into())?;
 
 			ensure!(cross_sender == nft_owner, <Error<T>>::NoPermission);
 
@@ -1666,7 +1669,8 @@
 		let budget = budget::Value::new(NESTING_BUDGET);
 
 		let nft_owner = <PalletStructure<T>>::find_topmost_owner(collection_id, nft_id, &budget)
-			.map_err(Self::map_unique_err_to_proxy)?;
+			.map_err(Self::map_unique_err_to_proxy)?
+			.ok_or::<DispatchError>(<Error<T>>::NoPermission.into())?;
 
 		let pending = sender != nft_owner;
 
@@ -1720,7 +1724,8 @@
 
 		let budget = up_data_structs::budget::Value::new(NESTING_BUDGET);
 		let topmost_owner =
-			<PalletStructure<T>>::find_topmost_owner(collection_id, nft_id, &budget)?;
+			<PalletStructure<T>>::find_topmost_owner(collection_id, nft_id, &budget)?
+				.ok_or::<DispatchError>(<Error<T>>::NoPermission.into())?;
 
 		let sender = T::CrossAccountId::from_sub(sender);
 		if topmost_owner == sender {

--- a/pallets/proxy-rmrk-core/src/rpc.rs
+++ b/pallets/proxy-rmrk-core/src/rpc.rs
@@ -68,7 +68,7 @@
 	}
 
 	let owner = match collection.token_owner(nft_id) {
-		Some(owner) => match T::CrossTokenAddressMapping::address_to_token(&owner) {
+		Ok(owner) => match T::CrossTokenAddressMapping::address_to_token(&owner) {
 			Some((col, tok)) => {
 				let rmrk_collection = <Pallet<T>>::rmrk_collection_id(col)?;
 
@@ -76,7 +76,7 @@
 			}
 			None => RmrkAccountIdOrCollectionNftTuple::AccountId(owner.as_sub().clone()),
 		},
-		None => return Ok(None),
+		_ => return Ok(None),
 	};
 
 	Ok(Some(RmrkInstanceInfo {

--- a/pallets/refungible/src/common.rs
+++ b/pallets/refungible/src/common.rs
@@ -21,7 +21,7 @@
 use up_data_structs::{
 	CollectionId, TokenId, CreateItemExData, budget::Budget, Property, PropertyKey, PropertyValue,
 	PropertyKeyPermission, CollectionPropertiesVec, CreateRefungibleExMultipleOwners,
-	CreateRefungibleExSingleOwner,
+	CreateRefungibleExSingleOwner, TokenOwnerError,
 };
 use pallet_common::{
 	CommonCollectionOperations, CommonWeightInfo, RefungibleExtensions, with_weight,
@@ -478,7 +478,7 @@
 		TokenId(<TokensMinted<T>>::get(self.id))
 	}
 
-	fn token_owner(&self, token: TokenId) -> Option<T::CrossAccountId> {
+	fn token_owner(&self, token: TokenId) -> Result<T::CrossAccountId, TokenOwnerError> {
 		<Pallet<T>>::token_owner(self.id, token)
 	}
 

--- a/pallets/refungible/src/erc.rs
+++ b/pallets/refungible/src/erc.rs
@@ -43,7 +43,7 @@
 use sp_std::{collections::btree_map::BTreeMap, vec::Vec, vec};
 use up_data_structs::{
 	CollectionId, CollectionPropertiesVec, mapping::TokenAddressMapping, Property, PropertyKey,
-	PropertyKeyPermission, PropertyPermission, TokenId,
+	PropertyKeyPermission, PropertyPermission, TokenId, TokenOwnerError,
 };
 
 use crate::{
@@ -411,9 +411,12 @@
 		self.consume_store_reads(2)?;
 		let token = token_id.try_into()?;
 		let owner = <Pallet<T>>::token_owner(self.id, token);
-		Ok(owner
+		owner
 			.map(|address| *address.as_eth())
-			.unwrap_or_else(|| ADDRESS_FOR_PARTIALLY_OWNED_TOKENS))
+			.or_else(|err| match err {
+				TokenOwnerError::NotFound => Err(Error::Revert("token not found".into())),
+				TokenOwnerError::MultipleOwners => Ok(ADDRESS_FOR_PARTIALLY_OWNED_TOKENS),
+			})
 	}
 
 	/// @dev Not implemented
@@ -766,7 +769,12 @@
 	fn cross_owner_of(&self, token_id: U256) -> Result<eth::CrossAddress> {
 		Self::token_owner(&self, token_id.try_into()?)
 			.map(|o| eth::CrossAddress::from_sub_cross_account::<T>(&o))
-			.ok_or(Error::Revert("key too large".into()))
+			.or_else(|err| match err {
+				TokenOwnerError::NotFound => Err(Error::Revert("token not found".into())),
+				TokenOwnerError::MultipleOwners => Ok(eth::CrossAddress::from_eth(
+					ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,
+				)),
+			})
 	}
 
 	/// Returns the token properties.

--- a/pallets/refungible/src/lib.rs
+++ b/pallets/refungible/src/lib.rs
@@ -107,7 +107,7 @@
 	AccessMode, budget::Budget, CollectionId, CollectionFlags, CreateCollectionData,
 	mapping::TokenAddressMapping, MAX_REFUNGIBLE_PIECES, Property, PropertyKey,
 	PropertyKeyPermission, PropertyPermission, PropertyScope, PropertyValue, TokenId,
-	TrySetProperty, PropertiesPermissionMap, CreateRefungibleExMultipleOwners,
+	TrySetProperty, PropertiesPermissionMap, CreateRefungibleExMultipleOwners, TokenOwnerError,
 };
 
 pub use pallet::*;
@@ -480,7 +480,7 @@
 			<Balance<T>>::remove((collection.id, token, owner));
 			<AccountBalance<T>>::insert((collection.id, owner), account_balance);
 
-			if let Some(user) = Self::token_owner(collection.id, token) {
+			if let Ok(user) = Self::token_owner(collection.id, token) {
 				<PalletEvm<T>>::deposit_log(
 					ERC721Events::Transfer {
 						from: erc::ADDRESS_FOR_PARTIALLY_OWNED_TOKENS,
@@ -1365,17 +1365,20 @@
 		Ok(())
 	}
 
-	fn token_owner(collection_id: CollectionId, token_id: TokenId) -> Option<T::CrossAccountId> {
+	fn token_owner(
+		collection_id: CollectionId,
+		token_id: TokenId,
+	) -> Result<T::CrossAccountId, TokenOwnerError> {
 		let mut owner = None;
 		let mut count = 0;
 		for key in Balance::<T>::iter_key_prefix((collection_id, token_id)) {
 			count += 1;
 			if count > 1 {
-				return None;
+				return Err(TokenOwnerError::MultipleOwners);
 			}
 			owner = Some(key);
 		}
-		owner
+		owner.ok_or(TokenOwnerError::NotFound)
 	}
 
 	fn total_pieces(collection_id: CollectionId, token_id: TokenId) -> Option<u128> {

62pub use pallet::*;62pub use pallet::*;
63use pallet_common::{dispatch::CollectionDispatch, CollectionHandle};63use pallet_common::{dispatch::CollectionDispatch, CollectionHandle};
64use up_data_structs::{CollectionId, TokenId, mapping::TokenAddressMapping, budget::Budget};64use up_data_structs::{
65	CollectionId, TokenId, mapping::TokenAddressMapping, budget::Budget, TokenOwnerError,
66};
6567
66#[cfg(feature = "runtime-benchmarks")]68#[cfg(feature = "runtime-benchmarks")]
135	User(CrossAccountId),137	User(CrossAccountId),
136	/// Could not find the token provided as the owner.138	/// Could not find the token provided as the owner.
137	TokenNotFound,139	TokenNotFound,
140	/// Nested token has multiple owners.
141	MultipleOwners,
138	/// Token owner is another token (still, the target token may not exist).142	/// Token owner is another token (still, the target token may not exist).
139	Token(CollectionId, TokenId),143	Token(CollectionId, TokenId),
140}144}
159		let handle = handle.as_dyn();163		let handle = handle.as_dyn();
160164
161		Ok(match handle.token_owner(token) {165		Ok(match handle.token_owner(token) {
162			Some(owner) => match T::CrossTokenAddressMapping::address_to_token(&owner) {166			Ok(owner) => match T::CrossTokenAddressMapping::address_to_token(&owner) {
163				Some((collection, token)) => Parent::Token(collection, token),167				Some((collection, token)) => Parent::Token(collection, token),
164				None => Parent::User(owner),168				None => Parent::User(owner),
165			},169			},
170			Err(TokenOwnerError::MultipleOwners) => Parent::MultipleOwners,
166			None => Parent::TokenNotFound,171			Err(TokenOwnerError::NotFound) => Parent::TokenNotFound,
167		})172		})
168	}173	}
169174
202	/// Try to dereference address, until finding top level owner207	/// Try to dereference address, until finding top level owner
203	///208	///
204	/// May return token address if parent token not yet exists209	/// May return token address if parent token not yet exists
210	///
211	/// Returns `None` if the token has multiple owners.
205	///212	///
206	/// - `budget`: Limit for searching parents in depth.213	/// - `budget`: Limit for searching parents in depth.
207	pub fn find_topmost_owner(214	pub fn find_topmost_owner(
208		collection: CollectionId,215		collection: CollectionId,
209		token: TokenId,216		token: TokenId,
210		budget: &dyn Budget,217		budget: &dyn Budget,
211	) -> Result<T::CrossAccountId, DispatchError> {218	) -> Result<Option<T::CrossAccountId>, DispatchError> {
212		let owner = Self::parent_chain(collection, token)219		let owner = Self::parent_chain(collection, token)
213			.take_while(|_| budget.consume())220			.take_while(|_| budget.consume())
214			.find(|p| matches!(p, Ok(Parent::User(_) | Parent::TokenNotFound)))221			.find(|p| {
222				matches!(
223					p,
224					Ok(Parent::User(_) | Parent::TokenNotFound | Parent::MultipleOwners)
225				)
226			})
215			.ok_or(<Error<T>>::DepthLimit)??;227			.ok_or(<Error<T>>::DepthLimit)??;
216228
217		Ok(match owner {229		Ok(match owner {
218			Parent::User(v) => v,230			Parent::User(v) => Some(v),
231			Parent::MultipleOwners => None,
219			_ => fail!(<Error<T>>::TokenNotFound),232			_ => fail!(<Error<T>>::TokenNotFound),
220		})233		})
221	}234	}
222235
223	/// Find the topmost parent and check that assigning `for_nest` token as a child for236	/// Find the topmost parent and check that assigning `for_nest` token as a child for
224	/// `token` wouldn't create a cycle.237	/// `token` wouldn't create a cycle.
238	///
239	/// Returns `None` if the token has multiple owners.
225	///240	///
226	/// - `budget`: Limit for searching parents in depth.241	/// - `budget`: Limit for searching parents in depth.
227	pub fn get_checked_topmost_owner(242	pub fn get_checked_topmost_owner(
228		collection: CollectionId,243		collection: CollectionId,
229		token: TokenId,244		token: TokenId,
230		for_nest: Option<(CollectionId, TokenId)>,245		for_nest: Option<(CollectionId, TokenId)>,
231		budget: &dyn Budget,246		budget: &dyn Budget,
232	) -> Result<T::CrossAccountId, DispatchError> {247	) -> Result<Option<T::CrossAccountId>, DispatchError> {
233		// Tried to nest token in itself248		// Tried to nest token in itself
234		if Some((collection, token)) == for_nest {249		if Some((collection, token)) == for_nest {
235			return Err(<Error<T>>::OuroborosDetected.into());250			return Err(<Error<T>>::OuroborosDetected.into());
242					return Err(<Error<T>>::OuroborosDetected.into())257					return Err(<Error<T>>::OuroborosDetected.into())
243				}258				}
244				// Token is owned by other user259				// Token is owned by other user
245				Parent::User(user) => return Ok(user),260				Parent::User(user) => return Ok(Some(user)),
246				Parent::TokenNotFound => return Err(<Error<T>>::TokenNotFound.into()),261				Parent::TokenNotFound => return Err(<Error<T>>::TokenNotFound.into()),
262				Parent::MultipleOwners => return Ok(None),
247				// Continue parent chain263				// Continue parent chain
248				Parent::Token(_, _) => {}264				Parent::Token(_, _) => {}
249			}265			}
284		budget: &dyn Budget,300		budget: &dyn Budget,
285	) -> Result<bool, DispatchError> {301	) -> Result<bool, DispatchError> {
286		let target_parent = match T::CrossTokenAddressMapping::address_to_token(&user) {302		let target_parent = match T::CrossTokenAddressMapping::address_to_token(&user) {
287			Some((collection, token)) => Self::find_topmost_owner(collection, token, budget)?,303			Some((collection, token)) => match Self::find_topmost_owner(collection, token, budget)?
304			{
305				Some(topmost_owner) => topmost_owner,
306				None => return Ok(false),
307			},
288			None => user,308			None => user,
289		};309		};
290310
291		Self::get_checked_topmost_owner(collection, token, for_nest, budget)311		Self::get_checked_topmost_owner(collection, token, for_nest, budget).map(|indirect_owner| {
292			.map(|indirect_owner| indirect_owner == target_parent)312			indirect_owner.map_or(false, |indirect_owner| indirect_owner == target_parent)
313		})
293	}314	}
294315
295	/// Checks that `under` is valid token and that `token_id` could be nested under it316	/// Checks that `under` is valid token and that `token_id` could be nested under it

--- a/primitives/data-structs/src/lib.rs
+++ b/primitives/data-structs/src/lib.rs
@@ -1099,6 +1099,13 @@
 	EmptyPropertyKey,
 }
 
+/// Token owner error: it could be either `NotFound` ot `MultipleOwners`.
+#[derive(Debug)]
+pub enum TokenOwnerError {
+	NotFound,
+	MultipleOwners,
+}
+
 /// Marker for scope of property.
 ///
 /// Scoped property can't be changed by user. Used for external collections.

--- a/runtime/common/runtime_apis.rs
+++ b/runtime/common/runtime_apis.rs
@@ -16,11 +16,11 @@
 
 #[macro_export]
 macro_rules! dispatch_unique_runtime {
-	($collection:ident.$method:ident($($name:ident),*)) => {{
+	($collection:ident.$method:ident($($name:ident),*) $($rest:tt)*) => {{
 		let collection = <Runtime as pallet_common::Config>::CollectionDispatch::dispatch(<pallet_common::CollectionHandle<Runtime>>::try_get($collection)?);
 		let dispatch = collection.as_dyn();
 
-		Ok::<_, DispatchError>(dispatch.$method($($name),*))
+		Ok::<_, DispatchError>(dispatch.$method($($name),*) $($rest)*)
 	}};
 }
 
@@ -73,7 +73,7 @@
                 }
 
                 fn token_owner(collection: CollectionId, token: TokenId) -> Result<Option<CrossAccountId>, DispatchError> {
-                    dispatch_unique_runtime!(collection.token_owner(token))
+                    dispatch_unique_runtime!(collection.token_owner(token).ok())
                 }
 
                 fn token_owners(collection: CollectionId, token: TokenId) -> Result<Vec::<CrossAccountId>, DispatchError>  {
@@ -83,7 +83,7 @@
                 fn topmost_token_owner(collection: CollectionId, token: TokenId) -> Result<Option<CrossAccountId>, DispatchError> {
                     let budget = up_data_structs::budget::Value::new(10);
 
-                    Ok(Some(<pallet_structure::Pallet<Runtime>>::find_topmost_owner(collection, token, &budget)?))
+                    Ok(<pallet_structure::Pallet<Runtime>>::find_topmost_owner(collection, token, &budget)?)
                 }
                 fn token_children(collection: CollectionId, token: TokenId) -> Result<Vec<TokenChild>, DispatchError> {
                     Ok(<pallet_nonfungible::Pallet<Runtime>>::token_children_ids(collection, token))

--- a/tests/src/nesting/nest.test.ts
+++ b/tests/src/nesting/nest.test.ts
@@ -15,7 +15,7 @@
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
 import {IKeyringPair} from '@polkadot/types/types';
-import {expect, itSub, usingPlaygrounds} from '../util';
+import {expect, itSub, Pallets, usingPlaygrounds} from '../util';
 
 describe('Integration Test: Composite nesting tests', () => {
   let alice: IKeyringPair;
@@ -138,7 +138,7 @@
   before(async () => {
     await usingPlaygrounds(async (helper, privateKey) => {
       const donor = await privateKey({filename: __filename});
-      [alice, bob, charlie] = await helper.arrange.createAccounts([50n, 10n, 10n], donor);
+      [alice, bob, charlie] = await helper.arrange.createAccounts([200n, 10n, 10n], donor);
     });
   });
 
@@ -288,6 +288,38 @@
     await collectionFT.transfer(charlie, targetToken.nestingAccount(), 2n);
     expect(await collectionFT.getBalance(targetToken.nestingAccount())).to.be.equal(7n);
   });
+
+  itSub.ifWithPallets('ReFungible: getTopmostOwner works correctly with Nesting', [Pallets.ReFungible], async({helper}) => {
+    const collectionNFT = await helper.nft.mintCollection(alice, {
+      permissions: {
+        nesting: {
+          tokenOwner: true,
+        },
+      },
+    });
+    const collectionRFT = await helper.rft.mintCollection(alice);
+
+    const nft = await collectionNFT.mintToken(alice, {Substrate: alice.address});
+    const rft = await collectionRFT.mintToken(alice, 100n, {Substrate: alice.address});
+
+    expect(await rft.getTopmostOwner()).deep.equal({Substrate: alice.address});
+
+    await rft.transfer(alice, nft.nestingAccount(), 40n);
+
+    expect(await rft.getTopmostOwner()).deep.equal(null);
+
+    await rft.transfer(alice, nft.nestingAccount(), 60n);
+
+    expect(await rft.getTopmostOwner()).deep.equal({Substrate: alice.address});
+
+    await rft.transferFrom(alice, nft.nestingAccount(), {Substrate: alice.address}, 30n);
+
+    expect(await rft.getTopmostOwner()).deep.equal(null);
+
+    await rft.transferFrom(alice, nft.nestingAccount(), {Substrate: alice.address}, 70n);
+
+    expect(await rft.getTopmostOwner()).deep.equal({Substrate: alice.address});
+  });
 });
 
 describe('Negative Test: Nesting', () => {