--- a/tests/src/contracts.test.ts
+++ b/tests/src/contracts.test.ts
@@ -16,9 +16,15 @@
 } from "./util/contracthelpers";
 
 import {
+  addToWhiteListExpectSuccess,
+  approveExpectSuccess,
   createCollectionExpectSuccess,
   createItemExpectSuccess,
-  getGenericResult
+  enablePublicMintingExpectSuccess,
+  enableWhiteListExpectSuccess,
+  getGenericResult,
+  isWhitelisted,
+  transferFromExpectSuccess
 } from "./util/helpers";
 
 
@@ -26,7 +32,7 @@
 const expect = chai.expect;
 
 const value = 0;
-const gasLimit = 3000n * 1000000n;
+const gasLimit = 9000n * 1000000n;
 const marketContractAddress = '5CYN9j3YvRkqxewoxeSvRbhAym4465C57uMmX5j4yz99L5H6';
 
 describe('Contracts', () => {
@@ -53,8 +59,10 @@
       expect(newContractInstance.address.toString()).to.equal(marketContractAddress);
     });
   });
+});
 
-  it('Can transfer NFT using smart contract.', async () => {
+describe.only('Chain extensions', () => {
+  it('Transfer CE', async () => {
     await usingApi(async api => {
       const alice = privateKey("//Alice");
       const bob = privateKey("//Bob");
@@ -63,6 +71,9 @@
       const collectionId = await createCollectionExpectSuccess();
       const tokenId = await createItemExpectSuccess(alice, collectionId, 'NFT');
       const [contract, deployer] = await deployTransferContract(api);
+      const changeAdminTx = api.tx.nft.addCollectionAdmin(collectionId, contract.address);
+      await submitTransactionAsync(alice, changeAdminTx);
+
       const tokenBefore: any = (await api.query.nft.nftItemList(collectionId, tokenId) as any).unwrap();
       
       // Transfer
@@ -77,4 +88,165 @@
       expect(tokenAfter.Owner.toString()).to.be.equal(bob.address);
     });
   });
+
+  it('Mint CE', async () => {
+    await usingApi(async api => {
+      const alice = privateKey('//Alice');
+      const bob = privateKey('//Bob');
+
+      const collectionId = await createCollectionExpectSuccess();
+      const [contract, deployer] = await deployTransferContract(api);
+      await enablePublicMintingExpectSuccess(alice, collectionId);
+      await enableWhiteListExpectSuccess(alice, collectionId);
+      await addToWhiteListExpectSuccess(alice, collectionId, contract.address);
+      await addToWhiteListExpectSuccess(alice, collectionId, bob.address);
+
+      const transferTx = contract.tx.createItem(value, gasLimit, bob.address, collectionId, { Nft: {const_data: '0x010203', variable_data: '0x020304' }});
+      const events = await submitTransactionAsync(alice, transferTx);
+      const result = getGenericResult(events);
+      expect(result.success).to.be.true;
+
+      const tokensAfter: any = (await api.query.nft.nftItemList.entries(collectionId) as any).map((kv: any) => kv[1].toJSON());
+      expect(tokensAfter).to.be.deep.equal([
+        {
+          Owner: bob.address,
+          ConstData: '0x010203',
+          VariableData: '0x020304',
+        },
+      ]);
+    });
+  });
+
+  it('Bulk mint CE', async () => {
+    await usingApi(async api => {
+      const alice = privateKey('//Alice');
+      const bob = privateKey('//Bob');
+
+      const collectionId = await createCollectionExpectSuccess();
+      const [contract, deployer] = await deployTransferContract(api);
+      await enablePublicMintingExpectSuccess(alice, collectionId);
+      await enableWhiteListExpectSuccess(alice, collectionId);
+      await addToWhiteListExpectSuccess(alice, collectionId, contract.address);
+      await addToWhiteListExpectSuccess(alice, collectionId, bob.address);
+
+      const transferTx = contract.tx.createMultipleItems(value, gasLimit, bob.address, collectionId, [
+        { Nft: { const_data: '0x010203', variable_data: '0x020304' } },
+        { Nft: { const_data: '0x010204', variable_data: '0x020305' } },
+        { Nft: { const_data: '0x010205', variable_data: '0x020306' } }
+      ]);
+      const events = await submitTransactionAsync(alice, transferTx);
+      const result = getGenericResult(events);
+      expect(result.success).to.be.true;
+
+      const tokensAfter: any = (await api.query.nft.nftItemList.entries(collectionId) as any)
+        .map((kv: any) => kv[1].toJSON())
+        .sort((a: any, b: any) => a.ConstData.localeCompare(b.ConstData));
+      expect(tokensAfter).to.be.deep.equal([
+        {
+          Owner: bob.address,
+          ConstData: '0x010203',
+          VariableData: '0x020304',
+        },
+        {
+          Owner: bob.address,
+          ConstData: '0x010204',
+          VariableData: '0x020305',
+        },
+        {
+          Owner: bob.address,
+          ConstData: '0x010205',
+          VariableData: '0x020306',
+        },
+      ]);
+    });
+  });
+
+  it('Approve CE', async () => {
+    await usingApi(async api => {
+      const alice = privateKey('//Alice');
+      const bob = privateKey('//Bob');
+      const charlie = privateKey('//Charlie');
+
+      const collectionId = await createCollectionExpectSuccess();
+      const [contract, deployer] = await deployTransferContract(api);
+      const tokenId = await createItemExpectSuccess(alice, collectionId, 'NFT', contract.address);
+
+      const transferTx = contract.tx.approve(value, gasLimit, bob.address, collectionId, tokenId, 1);
+      const events = await submitTransactionAsync(alice, transferTx);
+      const result = getGenericResult(events);
+      expect(result.success).to.be.true;
+
+      await transferFromExpectSuccess(collectionId, tokenId, bob, contract.address.toString(), charlie, 1, 'NFT');
+    });
+  });
+
+  it('TransferFrom CE', async () => {
+    await usingApi(async api => {
+      const alice = privateKey('//Alice');
+      const bob = privateKey('//Bob');
+      const charlie = privateKey('//Charlie');
+
+      const collectionId = await createCollectionExpectSuccess();
+      const [contract, deployer] = await deployTransferContract(api);
+      const tokenId = await createItemExpectSuccess(alice, collectionId, 'NFT', bob.address);
+      await approveExpectSuccess(collectionId, tokenId, bob, contract.address.toString(), 1);
+
+      const transferTx = contract.tx.transferFrom(value, gasLimit, bob.address, charlie.address, collectionId, tokenId, 1);
+      const events = await submitTransactionAsync(alice, transferTx);
+      const result = getGenericResult(events);
+      expect(result.success).to.be.true;
+
+      const token: any = (await api.query.nft.nftItemList(collectionId, tokenId) as any).unwrap()
+      expect(token.Owner.toString()).to.be.equal(charlie.address);
+    });
+  });
+
+  it('SetVariableMetaData CE', async () => {
+    await usingApi(async api => {
+      const alice = privateKey('//Alice');
+
+      const collectionId = await createCollectionExpectSuccess();
+      const [contract, deployer] = await deployTransferContract(api);
+      const tokenId = await createItemExpectSuccess(alice, collectionId, 'NFT', contract.address);
+
+      const transferTx = contract.tx.setVariableMetaData(value, gasLimit, collectionId, tokenId, '0x121314');
+      const events = await submitTransactionAsync(alice, transferTx);
+      const result = getGenericResult(events);
+      expect(result.success).to.be.true;
+
+      const token: any = (await api.query.nft.nftItemList(collectionId, tokenId) as any).unwrap()
+      expect(token.VariableData.toString()).to.be.equal('0x121314');
+    });
+  });
+
+  it('ToggleWhiteList CE', async () => {
+    await usingApi(async api => {
+      const alice = privateKey('//Alice');
+      const bob = privateKey('//Bob');
+
+      const collectionId = await createCollectionExpectSuccess();
+      const [contract, deployer] = await deployTransferContract(api);
+      const changeAdminTx = api.tx.nft.addCollectionAdmin(collectionId, contract.address);
+      await submitTransactionAsync(alice, changeAdminTx);      
+
+      expect(await isWhitelisted(collectionId, bob.address)).to.be.false;
+
+      {
+        const transferTx = contract.tx.toggleWhiteList(value, gasLimit, collectionId, bob.address, true);
+        const events = await submitTransactionAsync(alice, transferTx);
+        const result = getGenericResult(events);
+        expect(result.success).to.be.true;
+
+        expect(await isWhitelisted(collectionId, bob.address)).to.be.true;
+      }
+      {
+        const transferTx = contract.tx.toggleWhiteList(value, gasLimit, collectionId, bob.address, false);
+        const events = await submitTransactionAsync(alice, transferTx);
+        const result = getGenericResult(events);
+        expect(result.success).to.be.true;
+
+        expect(await isWhitelisted(collectionId, bob.address)).to.be.false;
+      }
+    });
+  });
 });