git.delta.rocks / unique-network / refs/commits / f58e687dd6e0

difftreelog

NFTPAR-142 Off-chain and on-chain data schema.

sotmorskiy2020-11-11parent: #3f1f974.patch.diff
in: master

6 files changed

modifiednode/src/chain_spec.rsdiffbeforeafterboth
--- a/node/src/chain_spec.rs
+++ b/node/src/chain_spec.rs
@@ -159,17 +159,18 @@
                 1,
                 CollectionType {
                     owner: get_account_id_from_seed::<sr25519::Public>("Alice"),
-                    mode: CollectionMode::NFT(50),
+                    mode: CollectionMode::NFT,
                     access: AccessMode::Normal,
                     decimal_points: 0,
                     name: vec![],
                     description: vec![],
                     token_prefix: vec![],
-                    custom_data_size: 50,
                     mint_mode: false,
                     offchain_schema: vec![],
                     sponsor: get_account_id_from_seed::<sr25519::Public>("Alice"),
                     unconfirmed_sponsor: get_account_id_from_seed::<sr25519::Public>("Alice"),
+                    const_on_chain_schema: vec![],
+                    variable_on_chain_schema: vec![]
                 },
             )],
             nft_item_id: vec![],
modifiedpallets/nft/src/benchmarking.rsdiffbeforeafterboth
--- a/pallets/nft/src/benchmarking.rs
+++ b/pallets/nft/src/benchmarking.rs
@@ -9,6 +9,19 @@
 
     const SEED: u32 = 1;
 
+    fn default_nft_data() -> CreateItemData {
+        CreateItemData::NFT(CreateNftData { const_data: vec![1, 2, 3], variable_data: vec![3, 2, 1] })
+    }
+    
+    fn default_fungible_data () -> CreateItemData {
+        CreateItemData::Fungible(CreateFungibleData { })
+    }
+    
+    fn default_re_fungible_data () -> CreateItemData {
+        CreateItemData::ReFungible(CreateReFungibleData { const_data: vec![1, 2, 3], variable_data: vec![3, 2, 1] })
+    }
+
+
     benchmarks! {
 
         _ {}
@@ -17,7 +30,7 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::NFT(2000);
+            let mode: CollectionMode = CollectionMode::NFT;
             let caller: T::AccountId = account("caller", 0, SEED);
         }: create_collection(RawOrigin::Signed(caller.clone()), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode)
         verify {
@@ -28,7 +41,7 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::NFT(2000);
+            let mode: CollectionMode = CollectionMode::NFT;
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
         }: destroy_collection(RawOrigin::Signed(caller.clone()), 2)
@@ -37,7 +50,7 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::NFT(2000);
+            let mode: CollectionMode = CollectionMode::NFT;
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             let whitelist_account: T::AccountId = account("admin", 0, SEED);
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
@@ -47,7 +60,7 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::NFT(2000);
+            let mode: CollectionMode = CollectionMode::NFT;
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             let whitelist_account: T::AccountId = account("admin", 0, SEED);
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
@@ -58,7 +71,7 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::NFT(2000);
+            let mode: CollectionMode = CollectionMode::NFT;
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
         }: set_public_access_mode(RawOrigin::Signed(caller.clone()), 2, AccessMode::WhiteList)
@@ -67,7 +80,7 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::NFT(2000);
+            let mode: CollectionMode = CollectionMode::NFT;
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
         }: set_mint_permission(RawOrigin::Signed(caller.clone()), 2, true)
@@ -76,7 +89,7 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::NFT(2000);
+            let mode: CollectionMode = CollectionMode::NFT;
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
             let new_owner: T::AccountId = account("admin", 0, SEED);
@@ -86,7 +99,7 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::NFT(2000);
+            let mode: CollectionMode = CollectionMode::NFT;
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
             let new_admin: T::AccountId = account("admin", 0, SEED);
@@ -96,7 +109,7 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::NFT(2000);
+            let mode: CollectionMode = CollectionMode::NFT;
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
             let new_admin: T::AccountId = account("admin", 0, SEED);
@@ -107,7 +120,7 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::NFT(2000);
+            let mode: CollectionMode = CollectionMode::NFT;
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
         }: set_collection_sponsor(RawOrigin::Signed(caller.clone()), 2, caller.clone())
@@ -116,7 +129,7 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::NFT(2000);
+            let mode: CollectionMode = CollectionMode::NFT;
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
             Nft::<T>::set_collection_sponsor(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone())?;
@@ -126,7 +139,7 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::NFT(2000);
+            let mode: CollectionMode = CollectionMode::NFT;
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
             Nft::<T>::set_collection_sponsor(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone())?;
@@ -138,26 +151,32 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::NFT(2000);
+            let mode: CollectionMode = CollectionMode::NFT;
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-
-        }: create_item(RawOrigin::Signed(caller.clone()), 2, [1,2,3].to_vec(), caller.clone())
+            let data = default_nft_data();
+            
+        }: create_item(RawOrigin::Signed(caller.clone()), 2, caller.clone(), data)
 
         #[extra]
         create_item_nft_large {
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::NFT(2000);
+            let mode: CollectionMode = CollectionMode::NFT;
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-            let mut item_large: Vec<u8> = Vec::new(); 
+            let nft_data = CreateNftData {
+                const_data: vec![],
+                variable_data: vec![]
+            };
             for i in 0..1998 {
-                item_large.push(10);
+                nft_data.const_data.push(10);
+                nft_data.variable_data.push(10);
             }
+            let mut data = CreateItemData::NFT(nft_data);
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
 
-        }: create_item(RawOrigin::Signed(caller.clone()), 2, item_large, caller.clone())
+        }: create_item(RawOrigin::Signed(caller.clone()), 2, caller.clone(), data)
 
         // fungible item
         create_item_fungible {
@@ -167,28 +186,31 @@
             let mode: CollectionMode = CollectionMode::Fungible(3);
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
+            let data = default_fungible_data();
 
-        }: create_item(RawOrigin::Signed(caller.clone()), 2, [].to_vec(), caller.clone())
+        }: create_item(RawOrigin::Signed(caller.clone()), 2, caller.clone(), data)
 
         // refungible item
         create_item_refungible {
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::ReFungible(3, 3);
+            let mode: CollectionMode = CollectionMode::ReFungible(3);
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
+            let data = default_re_fungible_data();
 
-        }: create_item(RawOrigin::Signed(caller.clone()), 2, [1,2,3].to_vec(), caller.clone())
+        }: create_item(RawOrigin::Signed(caller.clone()), 2, caller.clone(), data)
 
         burn_item {
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::NFT(2000);
+            let mode: CollectionMode = CollectionMode::NFT;
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-            Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, [1, 2, 3].to_vec(), caller.clone())?;
+            let data = default_nft_data();
+            Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone(), data)?;
 
         }: burn_item(RawOrigin::Signed(caller.clone()), 2, 1)
 
@@ -196,11 +218,12 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::NFT(2000);
+            let mode: CollectionMode = CollectionMode::NFT;
             let recipient: T::AccountId = account("recipient", 0, SEED);
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-            Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, [1, 2, 3].to_vec(), caller.clone())?;
+            let data = default_nft_data();
+            Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone(), data)?;
 
         }: transfer(RawOrigin::Signed(caller.clone()), recipient.clone(), 2, 1, 1)
         
@@ -212,7 +235,8 @@
             let recipient: T::AccountId = account("recipient", 0, SEED);
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-            Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, [].to_vec(), caller.clone())?;
+            let data = default_fungible_data();
+            Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone(), data)?;
 
         }: transfer(RawOrigin::Signed(caller.clone()), recipient.clone(), 2, 1, 1)
 
@@ -220,11 +244,12 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::ReFungible(3,3);
+            let mode: CollectionMode = CollectionMode::ReFungible(3);
             let recipient: T::AccountId = account("recipient", 0, SEED);
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-            Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, [1,2,3].to_vec(), caller.clone())?;
+            let data = default_re_fungible_data();
+            Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone(), data)?;
 
         }: transfer(RawOrigin::Signed(caller.clone()), recipient.clone(), 2, 1, 1)
 
@@ -232,11 +257,12 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::ReFungible(3,3);
+            let mode: CollectionMode = CollectionMode::ReFungible(3);
             let recipient: T::AccountId = account("recipient", 0, SEED);
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-            Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, [1,2,3].to_vec(), caller.clone())?;
+            let data = default_re_fungible_data();
+            Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone(), data)?;
 
         }: approve(RawOrigin::Signed(caller.clone()), recipient.clone(), 2, 1)
 
@@ -245,11 +271,12 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::NFT(300);
+            let mode: CollectionMode = CollectionMode::NFT;
             let recipient: T::AccountId = account("recipient", 0, SEED);
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-            Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, [1,2,3].to_vec(), caller.clone())?;
+            let data = default_nft_data();
+            Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone(), data)?;
             Nft::<T>::approve(RawOrigin::Signed(caller.clone()).into(), recipient.clone(), 2, 1)?;
 
         }: transfer_from(RawOrigin::Signed(caller.clone()), caller.clone(), recipient.clone(), 2, 1, 1)
@@ -263,7 +290,8 @@
             let recipient: T::AccountId = account("recipient", 0, SEED);
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-            Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, [].to_vec(), caller.clone())?;
+            let data = default_fungible_data();
+            Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone(), data)?;
             Nft::<T>::approve(RawOrigin::Signed(caller.clone()).into(), recipient.clone(), 2, 1)?;
 
         }: transfer_from(RawOrigin::Signed(caller.clone()), caller.clone(), recipient.clone(), 2, 1, 1)
@@ -273,11 +301,12 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::ReFungible(3,3);
+            let mode: CollectionMode = CollectionMode::ReFungible(3);
             let recipient: T::AccountId = account("recipient", 0, SEED);
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-            Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, [1,2,3].to_vec(), caller.clone())?;
+            let data = default_re_fungible_data();
+            Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone(), data)?;
             Nft::<T>::approve(RawOrigin::Signed(caller.clone()).into(), recipient.clone(), 2, 1)?;
 
         }: transfer_from(RawOrigin::Signed(caller.clone()), caller.clone(), recipient.clone(), 2, 1, 1)
@@ -286,9 +315,39 @@
             let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
             let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
             let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-            let mode: CollectionMode = CollectionMode::ReFungible(3,3);
+            let mode: CollectionMode = CollectionMode::ReFungible(3);
             let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
             Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
 
         }: set_offchain_schema(RawOrigin::Signed(caller.clone()), 2, [1,2,3].to_vec())
-    }
\ No newline at end of file
+
+        set_const_on_chain_schema {
+            let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
+            let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
+            let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
+            let mode: CollectionMode = CollectionMode::ReFungible(3);
+            let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
+            Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
+        }: set_const_on_chain_schema(RawOrigin::Signed(caller.clone()), 2, [1,2,3].to_vec())
+        
+        set_variable_on_chain_schema {
+            let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
+            let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
+            let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
+            let mode: CollectionMode = CollectionMode::ReFungible(3);
+            let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
+            Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
+        }: set_variable_on_chain_schema(RawOrigin::Signed(caller.clone()), 2, [1,2,3].to_vec())
+
+        set_variable_meta_data {
+            let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
+            let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
+            let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
+            let mode: CollectionMode = CollectionMode::NFT;
+            let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
+            Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
+            let data = default_nft_data();
+            Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone(), data)?;
+
+        }: set_variable_meta_data(RawOrigin::Signed(caller.clone()), 2, 1, [1, 2, 3].to_vec())
+}
\ No newline at end of file
modifiedpallets/nft/src/default_weights.rsdiffbeforeafterboth
--- a/pallets/nft/src/default_weights.rs
+++ b/pallets/nft/src/default_weights.rs
@@ -92,4 +92,19 @@
             .saturating_add(DbWeight::get().reads(2 as Weight))
             .saturating_add(DbWeight::get().writes(1 as Weight))
     }
+    fn set_const_on_chain_schema() -> Weight {
+        (11_100_000 as Weight)
+            .saturating_add(DbWeight::get().reads(2 as Weight))
+            .saturating_add(DbWeight::get().writes(1 as Weight))
+    }
+    fn set_variable_on_chain_schema() -> Weight {
+        (11_100_000 as Weight)
+            .saturating_add(DbWeight::get().reads(2 as Weight))
+            .saturating_add(DbWeight::get().writes(1 as Weight))
+    }
+    fn set_variable_meta_data() -> Weight {
+        (17_500_000 as Weight)
+            .saturating_add(DbWeight::get().reads(2 as Weight))
+            .saturating_add(DbWeight::get().writes(1 as Weight))
+    }
 }
modifiedpallets/nft/src/lib.rsdiffbeforeafterboth
--- a/pallets/nft/src/lib.rs
+++ b/pallets/nft/src/lib.rs
@@ -10,7 +10,7 @@
 pub use frame_support::{
     construct_runtime, decl_event, decl_module, decl_storage,
     dispatch::DispatchResult,
-    ensure, parameter_types,
+    ensure, parameter_types, fail,
     traits::{
         Currency, ExistenceRequirement, Get, Imbalance, KeyOwnerProofSystem, OnUnbalanced,
         Randomness, WithdrawReason,
@@ -53,21 +53,20 @@
 #[cfg_attr(feature = "std", derive(Serialize, Deserialize))]
 pub enum CollectionMode {
     Invalid,
-    // custom data size
-    NFT(u32),
+    NFT,
     // decimal points
     Fungible(u32),
-    // custom data size and decimal points
-    ReFungible(u32, u32),
+    // decimal points
+    ReFungible(u32),
 }
 
 impl Into<u8> for CollectionMode {
     fn into(self) -> u8 {
         match self {
             CollectionMode::Invalid => 0,
-            CollectionMode::NFT(_) => 1,
+            CollectionMode::NFT => 1,
             CollectionMode::Fungible(_) => 2,
-            CollectionMode::ReFungible(_, _) => 3,
+            CollectionMode::ReFungible(_) => 3,
         }
     }
 }
@@ -107,11 +106,12 @@
     pub name: Vec<u16>,        // 64 include null escape char
     pub description: Vec<u16>, // 256 include null escape char
     pub token_prefix: Vec<u8>, // 16 include null escape char
-    pub custom_data_size: u32,
     pub mint_mode: bool,
     pub offchain_schema: Vec<u8>,
     pub sponsor: AccountId, // Who pays fees. If set to default address, the fees are applied to the transaction sender
     pub unconfirmed_sponsor: AccountId, // Sponsor address that has not yet confirmed sponsorship
+    pub variable_on_chain_schema: Vec<u8>, //
+    pub const_on_chain_schema: Vec<u8>, //
 }
 
 #[derive(Encode, Decode, Default, Debug, Clone, PartialEq)]
@@ -126,7 +126,8 @@
 pub struct NftItemType<AccountId> {
     pub collection: u64,
     pub owner: AccountId,
-    pub data: Vec<u8>,
+    pub const_data: Vec<u8>,
+    pub variable_data: Vec<u8>,
 }
 
 #[derive(Encode, Decode, Default, Debug, Clone, PartialEq)]
@@ -142,7 +143,8 @@
 pub struct ReFungibleItemType<AccountId> {
     pub collection: u64,
     pub owner: Vec<Ownership<AccountId>>,
-    pub data: Vec<u8>,
+    pub const_data: Vec<u8>,
+    pub variable_data: Vec<u8>,
 }
 
 #[derive(Encode, Decode, Default, Debug, Clone, PartialEq)]
@@ -197,14 +199,56 @@
     fn set_collection_sponsor() -> Weight;
     fn confirm_sponsorship() -> Weight;
     fn remove_collection_sponsor() -> Weight;
-    fn create_item(s: usize, ) -> Weight;
+    fn create_item(s: usize) -> Weight;
     fn burn_item() -> Weight;
     fn transfer() -> Weight;
     fn approve() -> Weight;
     fn transfer_from() -> Weight;
     fn set_offchain_schema() -> Weight;
+    fn set_const_on_chain_schema() -> Weight;
+    fn set_variable_on_chain_schema() -> Weight;
+    fn set_variable_meta_data() -> Weight;
+}
+
+#[derive(Encode, Decode, Default, Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]
+pub struct CreateNftData {
+    pub const_data: Vec<u8>,
+    pub variable_data: Vec<u8>,
 }
 
+#[derive(Encode, Decode, Default, Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]
+pub struct CreateFungibleData {
+}
+
+#[derive(Encode, Decode, Default, Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]
+pub struct CreateReFungibleData {
+    pub const_data: Vec<u8>,
+    pub variable_data: Vec<u8>,
+}
+
+#[derive(Encode, Decode, Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "std", derive(Serialize, Deserialize))]
+pub enum CreateItemData {
+    NFT(CreateNftData),
+    Fungible(CreateFungibleData),
+    ReFungible(CreateReFungibleData)
+}
+
+impl CreateItemData {
+    pub fn len(&self) -> usize {
+        let len = match self {
+            CreateItemData::NFT(data) => data.variable_data.len() + data.const_data.len(),
+            CreateItemData::ReFungible(data) => data.variable_data.len() + data.const_data.len(),
+            _ => 0
+        };
+        
+        return len;
+    }
+}
+
 pub trait Trait: system::Trait + Sized  {
     type Event: From<Event<Self>> + Into<<Self as system::Trait>::Event>;
 
@@ -361,25 +405,10 @@
 
             // Anyone can create a collection
             let who = ensure_signed(origin)?;
-            let custom_data_size = match mode {
-                CollectionMode::NFT(size) => {
-
-                    // bound Custom data size
-                    ensure!(size < ChainLimit::get().custom_data_limit, "Custom data size bound exceeded");
-                    size
-                },
-                CollectionMode::ReFungible(size, _) => {
-
-                    // bound Custom data size
-                    ensure!(size < ChainLimit::get().custom_data_limit, "Custom data size bound exceeded");
-                    size
-                },
-                _ => 0
-            };
 
             let decimal_points = match mode {
                 CollectionMode::Fungible(points) => points,
-                CollectionMode::ReFungible(_, points) => points,
+                CollectionMode::ReFungible(points) => points,
                 _ => 0
             };
 
@@ -425,9 +454,10 @@
                 decimal_points: decimal_points,
                 token_prefix: prefix,
                 offchain_schema: Vec::new(),
-                custom_data_size: custom_data_size,
                 sponsor: T::AccountId::default(),
                 unconfirmed_sponsor: T::AccountId::default(),
+                variable_on_chain_schema: Vec::new(),
+                const_on_chain_schema: Vec::new(),
             };
 
             // Add new collection to map
@@ -440,7 +470,7 @@
         }
 
         /// **DANGEROUS**: Destroys collection and all NFTs within this collection. Users irrecoverably lose their assets and may lose real money.
-        /// 
+        ///     
         /// # Permissions
         /// 
         /// * Collection Owner.
@@ -769,78 +799,89 @@
         /// # Arguments
         /// 
         /// * collection_id: ID of the collection.
-        /// 
-        /// * properties: Array of bytes that contains NFT properties. Since NFT Module is agnostic of properties meaning, it is treated purely as an array of bytes.
         /// 
         /// * owner: Address, initial owner of the NFT.
+        ///
+        /// * data: Token data to store on chain.
         // #[weight =
         // (130_000_000 as Weight)
         // .saturating_add((2135 as Weight).saturating_mul((properties.len() as u64) as Weight))
         // .saturating_add(RocksDbWeight::get().reads(10 as Weight))
         // .saturating_add(RocksDbWeight::get().writes(8 as Weight))]
 
-        #[weight = T::WeightInfo::create_item(properties.len())]
-        pub fn create_item(origin, collection_id: u64, properties: Vec<u8>, owner: T::AccountId) -> DispatchResult {
+        #[weight = T::WeightInfo::create_item(data.len())]
+        pub fn create_item(origin, collection_id: u64, owner: T::AccountId, data: CreateItemData) -> DispatchResult {
 
             let sender = ensure_signed(origin)?;
             Self::collection_exists(collection_id)?;
             let target_collection = <Collection<T>>::get(collection_id);
 
             if !Self::is_owner_or_admin_permissions(collection_id, sender.clone()) {
-                ensure!(target_collection.mint_mode == true, "Public minting is not allowed for this collection");
+                ensure!(target_collection.mint_mode == true, "Public minting is not allowed for this collection.");
                 Self::check_white_list(collection_id, &owner)?;
                 Self::check_white_list(collection_id, &sender)?;
             }
 
             match target_collection.mode
             {
-                CollectionMode::NFT(_) => {
-
-                    // check size
-                    ensure!(target_collection.custom_data_size >= properties.len() as u32, "Size of item is too large");
-
-                    // Create nft item
-                    let item = NftItemType {
-                        collection: collection_id,
-                        owner: owner,
-                        data: properties.clone(),
-                    };
-
-                    Self::add_nft_item(item)?;
-
+                CollectionMode::NFT => {
+                    if let CreateItemData::NFT(data) = data {
+                        // check sizes
+                        ensure!(ChainLimit::get().custom_data_limit >= data.const_data.len() as u32, "const_data exceeded data limit.");
+                        ensure!(ChainLimit::get().custom_data_limit >= data.variable_data.len() as u32, "variable_data exceeded data limit.");
+    
+                        // Create nft item
+                        let item = NftItemType {
+                            collection: collection_id,
+                            owner: owner,
+                            const_data: data.const_data.clone(),
+                            variable_data: data.variable_data.clone() 
+                        };
+    
+                        Self::add_nft_item(item)?;
+                    
+                    } else {
+                        fail!("Not NFT item data used to mint in NFT collection.");
+                    }
                 },
                 CollectionMode::Fungible(_) => {
-
-                    // check size
-                    ensure!(properties.len() as u32 == 0, "Size of item must be 0 with fungible type");
-
-                    let item = FungibleItemType {
-                        collection: collection_id,
-                        owner: owner,
-                        value: (10 as u128).pow(target_collection.decimal_points)
-                    };
-
-                    Self::add_fungible_item(item)?;
+                    if let CreateItemData::Fungible(_) = data {
+    
+                        let item = FungibleItemType {
+                            collection: collection_id,
+                            owner: owner,
+                            value: (10 as u128).pow(target_collection.decimal_points)
+                        };
+    
+                        Self::add_fungible_item(item)?;
+                    } else {
+                        fail!("Not Fungible item data used to mint in Fungible collection.");
+                    }
                 },
-                CollectionMode::ReFungible(_, _) => {
-
-                    // check size
-                    ensure!(target_collection.custom_data_size >= properties.len() as u32, "Size of item is too large");
-
-                    let mut owner_list = Vec::new();
-                    let value = (10 as u128).pow(target_collection.decimal_points);
-                    owner_list.push(Ownership {owner: owner.clone(), fraction: value});
-
-                    let item = ReFungibleItemType {
-                        collection: collection_id,
-                        owner: owner_list,
-                        data: properties.clone()
-                    };
-
-                    Self::add_refungible_item(item)?;
+                CollectionMode::ReFungible(_) => {
+                    if let CreateItemData::ReFungible(data) = data {
+    
+                        // check sizes
+                        ensure!(ChainLimit::get().custom_data_limit >= data.const_data.len() as u32, "const_data exceeded data limit.");
+                        ensure!(ChainLimit::get().custom_data_limit >= data.variable_data.len() as u32, "variable_data exceeded data limit.");
+    
+                        let mut owner_list = Vec::new();
+                        let value = (10 as u128).pow(target_collection.decimal_points);
+                        owner_list.push(Ownership {owner: owner.clone(), fraction: value});
+    
+                        let item = ReFungibleItemType {
+                            collection: collection_id,
+                            owner: owner_list,
+                            const_data: data.const_data.clone(),
+                            variable_data: data.variable_data.clone() 
+                        };
+    
+                        Self::add_refungible_item(item)?;
+                    } else {
+                        fail!("Not Re Fungible item data used to mint in Re Fungible collection.");
+                    }
                 },
-                _ => { ensure!(1 == 0,"just error"); }
-
+                _ => { ensure!(1 == 0,"Unexpected collection type."); }
             };
 
             // call event
@@ -880,9 +921,9 @@
 
             match target_collection.mode
             {
-                CollectionMode::NFT(_) => Self::burn_nft_item(collection_id, item_id)?,
+                CollectionMode::NFT => Self::burn_nft_item(collection_id, item_id)?,
                 CollectionMode::Fungible(_)  => Self::burn_fungible_item(collection_id, item_id)?,
-                CollectionMode::ReFungible(_, _)  => Self::burn_refungible_item(collection_id, item_id, sender.clone())?,
+                CollectionMode::ReFungible(_)  => Self::burn_refungible_item(collection_id, item_id, sender.clone())?,
                 _ => ()
             };
 
@@ -933,9 +974,9 @@
 
             match target_collection.mode
             {
-                CollectionMode::NFT(_) => Self::transfer_nft(collection_id, item_id, sender.clone(), recipient)?,
+                CollectionMode::NFT => Self::transfer_nft(collection_id, item_id, sender.clone(), recipient)?,
                 CollectionMode::Fungible(_)  => Self::transfer_fungible(collection_id, item_id, value, sender.clone(), recipient)?,
-                CollectionMode::ReFungible(_, _)  => Self::transfer_refungible(collection_id, item_id, value, sender.clone(), recipient)?,
+                CollectionMode::ReFungible(_)  => Self::transfer_refungible(collection_id, item_id, value, sender.clone(), recipient)?,
                 _ => ()
             };
 
@@ -1050,9 +1091,9 @@
 
             match target_collection.mode
             {
-                CollectionMode::NFT(_) => Self::transfer_nft(collection_id, item_id, from, recipient)?,
+                CollectionMode::NFT => Self::transfer_nft(collection_id, item_id, from, recipient)?,
                 CollectionMode::Fungible(_)  => Self::transfer_fungible(collection_id, item_id, value, from.clone(), recipient)?,
-                CollectionMode::ReFungible(_, _)  => Self::transfer_refungible(collection_id, item_id, value, from.clone(), recipient)?,
+                CollectionMode::ReFungible(_)  => Self::transfer_refungible(collection_id, item_id, value, from.clone(), recipient)?,
                 _ => ()
             };
 
@@ -1074,7 +1115,49 @@
 
             Ok(())
         }
+        
+        /// Set off-chain data schema.
+        /// 
+        /// # Permissions
+        /// 
+        /// * Collection Owner
+        /// * Collection Admin
+        /// 
+        /// # Arguments
+        /// 
+        /// * collection_id.
+        /// 
+        /// * schema: String representing the offchain data schema.
+        #[weight = T::WeightInfo::set_variable_meta_data()]
+        pub fn set_variable_meta_data (
+            origin,
+            collection_id: u64,
+            item_id: u64,
+            data: Vec<u8>
+        ) -> DispatchResult {
+            let sender = ensure_signed(origin)?;
+            
+            Self::collection_exists(collection_id)?;
+
+            // Modify permissions check
+            let target_collection = <Collection<T>>::get(collection_id);
+            ensure!(Self::is_item_owner(sender.clone(), collection_id, item_id) ||
+                Self::is_owner_or_admin_permissions(collection_id, sender.clone()),
+                "Only item owner, collection owner and admins can modify item");
+
+            Self::item_exists(collection_id, item_id, &target_collection.mode)?;
+
+            match target_collection.mode
+            {
+                CollectionMode::NFT => Self::set_nft_variable_data(collection_id, item_id, data)?,
+                CollectionMode::ReFungible(_)  => Self::set_re_fungible_variable_data(collection_id, item_id, data)?,
+                _ => ()
+            };
 
+            Ok(())
+        }
+        
+
         /// Set off-chain data schema.
         /// 
         /// # Permissions
@@ -1103,6 +1186,62 @@
             Ok(())
         }
 
+        /// Set const on-chain data schema.
+        /// 
+        /// # Permissions
+        /// 
+        /// * Collection Owner
+        /// * Collection Admin
+        /// 
+        /// # Arguments
+        /// 
+        /// * collection_id.
+        /// 
+        /// * schema: String representing the const on-chain data schema.
+        #[weight = T::WeightInfo::set_const_on_chain_schema()]
+        pub fn set_const_on_chain_schema (
+            origin,
+            collection_id: u64,
+            schema: Vec<u8>
+        ) -> DispatchResult {
+            let sender = ensure_signed(origin)?;
+            Self::check_owner_or_admin_permissions(collection_id, sender.clone())?;
+
+            let mut target_collection = <Collection<T>>::get(collection_id);
+            target_collection.const_on_chain_schema = schema;
+            <Collection<T>>::insert(collection_id, target_collection);
+
+            Ok(())
+        }
+
+        /// Set variable on-chain data schema.
+        /// 
+        /// # Permissions
+        /// 
+        /// * Collection Owner
+        /// * Collection Admin
+        /// 
+        /// # Arguments
+        /// 
+        /// * collection_id.
+        /// 
+        /// * schema: String representing the variable on-chain data schema.
+        #[weight = T::WeightInfo::set_const_on_chain_schema()]
+        pub fn set_variable_on_chain_schema (
+            origin,
+            collection_id: u64,
+            schema: Vec<u8>
+        ) -> DispatchResult {
+            let sender = ensure_signed(origin)?;
+            Self::check_owner_or_admin_permissions(collection_id, sender.clone())?;
+
+            let mut target_collection = <Collection<T>>::get(collection_id);
+            target_collection.variable_on_chain_schema = schema;
+            <Collection<T>>::insert(collection_id, target_collection);
+
+            Ok(())
+        }
+
         // Sudo permissions function
         #[weight = 0]
         pub fn set_chain_limits(
@@ -1322,13 +1461,13 @@
         let target_collection = <Collection<T>>::get(collection_id);
 
         match target_collection.mode {
-            CollectionMode::NFT(_) => {
+            CollectionMode::NFT => {
                 <NftItemList<T>>::get(collection_id, item_id).owner == subject
             }
             CollectionMode::Fungible(_) => {
                 <FungibleItemList<T>>::get(collection_id, item_id).owner == subject
             }
-            CollectionMode::ReFungible(_, _) => {
+            CollectionMode::ReFungible(_) => {
                 <ReFungibleItemList<T>>::get(collection_id, item_id)
                     .owner
                     .iter()
@@ -1563,7 +1702,50 @@
         <ApprovedList<T>>::remove(collection_id, (item_id, old_owner));
         Ok(())
     }
+    
+    fn item_exists(
+        collection_id: u64,
+        item_id: u64,
+        mode: &CollectionMode
+    ) -> DispatchResult {
+        match mode {
+            CollectionMode::NFT => ensure!(<NftItemList<T>>::contains_key(collection_id, item_id), "Item does not exists"),
+            CollectionMode::ReFungible(_) => ensure!(<ReFungibleItemList<T>>::contains_key(collection_id, item_id), "Item does not exists"),
+            CollectionMode::Fungible(_) => ensure!(<FungibleItemList<T>>::contains_key(collection_id, item_id), "Item does not exists"),
+            _ => ()
+        };
+        
+        Ok(())
+    }
+
+    fn set_re_fungible_variable_data(
+        collection_id: u64,
+        item_id: u64,
+        data: Vec<u8>
+    ) -> DispatchResult {
+        let mut item = <ReFungibleItemList<T>>::get(collection_id, item_id);
+
+        item.variable_data = data;
+
+        <ReFungibleItemList<T>>::insert(collection_id, item_id, item);
+
+        Ok(())
+    }
+
+    fn set_nft_variable_data(
+        collection_id: u64,
+        item_id: u64,
+        data: Vec<u8>
+    ) -> DispatchResult {
+        let mut item = <NftItemList<T>>::get(collection_id, item_id);
+        
+        item.variable_data = data;
 
+        <NftItemList<T>>::insert(collection_id, item_id, item);
+        
+        Ok(())
+    }
+
     fn init_collection(item: &CollectionType<T::AccountId>) {
         // check params
         assert!(
@@ -1804,7 +1986,7 @@
 
                 // sponsor timeout
                 let sponsor_transfer = match _collection_mode {
-                    CollectionMode::NFT(_) => {
+                    CollectionMode::NFT => {
                         let basket = <NftTransferBasket<T>>::get(collection_id, _item_id);
                         let block_number = <system::Module<T>>::block_number() as T::BlockNumber;
                         let limit_time = basket + ChainLimit::get().nft_sponsor_transfer_timeout.into();
@@ -1838,7 +2020,7 @@
                             true
                         }
                     }
-                    CollectionMode::ReFungible(_, _) => {
+                    CollectionMode::ReFungible(_) => {
                         let basket = <ReFungibleTransferBasket<T>>::get(collection_id, _item_id);
                         let block_number = <system::Module<T>>::block_number() as T::BlockNumber;
                         let limit_time = basket + ChainLimit::get().nft_sponsor_transfer_timeout.into();
modifiedpallets/nft/src/tests.rsdiffbeforeafterboth
--- a/pallets/nft/src/tests.rs
+++ b/pallets/nft/src/tests.rs
@@ -1,21 +1,16 @@
 // Tests to be written here
 use crate::mock::*;
-use crate::{AccessMode, ApprovePermissions, CollectionMode, Ownership, ChainLimits};
+use crate::{AccessMode, ApprovePermissions, CollectionMode, Ownership, ChainLimits, CreateItemData, NftItemType, CreateNftData, CreateFungibleData, CreateReFungibleData};
 use frame_support::{assert_noop, assert_ok};
 use frame_system::{ RawOrigin };
 
-// Use cases tests region
-// #region
-#[test]
-fn create_nft_item() {
-    new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
+fn default_collection_numbers_limit() -> u64 {
+    10
+}
 
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
+fn default_limits() {
+    assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
+            collection_numbers_limit: default_collection_numbers_limit(),
             account_token_ownership_limit: 10,
             collections_admins_limit: 5,
             custom_data_limit: 2048,
@@ -23,67 +18,86 @@
             fungible_sponsor_transfer_timeout: 15,
             refungible_sponsor_transfer_timeout: 15,          
         }));
+}
+
+fn default_nft_data() -> CreateItemData {
+    CreateItemData::NFT(CreateNftData { const_data: vec![1, 2, 3], variable_data: vec![3, 2, 1] })
+}
+
+fn default_fungible_data () -> CreateItemData {
+    CreateItemData::Fungible(CreateFungibleData { })
+}
 
-        let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
+fn default_re_fungible_data () -> CreateItemData {
+    CreateItemData::ReFungible(CreateReFungibleData { const_data: vec![1, 2, 3], variable_data: vec![3, 2, 1] })
+}
+
+fn create_test_collection_for_owner(mode: &CollectionMode, owner: u64) -> u64 {
+    let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
+    let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
+    let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
+
+    let collection_id = TemplateModule::nextCollectionID();
+    let origin1 = Origin::signed(owner);
+    assert_ok!(TemplateModule::create_collection(
             origin1.clone(),
             col_name1.clone(),
             col_desc1.clone(),
             token_prefix1.clone(),
             mode
         ));
-        assert_eq!(TemplateModule::collection(1).owner, 1);
+    assert_eq!(TemplateModule::collection(collection_id).owner, owner);
+    return collection_id;
+}
+
+fn create_test_collection(mode: &CollectionMode) -> u64 {
+    return create_test_collection_for_owner(&mode, 1);
+}
 
-        assert_ok!(TemplateModule::create_item(
+fn create_test_item(collection_id: u64, data: &CreateItemData) {
+    let origin1 = Origin::signed(1);
+    assert_ok!(TemplateModule::create_item(
             origin1.clone(),
+            collection_id,
             1,
-            [1, 2, 3].to_vec(),
-            1
+            data.clone()
         ));
-        assert_eq!(TemplateModule::nft_item_id(1, 1).data, [1, 2, 3].to_vec());
-    });
+
 }
 
+// Use cases tests region
+// #region
 #[test]
-fn create_refungible_item() {
+fn create_nft_item() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::ReFungible(2000, 3);
+        default_limits();
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        let data = default_nft_data();
+        create_test_item(collection_id, &data);
+        assert_eq!(TemplateModule::nft_item_id(collection_id, 1).const_data, data.const_data);
+        assert_eq!(TemplateModule::nft_item_id(collection_id, 1).variable_data, data.variable_data);
+    });
+}
 
-        let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-        assert_eq!(TemplateModule::collection(1).owner, 1);
+#[test]
+fn create_refungible_item() {
+    new_test_ext().execute_with(|| {
+        default_limits();
+        let collection_id = create_test_collection(&CollectionMode::ReFungible(3));
 
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
+        let data = default_re_fungible_data();
+        create_test_item(collection_id, &data);
+        assert_eq!(
+            TemplateModule::refungible_item_id(collection_id, 1).const_data,
+            data.const_data
+        );
         assert_eq!(
-            TemplateModule::refungible_item_id(1, 1).data,
-            [1, 2, 3].to_vec()
+            TemplateModule::refungible_item_id(collection_id, 1).variable_data,
+            data.variable_data
         );
         assert_eq!(
-            TemplateModule::refungible_item_id(1, 1).owner[0],
+            TemplateModule::refungible_item_id(collection_id, 1).owner[0],
             Ownership {
                 owner: 1,
                 fraction: 1000
@@ -95,38 +109,12 @@
 #[test]
 fn create_fungible_item() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::Fungible(3);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        let collection_id = create_test_collection(&CollectionMode::Fungible(3));
 
-        let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-        assert_eq!(TemplateModule::collection(1).owner, 1);
+        let data = default_fungible_data();
+        create_test_item(collection_id, &data);
 
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [].to_vec(),
-            1
-        ));
-        assert_eq!(TemplateModule::fungible_item_id(1, 1).owner, 1);
+        assert_eq!(TemplateModule::fungible_item_id(collection_id, 1).owner, 1);
         assert_eq!(TemplateModule::balance_count(1, 1), 1000);
         assert_eq!(TemplateModule::address_tokens(1, 1), [1]);
     });
@@ -135,38 +123,16 @@
 #[test]
 fn transfer_fungible_item() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::Fungible(3);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::Fungible(3));
 
         let origin1 = Origin::signed(1);
         let origin2 = Origin::signed(2);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-        assert_eq!(TemplateModule::collection(1).owner, 1);
 
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [].to_vec(),
-            1
-        ));
+        let data = default_fungible_data();
+        create_test_item(collection_id, &data);
+
         assert_eq!(TemplateModule::fungible_item_id(1, 1).owner, 1);
         assert_eq!(TemplateModule::balance_count(1, 1), 1000);
         assert_eq!(TemplateModule::address_tokens(1, 1), [1]);
@@ -203,44 +169,25 @@
 #[test]
 fn transfer_refungible_item() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::ReFungible(2000, 3);
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::ReFungible(3));
 
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        let data = default_re_fungible_data();
+        create_test_item(collection_id, &data);
 
         let origin1 = Origin::signed(1);
         let origin2 = Origin::signed(2);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-        assert_eq!(TemplateModule::collection(1).owner, 1);
-
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
         assert_eq!(
-            TemplateModule::refungible_item_id(1, 1).data,
-            [1, 2, 3].to_vec()
+            TemplateModule::refungible_item_id(collection_id, 1).const_data,
+            data.const_data
+        );
+        assert_eq!(
+            TemplateModule::refungible_item_id(collection_id, 1).variable_data,
+            data.variable_data
         );
         assert_eq!(
-            TemplateModule::refungible_item_id(1, 1).owner[0],
+            TemplateModule::refungible_item_id(collection_id, 1).owner[0],
             Ownership {
                 owner: 1,
                 fraction: 1000
@@ -310,38 +257,12 @@
 #[test]
 fn transfer_nft_item() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
-        let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-        assert_eq!(TemplateModule::collection(1).owner, 1);
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
-        assert_eq!(TemplateModule::nft_item_id(1, 1).data, [1, 2, 3].to_vec());
+        let data = default_nft_data();
+        create_test_item(collection_id, &data);
         assert_eq!(TemplateModule::balance_count(1, 1), 1);
         assert_eq!(TemplateModule::address_tokens(1, 1), [1]);
 
@@ -358,39 +279,16 @@
 #[test]
 fn nft_approve_and_transfer_from() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        let data = default_nft_data();
+        create_test_item(collection_id, &data);
 
         let origin1 = Origin::signed(1);
         let origin2 = Origin::signed(2);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-        assert_eq!(TemplateModule::collection(1).owner, 1);
 
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
-        assert_eq!(TemplateModule::nft_item_id(1, 1).data, [1, 2, 3].to_vec());
         assert_eq!(TemplateModule::balance_count(1, 1), 1);
         assert_eq!(TemplateModule::address_tokens(1, 1), [1]);
 
@@ -436,49 +334,16 @@
 #[test]
 fn refungible_approve_and_transfer_from() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::ReFungible(2000, 3);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::ReFungible(3));
+        
         let origin1 = Origin::signed(1);
         let origin2 = Origin::signed(2);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-        assert_eq!(TemplateModule::collection(1).owner, 1);
 
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
-        assert_eq!(
-            TemplateModule::refungible_item_id(1, 1).data,
-            [1, 2, 3].to_vec()
-        );
-        assert_eq!(
-            TemplateModule::refungible_item_id(1, 1).owner[0],
-            Ownership {
-                owner: 1,
-                fraction: 1000
-            }
-        );
+        let data = default_re_fungible_data();
+        create_test_item(collection_id, &data);
+
         assert_eq!(TemplateModule::balance_count(1, 1), 1000);
         assert_eq!(TemplateModule::address_tokens(1, 1), [1]);
 
@@ -536,39 +401,16 @@
 #[test]
 fn fungible_approve_and_transfer_from() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::Fungible(3);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::Fungible(3));
+        
+        let data = default_fungible_data();
+        create_test_item(collection_id, &data);
 
         let origin1 = Origin::signed(1);
         let origin2 = Origin::signed(2);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-        assert_eq!(TemplateModule::collection(1).owner, 1);
 
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [].to_vec(),
-            1
-        ));
-        assert_eq!(TemplateModule::fungible_item_id(1, 1).owner, 1);
         assert_eq!(TemplateModule::balance_count(1, 1), 1000);
         assert_eq!(TemplateModule::address_tokens(1, 1), [1]);
 
@@ -642,104 +484,45 @@
 #[test]
 fn change_collection_owner() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
+        
         let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
         assert_ok!(TemplateModule::change_collection_owner(
             origin1.clone(),
-            1,
+            collection_id,
             2
         ));
-        assert_eq!(TemplateModule::collection(1).owner, 2);
+        assert_eq!(TemplateModule::collection(collection_id).owner, 2);
     });
 }
 
 #[test]
 fn destroy_collection() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
+        
         let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-        assert_ok!(TemplateModule::destroy_collection(origin1.clone(), 1));
+        assert_ok!(TemplateModule::destroy_collection(origin1.clone(), collection_id));
     });
 }
 
 #[test]
 fn burn_nft_item() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
         let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), 1, 2));
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
+        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), collection_id, 2));
+        
+        let data = default_nft_data();
+        create_test_item(collection_id, &data);
 
-        assert_eq!(TemplateModule::nft_item_id(1, 1).data, [1, 2, 3].to_vec());
-
         // check balance (collection with id = 1, user id = 1)
         assert_eq!(TemplateModule::balance_count(1, 1), 1);
 
@@ -757,36 +540,15 @@
 #[test]
 fn burn_fungible_item() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::Fungible(3);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::Fungible(3));
+        
         let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), 1, 2));
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [].to_vec(),
-            1
-        ));
+        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), collection_id, 2));
+        
+        let data = default_fungible_data();
+        create_test_item(collection_id, &data);
 
         // check balance (collection with id = 1, user id = 1)
         assert_eq!(TemplateModule::balance_count(1, 1), 1000);
@@ -805,55 +567,28 @@
 #[test]
 fn burn_refungible_item() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::ReFungible(200, 3);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::ReFungible(3));
         let origin1 = Origin::signed(1);
         let origin2 = Origin::signed(2);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
 
         assert_ok!(TemplateModule::set_mint_permission(
             origin1.clone(),
-            1,
+            collection_id,
             true
         ));
         assert_ok!(TemplateModule::set_public_access_mode(
             origin1.clone(),
-            1,
+            collection_id,
             AccessMode::WhiteList
         ));
         assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 1));
 
         assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), 1, 2));
-        assert_ok!(TemplateModule::create_item(
-            origin2.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
-
-        assert_eq!(
-            TemplateModule::refungible_item_id(1, 1).data,
-            [1, 2, 3].to_vec()
-        );
+        
+        let data = default_re_fungible_data();
+        create_test_item(collection_id, &data);
 
         // check balance (collection with id = 1, user id = 2)
         assert_eq!(TemplateModule::balance_count(1, 1), 1000);
@@ -872,110 +607,38 @@
 #[test]
 fn add_collection_admin() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
+        default_limits();
+        
+        let collection1_id = create_test_collection_for_owner(&CollectionMode::NFT, 1);
+        create_test_collection_for_owner(&CollectionMode::NFT, 2);
+        create_test_collection_for_owner(&CollectionMode::NFT, 3);
+        
         let origin1 = Origin::signed(1);
-        let origin2 = Origin::signed(2);
-        let origin3 = Origin::signed(3);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode.clone()
-        ));
-        assert_ok!(TemplateModule::create_collection(
-            origin2.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode.clone()
-        ));
-        assert_ok!(TemplateModule::create_collection(
-            origin3.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode.clone()
-        ));
-
-        assert_eq!(TemplateModule::collection(1).owner, 1);
-        assert_eq!(TemplateModule::collection(2).owner, 2);
-        assert_eq!(TemplateModule::collection(3).owner, 3);
 
         // collection admin
-        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), 1, 2));
-        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), 1, 3));
+        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), collection1_id, 2));
+        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), collection1_id, 3));
 
-        assert_eq!(TemplateModule::admin_list_collection(1).contains(&2), true);
-        assert_eq!(TemplateModule::admin_list_collection(1).contains(&3), true);
+        assert_eq!(TemplateModule::admin_list_collection(collection1_id).contains(&2), true);
+        assert_eq!(TemplateModule::admin_list_collection(collection1_id).contains(&3), true);
     });
 }
 
 #[test]
 fn remove_collection_admin() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
+        default_limits();
+        
+        let collection1_id = create_test_collection_for_owner(&CollectionMode::NFT, 1);
+        create_test_collection_for_owner(&CollectionMode::NFT, 2);
+        create_test_collection_for_owner(&CollectionMode::NFT, 3);
 
         let origin1 = Origin::signed(1);
         let origin2 = Origin::signed(2);
-        let origin3 = Origin::signed(3);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode.clone()
-        ));
-        assert_ok!(TemplateModule::create_collection(
-            origin2.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode.clone()
-        ));
-        assert_ok!(TemplateModule::create_collection(
-            origin3.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode.clone()
-        ));
-
-        assert_eq!(TemplateModule::collection(1).owner, 1);
-        assert_eq!(TemplateModule::collection(2).owner, 2);
-        assert_eq!(TemplateModule::collection(3).owner, 3);
 
         // collection admin
-        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), 1, 2));
-        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), 1, 3));
+        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), collection1_id, 2));
+        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), collection1_id, 3));
 
         assert_eq!(TemplateModule::admin_list_collection(1).contains(&2), true);
         assert_eq!(TemplateModule::admin_list_collection(1).contains(&3), true);
@@ -993,125 +656,50 @@
 #[test]
 fn balance_of() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let nft_mode: CollectionMode = CollectionMode::NFT(2000);
-        let furg_mode: CollectionMode = CollectionMode::Fungible(3);
-        let refung_mode: CollectionMode = CollectionMode::ReFungible(2000, 3);
-
+        default_limits();
+        
+        let nft_collection_id = create_test_collection(&CollectionMode::NFT);
+        let fungible_collection_id = create_test_collection(&CollectionMode::Fungible(3));
+        let re_fungible_collection_id = create_test_collection(&CollectionMode::ReFungible(3));
+        
         let origin1 = Origin::signed(1);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            nft_mode.clone()
-        ));
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            furg_mode.clone()
-        ));
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            refung_mode.clone()
-        ));
-
-        assert_eq!(TemplateModule::collection(1).owner, 1);
-        assert_eq!(TemplateModule::collection(2).owner, 1);
-        assert_eq!(TemplateModule::collection(3).owner, 1);
 
         // check balance before
-        assert_eq!(TemplateModule::balance_count(1, 1), 0);
-        assert_eq!(TemplateModule::balance_count(2, 1), 0);
-        assert_eq!(TemplateModule::balance_count(3, 1), 0);
+        assert_eq!(TemplateModule::balance_count(nft_collection_id, 1), 0);
+        assert_eq!(TemplateModule::balance_count(fungible_collection_id, 1), 0);
+        assert_eq!(TemplateModule::balance_count(re_fungible_collection_id, 1), 0);
 
-        // create item
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 1, 1].to_vec(),
-            1
-        ));
-
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            2,
-            [].to_vec(),
-            1
-        ));
-
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            3,
-            [1, 1, 1].to_vec(),
-            1
-        ));
+        let nft_data = default_nft_data();
+        create_test_item(nft_collection_id, &nft_data);
+        
+        let fungible_data = default_fungible_data();
+        create_test_item(fungible_collection_id, &fungible_data);
+        
+        let re_fungible_data = default_re_fungible_data();
+        create_test_item(re_fungible_collection_id, &re_fungible_data);
 
         // check balance (collection with id = 1, user id = 1)
-        assert_eq!(TemplateModule::balance_count(1, 1), 1);
-        assert_eq!(TemplateModule::balance_count(2, 1), 1000);
-        assert_eq!(TemplateModule::balance_count(3, 1), 1000);
-        assert_eq!(TemplateModule::nft_item_id(1, 1).owner, 1);
-        assert_eq!(TemplateModule::fungible_item_id(2, 1).owner, 1);
-        assert_eq!(TemplateModule::refungible_item_id(3, 1).owner[0].owner, 1);
+        assert_eq!(TemplateModule::balance_count(nft_collection_id, 1), 1);
+        assert_eq!(TemplateModule::balance_count(fungible_collection_id, 1), 1000);
+        assert_eq!(TemplateModule::balance_count(re_fungible_collection_id, 1), 1000);
+        assert_eq!(TemplateModule::nft_item_id(nft_collection_id, 1).owner, 1);
+        assert_eq!(TemplateModule::fungible_item_id(fungible_collection_id, 1).owner, 1);
+        assert_eq!(TemplateModule::refungible_item_id(re_fungible_collection_id, 1).owner[0].owner, 1);
     });
 }
 
 #[test]
 fn approve() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let nft_mode: CollectionMode = CollectionMode::NFT(2000);
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
+        
+        let data = default_nft_data();
+        create_test_item(collection_id, &data);
+
         let origin1 = Origin::signed(1);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            nft_mode.clone()
-        ));
-
-        assert_eq!(TemplateModule::collection(1).owner, 1);
-
-        // create item
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 1, 1].to_vec(),
-            1
-        ));
-
+        
         // approve
         assert_ok!(TemplateModule::approve(origin1.clone(), 2, 1, 1));
         assert_eq!(TemplateModule::approved(1, (1, 1))[0].approved, 2);
@@ -1121,40 +709,14 @@
 #[test]
 fn transfer_from() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
         let origin1 = Origin::signed(1);
         let origin2 = Origin::signed(2);
 
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-
-        assert_eq!(TemplateModule::collection(1).owner, 1);
-
-        // create item
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 1, 1].to_vec(),
-            1
-        ));
+        let data = default_nft_data();
+        create_test_item(collection_id, &data);
 
         // approve
         assert_ok!(TemplateModule::approve(origin1.clone(), 2, 1, 1));
@@ -1197,99 +759,41 @@
 #[test]
 fn owner_can_add_address_to_white_list() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
+
         let origin1 = Origin::signed(1);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-
-        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 2));
-        assert_eq!(TemplateModule::white_list(1)[0], 2);
+        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), collection_id, 2));
+        assert_eq!(TemplateModule::white_list(collection_id)[0], 2);
     });
 }
 
 #[test]
 fn admin_can_add_address_to_white_list() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
         let origin1 = Origin::signed(1);
         let origin2 = Origin::signed(2);
 
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-
-        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), 1, 2));
-        assert_ok!(TemplateModule::add_to_white_list(origin2.clone(), 1, 3));
-        assert_eq!(TemplateModule::white_list(1)[0], 3);
+        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), collection_id, 2));
+        assert_ok!(TemplateModule::add_to_white_list(origin2.clone(), collection_id, 3));
+        assert_eq!(TemplateModule::white_list(collection_id)[0], 3);
     });
 }
 
 #[test]
 fn nonprivileged_user_cannot_add_address_to_white_list() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-        let origin1 = Origin::signed(1);
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
+
         let origin2 = Origin::signed(2);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-
         assert_noop!(
-            TemplateModule::add_to_white_list(origin2.clone(), 1, 3),
+            TemplateModule::add_to_white_list(origin2.clone(), collection_id, 3),
             "You do not have permissions to modify this collection"
         );
     });
@@ -1298,17 +802,9 @@
 #[test]
 fn nobody_can_add_address_to_white_list_of_nonexisting_collection() {
     new_test_ext().execute_with(|| {
+        default_limits();
+
         let origin1 = Origin::signed(1);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
 
         assert_noop!(
             TemplateModule::add_to_white_list(origin1.clone(), 1, 2),
@@ -1320,33 +816,13 @@
 #[test]
 fn nobody_can_add_address_to_white_list_of_deleted_collection() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-        let origin1 = Origin::signed(1);
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-
-        assert_ok!(TemplateModule::destroy_collection(origin1.clone(), 1));
+        assert_ok!(TemplateModule::destroy_collection(origin1.clone(), collection_id));
         assert_noop!(
-            TemplateModule::add_to_white_list(origin1.clone(), 1, 2),
+            TemplateModule::add_to_white_list(origin1.clone(), collection_id, 2),
             "This collection does not exist"
         );
     });
@@ -1356,165 +832,80 @@
 #[test]
 fn address_is_already_added_to_white_list() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
         let origin1 = Origin::signed(1);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-
-        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 2));
-        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 2));
-        assert_eq!(TemplateModule::white_list(1)[0], 2);
-        assert_eq!(TemplateModule::white_list(1).len(), 1);
+        
+        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), collection_id, 2));
+        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), collection_id, 2));
+        assert_eq!(TemplateModule::white_list(collection_id)[0], 2);
+        assert_eq!(TemplateModule::white_list(collection_id).len(), 1);
     });
 }
 
 #[test]
 fn owner_can_remove_address_from_white_list() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-        let origin1 = Origin::signed(1);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
-        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 2));
+        let origin1 = Origin::signed(1);
+        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), collection_id, 2));
         assert_ok!(TemplateModule::remove_from_white_list(
             origin1.clone(),
-            1,
+            collection_id,
             2
         ));
-        assert_eq!(TemplateModule::white_list(1).len(), 0);
+        assert_eq!(TemplateModule::white_list(collection_id).len(), 0);
     });
 }
 
 #[test]
 fn admin_can_remove_address_from_white_list() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
         let origin1 = Origin::signed(1);
         let origin2 = Origin::signed(2);
 
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), collection_id, 2));
 
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-
-        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), 1, 2));
-
-        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 3));
+        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), collection_id, 3));
         assert_ok!(TemplateModule::remove_from_white_list(
             origin2.clone(),
-            1,
+            collection_id,
             3
         ));
-        assert_eq!(TemplateModule::white_list(1).len(), 0);
+        assert_eq!(TemplateModule::white_list(collection_id).len(), 0);
     });
 }
 
 #[test]
 fn nonprivileged_user_cannot_remove_address_from_white_list() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
         let origin1 = Origin::signed(1);
         let origin2 = Origin::signed(2);
 
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-
-        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 2));
+        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), collection_id, 2));
         assert_noop!(
-            TemplateModule::remove_from_white_list(origin2.clone(), 1, 2),
+            TemplateModule::remove_from_white_list(origin2.clone(), collection_id, 2),
             "You do not have permissions to modify this collection"
         );
-        assert_eq!(TemplateModule::white_list(1)[0], 2);
+        assert_eq!(TemplateModule::white_list(collection_id)[0], 2);
     });
 }
 
 #[test]
 fn nobody_can_remove_address_from_white_list_of_nonexisting_collection() {
     new_test_ext().execute_with(|| {
+        default_limits();
         let origin1 = Origin::signed(1);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
 
         assert_noop!(
             TemplateModule::remove_from_white_list(origin1.clone(), 1, 2),
@@ -1526,38 +917,19 @@
 #[test]
 fn nobody_can_remove_address_from_white_list_of_deleted_collection() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
         let origin1 = Origin::signed(1);
         let origin2 = Origin::signed(2);
 
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-
-        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 2));
-        assert_ok!(TemplateModule::destroy_collection(origin1.clone(), 1));
+        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), collection_id, 2));
+        assert_ok!(TemplateModule::destroy_collection(origin1.clone(), collection_id));
         assert_noop!(
-            TemplateModule::remove_from_white_list(origin2.clone(), 1, 2),
+            TemplateModule::remove_from_white_list(origin2.clone(), collection_id, 2),
             "This collection does not exist"
         );
-        assert_eq!(TemplateModule::white_list(1).len(), 0);
+        assert_eq!(TemplateModule::white_list(collection_id).len(), 0);
     });
 }
 
@@ -1565,42 +937,23 @@
 #[test]
 fn address_is_already_removed_from_white_list() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
         let origin1 = Origin::signed(1);
 
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-
-        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 2));
+        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), collection_id, 2));
         assert_ok!(TemplateModule::remove_from_white_list(
             origin1.clone(),
-            1,
+            collection_id,
             2
         ));
         assert_ok!(TemplateModule::remove_from_white_list(
             origin1.clone(),
-            1,
+            collection_id,
             2
         ));
-        assert_eq!(TemplateModule::white_list(1).len(), 0);
+        assert_eq!(TemplateModule::white_list(collection_id).len(), 0);
     });
 }
 
@@ -1608,44 +961,21 @@
 #[test]
 fn white_list_test_1() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
         let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-        assert_eq!(TemplateModule::collection(1).owner, 1);
-
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
+        
+        let data = default_nft_data();
+        create_test_item(collection_id, &data);
 
         assert_ok!(TemplateModule::set_public_access_mode(
             origin1.clone(),
-            1,
+            collection_id,
             AccessMode::WhiteList
         ));
-        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 2));
+        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), collection_id, 2));
 
         assert_noop!(
             TemplateModule::transfer(origin1.clone(), 3, 1, 1, 1),
@@ -1657,41 +987,17 @@
 #[test]
 fn white_list_test_2() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
         let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-        assert_eq!(TemplateModule::collection(1).owner, 1);
-
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
+        
+        let data = default_nft_data();
+        create_test_item(collection_id, &data);
 
         assert_ok!(TemplateModule::set_public_access_mode(
             origin1.clone(),
-            1,
+            collection_id,
             AccessMode::WhiteList
         ));
         assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 1));
@@ -1718,41 +1024,18 @@
 #[test]
 fn white_list_test_3() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
         let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-        assert_eq!(TemplateModule::collection(1).owner, 1);
-
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
+        
+        let data = default_nft_data();
+        create_test_item(collection_id, &data);
 
         assert_ok!(TemplateModule::set_public_access_mode(
             origin1.clone(),
-            1,
+            collection_id,
             AccessMode::WhiteList
         ));
         assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 1));
@@ -1767,45 +1050,22 @@
 #[test]
 fn white_list_test_4() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
         let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-        assert_eq!(TemplateModule::collection(1).owner, 1);
 
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
+        let data = default_nft_data();
+        create_test_item(collection_id, &data);
 
         assert_ok!(TemplateModule::set_public_access_mode(
             origin1.clone(),
-            1,
+            collection_id,
             AccessMode::WhiteList
         ));
-        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 1));
-        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 2));
+        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), collection_id, 1));
+        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), collection_id, 2));
 
         // do approve
         assert_ok!(TemplateModule::approve(origin1.clone(), 1, 1, 1));
@@ -1813,7 +1073,7 @@
 
         assert_ok!(TemplateModule::remove_from_white_list(
             origin1.clone(),
-            1,
+            collection_id,
             2
         ));
 
@@ -1828,41 +1088,18 @@
 #[test]
 fn white_list_test_5() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
         let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-        assert_eq!(TemplateModule::collection(1).owner, 1);
 
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
+        let data = default_nft_data();
+        create_test_item(collection_id, &data);
 
         assert_ok!(TemplateModule::set_public_access_mode(
             origin1.clone(),
-            1,
+            collection_id,
             AccessMode::WhiteList
         ));
         assert_noop!(
@@ -1876,32 +1113,14 @@
 #[test]
 fn white_list_test_6() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
         let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
         assert_ok!(TemplateModule::set_public_access_mode(
             origin1.clone(),
-            1,
+            collection_id,
             AccessMode::WhiteList
         ));
 
@@ -1918,45 +1137,22 @@
 #[test]
 fn white_list_test_7() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
+        let data = default_nft_data();
+        create_test_item(collection_id, &data);
+        
         let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-        assert_eq!(TemplateModule::collection(1).owner, 1);
-
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
 
         assert_ok!(TemplateModule::set_public_access_mode(
             origin1.clone(),
-            1,
+            collection_id,
             AccessMode::WhiteList
         ));
-        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 1));
-        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 2));
+        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), collection_id, 1));
+        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), collection_id, 2));
 
         assert_ok!(TemplateModule::transfer(origin1.clone(), 2, 1, 1, 1));
     });
@@ -1965,45 +1161,22 @@
 #[test]
 fn white_list_test_8() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
+        let data = default_nft_data();
+        create_test_item(collection_id, &data);
+        
         let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-        assert_eq!(TemplateModule::collection(1).owner, 1);
-
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
 
         assert_ok!(TemplateModule::set_public_access_mode(
             origin1.clone(),
-            1,
+            collection_id,
             AccessMode::WhiteList
         ));
-        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 1));
-        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 2));
+        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), collection_id, 1));
+        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), collection_id, 2));
 
         // do approve
         assert_ok!(TemplateModule::approve(origin1.clone(), 1, 1, 1));
@@ -2024,47 +1197,24 @@
 #[test]
 fn white_list_test_9() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
         let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
 
         assert_ok!(TemplateModule::set_public_access_mode(
             origin1.clone(),
-            1,
+            collection_id,
             AccessMode::WhiteList
         ));
         assert_ok!(TemplateModule::set_mint_permission(
             origin1.clone(),
-            1,
+            collection_id,
             false
         ));
 
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
+        let data = default_nft_data();
+        create_test_item(collection_id, &data);
     });
 }
 
@@ -2072,49 +1222,31 @@
 #[test]
 fn white_list_test_10() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
         let origin1 = Origin::signed(1);
         let origin2 = Origin::signed(2);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
 
         assert_ok!(TemplateModule::set_public_access_mode(
             origin1.clone(),
-            1,
+            collection_id,
             AccessMode::WhiteList
         ));
         assert_ok!(TemplateModule::set_mint_permission(
             origin1.clone(),
-            1,
+            collection_id,
             false
         ));
 
-        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), 1, 2));
+        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), collection_id, 2));
 
         assert_ok!(TemplateModule::create_item(
             origin2.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            2
+            collection_id,
+            2,
+            default_nft_data()
         ));
     });
 }
@@ -2123,45 +1255,27 @@
 #[test]
 fn white_list_test_11() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
         let origin1 = Origin::signed(1);
         let origin2 = Origin::signed(2);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
 
         assert_ok!(TemplateModule::set_public_access_mode(
             origin1.clone(),
-            1,
+            collection_id,
             AccessMode::WhiteList
         ));
         assert_ok!(TemplateModule::set_mint_permission(
             origin1.clone(),
-            1,
+            collection_id,
             false
         ));
-        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 2));
+        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), collection_id, 2));
 
         assert_noop!(
-            TemplateModule::create_item(origin2.clone(), 1, [1, 2, 3].to_vec(), 2),
+            TemplateModule::create_item(origin2.clone(), 1, vec![1, 2, 3], 2),
             "Public minting is not allowed for this collection"
         );
     });
@@ -2171,44 +1285,26 @@
 #[test]
 fn white_list_test_12() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
         let origin1 = Origin::signed(1);
         let origin2 = Origin::signed(2);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
 
         assert_ok!(TemplateModule::set_public_access_mode(
             origin1.clone(),
-            1,
+            collection_id,
             AccessMode::WhiteList
         ));
         assert_ok!(TemplateModule::set_mint_permission(
             origin1.clone(),
-            1,
+            collection_id,
             false
         ));
 
         assert_noop!(
-            TemplateModule::create_item(origin2.clone(), 1, [1, 2, 3].to_vec(), 2),
+            TemplateModule::create_item(origin2.clone(), 1, vec![1, 2, 3], 2),
             "Public minting is not allowed for this collection"
         );
     });
@@ -2218,47 +1314,25 @@
 #[test]
 fn white_list_test_13() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
         let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
 
         assert_ok!(TemplateModule::set_public_access_mode(
             origin1.clone(),
-            1,
+            collection_id,
             AccessMode::WhiteList
         ));
         assert_ok!(TemplateModule::set_mint_permission(
             origin1.clone(),
-            1,
+            collection_id,
             true
         ));
 
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
+        let data = default_nft_data();
+        create_test_item(collection_id, &data);
     });
 }
 
@@ -2266,49 +1340,31 @@
 #[test]
 fn white_list_test_14() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
         let origin1 = Origin::signed(1);
         let origin2 = Origin::signed(2);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
 
         assert_ok!(TemplateModule::set_public_access_mode(
             origin1.clone(),
-            1,
+            collection_id,
             AccessMode::WhiteList
         ));
         assert_ok!(TemplateModule::set_mint_permission(
             origin1.clone(),
-            1,
+            collection_id,
             true
         ));
 
-        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), 1, 2));
+        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), collection_id, 2));
 
         assert_ok!(TemplateModule::create_item(
             origin2.clone(),
             1,
-            [1, 2, 3].to_vec(),
-            2
+            2,
+            default_nft_data()
         ));
     });
 }
@@ -2317,44 +1373,26 @@
 #[test]
 fn white_list_test_15() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
         let origin1 = Origin::signed(1);
         let origin2 = Origin::signed(2);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
 
         assert_ok!(TemplateModule::set_public_access_mode(
             origin1.clone(),
-            1,
+            collection_id,
             AccessMode::WhiteList
         ));
         assert_ok!(TemplateModule::set_mint_permission(
             origin1.clone(),
-            1,
+            collection_id,
             true
         ));
 
         assert_noop!(
-            TemplateModule::create_item(origin2.clone(), 1, [1, 2, 3].to_vec(), 2),
+            TemplateModule::create_item(origin2.clone(), 1, 2, default_nft_data()),
             "Address is not in white list"
         );
     });
@@ -2364,48 +1402,30 @@
 #[test]
 fn white_list_test_16() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
         let origin1 = Origin::signed(1);
         let origin2 = Origin::signed(2);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
 
         assert_ok!(TemplateModule::set_public_access_mode(
             origin1.clone(),
-            1,
+            collection_id,
             AccessMode::WhiteList
         ));
         assert_ok!(TemplateModule::set_mint_permission(
             origin1.clone(),
-            1,
+            collection_id,
             true
         ));
-        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), 1, 2));
+        assert_ok!(TemplateModule::add_to_white_list(origin1.clone(), collection_id, 2));
 
         assert_ok!(TemplateModule::create_item(
             origin2.clone(),
             1,
-            [1, 2, 3].to_vec(),
-            2
+            2,
+            default_nft_data()
         ));
     });
 }
@@ -2414,29 +1434,9 @@
 #[test]
 fn total_number_collections_bound() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
-        let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
+        default_limits();
+        
+        create_test_collection(&CollectionMode::NFT);
     });
 }
 
@@ -2444,32 +1444,12 @@
 #[test]
 fn total_number_collections_bound_neg() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
+        default_limits();
 
         let origin1 = Origin::signed(1);
 
-        for _ in 0..10 {
-
-            assert_ok!(TemplateModule::create_collection(
-                origin1.clone(),
-                col_name1.clone(),
-                col_desc1.clone(),
-                token_prefix1.clone(),
-                mode.clone()
-            ));
+        for _ in 0..default_collection_numbers_limit() {
+            create_test_collection(&CollectionMode::NFT)
         }
 
         // 11-th collection in chain. Expects error
@@ -2487,43 +1467,13 @@
 #[test]
 fn owned_tokens_bound() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
-        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
-            collection_numbers_limit: 10,
-            account_token_ownership_limit: 10,
-            collections_admins_limit: 5,
-            custom_data_limit: 2048,
-            nft_sponsor_transfer_timeout: 15,
-            fungible_sponsor_transfer_timeout: 15,
-            refungible_sponsor_transfer_timeout: 15,          
-        }));
-
-        let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
-
-        assert_ok!(TemplateModule::create_item(
-            origin1.clone(),
-            1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
+        let data = default_nft_data();
+        create_test_item(collection_id, &data);
+        create_test_item(collection_id, &data);
     });
 }
 
@@ -2531,11 +1481,6 @@
 #[test]
 fn owned_tokens_bound_neg() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
         assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
             collection_numbers_limit: 10,
             account_token_ownership_limit: 1,
@@ -2545,28 +1490,18 @@
             fungible_sponsor_transfer_timeout: 15,
             refungible_sponsor_transfer_timeout: 15,          
         }));
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
         let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
+        let data = default_nft_data();
+        create_test_item(collection_id, &data);
 
-        assert_ok!(TemplateModule::create_item(
+        assert_noop!(TemplateModule::create_item(
             origin1.clone(),
             1,
-            [1, 2, 3].to_vec(),
-            1
-        ));
-
-        assert_noop!(TemplateModule::create_item(
-            origin1.clone(),
             1,
-            [1, 2, 3].to_vec(),
-            1
+            data
         ), "Owned tokens by a single address bound exceeded");
     });
 }
@@ -2575,11 +1510,6 @@
 #[test]
 fn collection_admins_bound() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
         assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
             collection_numbers_limit: 10,
             account_token_ownership_limit: 10,
@@ -2589,18 +1519,13 @@
             fungible_sponsor_transfer_timeout: 15,
             refungible_sponsor_transfer_timeout: 15,          
         }));
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
         let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
-
-        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), 1, 2));
-        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), 1, 3));
+        
+        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), collection_id, 2));
+        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), collection_id, 3));
     });
 }
 
@@ -2608,11 +1533,6 @@
 #[test]
 fn collection_admins_bound_neg() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
-
         assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
             collection_numbers_limit: 10,
             account_token_ownership_limit: 1,
@@ -2622,78 +1542,167 @@
             fungible_sponsor_transfer_timeout: 15,
             refungible_sponsor_transfer_timeout: 15,          
         }));
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
 
         let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
-            origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
 
-        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), 1, 2));
-        assert_noop!(TemplateModule::add_collection_admin(origin1.clone(), 1, 3), "Number of collection admins bound exceeded");
+        assert_ok!(TemplateModule::add_collection_admin(origin1.clone(), collection_id, 2));
+        assert_noop!(TemplateModule::add_collection_admin(origin1.clone(), collection_id, 3), "Number of collection admins bound exceeded");
     });
 }
 
-// Custom data size. Positive test
+// NFT custom data size. Negative test const_data.
 #[test]
-fn custom_data_size_bound() {
+fn custom_data_size_nft_const_data_bound_neg() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
+        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
+            collection_numbers_limit: 10,
+            account_token_ownership_limit: 10,
+            collections_admins_limit: 5,
+            custom_data_limit: 2,
+            nft_sponsor_transfer_timeout: 15,
+            fungible_sponsor_transfer_timeout: 15,
+            refungible_sponsor_transfer_timeout: 15,          
+        }));
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
+
+        let origin1 = Origin::signed(1);
+        let too_big_const_data = CreateItemData::NFT(CreateNftData{
+            const_data: vec![1, 2, 3, 4],
+            variable_data: vec![]
+        });
+
+        assert_noop!(TemplateModule::create_item(
+            origin1.clone(),
+            collection_id,
+            1,
+            too_big_const_data
+        ), "const_data exceeded data limit: 2.");
+    });
+}
 
+// NFT custom data size. Negative test variable_data.
+#[test]
+fn custom_data_size_nft_variable_data_bound_neg() {
+    new_test_ext().execute_with(|| {
         assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
             collection_numbers_limit: 10,
             account_token_ownership_limit: 10,
             collections_admins_limit: 5,
-            custom_data_limit: 2048,
+            custom_data_limit: 2,
             nft_sponsor_transfer_timeout: 15,
             fungible_sponsor_transfer_timeout: 15,
             refungible_sponsor_transfer_timeout: 15,          
         }));
 
+        let collection_id = create_test_collection(&CollectionMode::NFT);
+
         let origin1 = Origin::signed(1);
-        assert_ok!(TemplateModule::create_collection(
+        let too_big_const_data = CreateItemData::NFT(CreateNftData{
+            const_data: vec![],
+            variable_data: vec![1, 2, 3, 4]
+        });
+
+        assert_noop!(TemplateModule::create_item(
             origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ));
+            collection_id,
+            1,
+            too_big_const_data
+        ), "variable_data exceeded data limit: 2.");
     });
 }
 
-// Custom data size. Negotive test
+// Re fungible custom data size. Negative test const_data.
 #[test]
-fn custom_data_size_bound_neg() {
+fn custom_data_size_re_fungible_const_data_bound_neg() {
     new_test_ext().execute_with(|| {
-        let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
-        let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
-        let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
-        let mode: CollectionMode = CollectionMode::NFT(2000);
+        assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
+            collection_numbers_limit: 10,
+            account_token_ownership_limit: 10,
+            collections_admins_limit: 5,
+            custom_data_limit: 2,
+            nft_sponsor_transfer_timeout: 15,
+            fungible_sponsor_transfer_timeout: 15,
+            refungible_sponsor_transfer_timeout: 15,          
+        }));
+
+        let collection_id = create_test_collection(&CollectionMode::NFT);
+
+        let origin1 = Origin::signed(1);
+        let too_big_const_data = CreateItemData::NFT(CreateNftData{
+            const_data: vec![1, 2, 3, 4],
+            variable_data: vec![]
+        });
+
+        assert_noop!(TemplateModule::create_item(
+            origin1.clone(),
+            collection_id,
+            1,
+            too_big_const_data
+        ), "const_data exceeded data limit: 2.");
+    });
+}
 
+// Re fungible custom data size. Negative test variable_data.
+#[test]
+fn custom_data_size_re_fungible_variable_data_bound_neg() {
+    new_test_ext().execute_with(|| {
         assert_ok!(TemplateModule::set_chain_limits(RawOrigin::Root.into(), ChainLimits { 
             collection_numbers_limit: 10,
             account_token_ownership_limit: 10,
             collections_admins_limit: 5,
-            custom_data_limit: 200,
+            custom_data_limit: 2,
             nft_sponsor_transfer_timeout: 15,
             fungible_sponsor_transfer_timeout: 15,
             refungible_sponsor_transfer_timeout: 15,          
         }));
 
+        let collection_id = create_test_collection(&CollectionMode::NFT);
+
         let origin1 = Origin::signed(1);
-        assert_noop!(TemplateModule::create_collection(
+        let too_big_const_data = CreateItemData::NFT(CreateNftData{
+            const_data: vec![],
+            variable_data: vec![1, 2, 3, 4]
+        });
+
+        assert_noop!(TemplateModule::create_item(
             origin1.clone(),
-            col_name1.clone(),
-            col_desc1.clone(),
-            token_prefix1.clone(),
-            mode
-        ), "Custom data size bound exceeded");
+            collection_id,
+            1,
+            too_big_const_data
+        ), "variable_data exceeded data limit: 2.");
     });
 }
 // #endregion
+
+#[test]
+fn set_const_on_chain_schema() {
+    new_test_ext().execute_with(|| {
+        default_limits();
+
+        let collection_id = create_test_collection(&CollectionMode::NFT);
+
+        let origin1 = Origin::signed(1);
+        assert_ok!(TemplateModule::set_const_on_chain_schema(origin1, collection_id, "test const on chain schema".to_vec()));
+
+        assert_eq!(TemplateModule::collection(collection_id).const_on_chain_schema, "test const on chain schema".to_vec());
+        assert_eq!(TemplateModule::collection(collection_id).variable_on_chain_schema, "".to_vec());
+    });
+}
+
+#[test]
+fn set_variable_on_chain_schema() {
+    new_test_ext().execute_with(|| {
+        default_limits();
+        
+        let collection_id = create_test_collection(&CollectionMode::NFT);
+
+        let origin1 = Origin::signed(1);
+        assert_ok!(TemplateModule::set_variable_on_chain_schema(origin1, collection_id, "test variable on chain schema".to_vec()));
+
+        assert_eq!(TemplateModule::collection(collection_id).const_on_chain_schema, "".to_vec());
+        assert_eq!(TemplateModule::collection(collection_id).variable_on_chain_schema, "test variable on chain schema".to_vec());
+    });
+}
\ No newline at end of file
modifiedruntime/src/nft_weights.rsdiffbeforeafterboth
93 .saturating_add(DbWeight::get().reads(2 as Weight))93 .saturating_add(DbWeight::get().reads(2 as Weight))
94 .saturating_add(DbWeight::get().writes(1 as Weight))94 .saturating_add(DbWeight::get().writes(1 as Weight))
95 }95 }
96 fn set_const_on_chain_schema() -> Weight {
97 (11_100_000 as Weight)
98 .saturating_add(DbWeight::get().reads(2 as Weight))
99 .saturating_add(DbWeight::get().writes(1 as Weight))
100 }
101 fn set_variable_on_chain_schema() -> Weight {
102 (11_100_000 as Weight)
103 .saturating_add(DbWeight::get().reads(2 as Weight))
104 .saturating_add(DbWeight::get().writes(1 as Weight))
105 }
106 fn set_variable_meta_data() -> Weight {
107 (17_500_000 as Weight)
108 .saturating_add(DbWeight::get().reads(2 as Weight))
109 .saturating_add(DbWeight::get().writes(1 as Weight))
110 }
96}111}
97112