--- /dev/null
+++ b/tests/src/createCollection.test.ts
@@ -0,0 +1,90 @@
+import { assert } from 'chai';
+import privateKey from './substrate/privateKey';
+import usingApi from './substrate/substrate-api';
+import waitNewBlocks from './substrate/wait-new-blocks';
+
+describe('integration test: ext. createCollection():', () => {
+  it('Create new NFT collection', async () => {
+    await usingApi(async (api) => {
+      const alicePrivateKey = privateKey('//Alice');
+      const AcollectionCount = await api.query.nft.collectionCount();
+      await api.tx.nft
+            .createCollection('1', '1', '1', 'NFT')
+            .signAndSend(alicePrivateKey);
+      await waitNewBlocks(api);
+      const BcollectionCount = await api.query.nft.collectionCount();
+      if (BcollectionCount === AcollectionCount) {assert.fail('Error: NFT collection NOT created.'); }
+    });
+  });
+  it('Create new Fungible collection', async () => {
+    await usingApi(async (api) => {
+      const alicePrivateKey = privateKey('//Alice');
+      const AcollectionCount = await api.query.nft.collectionCount();
+      await api.tx.nft
+            .createCollection('1', '1', '1', 'Fungible')
+            .signAndSend(alicePrivateKey);
+      await waitNewBlocks(api);
+      const BcollectionCount = await api.query.nft.collectionCount();
+      if (BcollectionCount === AcollectionCount) {assert.fail('Error: Fungible collection NOT created.'); }    });
+  });
+  it('Create new ReFungible collection', async () => {
+    await usingApi(async (api) => {
+      const alicePrivateKey = privateKey('//Alice');
+      const AcollectionCount = await api.query.nft.collectionCount();
+      await api.tx.nft
+            .createCollection('1', '1', '1', 'ReFungible')
+            .signAndSend(alicePrivateKey);
+      await waitNewBlocks(api);
+      const BcollectionCount = await api.query.nft.collectionCount();
+      if (BcollectionCount === AcollectionCount) {assert.fail('Error: ReFungible collection NOT created.'); }    });
+  });
+});
+
+describe('(!negative test!) integration test: ext. createCollection():', () => {
+  it('(!negative test!) create new NFT collection whith incorrect data (mode)', async () => {
+    await usingApi(async (api) => {
+      const alicePrivateKey = privateKey('//Alice');
+      const AcollectionCount = await api.query.nft.collectionCount();
+      await api.tx.nft
+            .createCollection('1', '1', '1', 'BadMode')
+            .signAndSend(alicePrivateKey);
+      await waitNewBlocks(api);
+      const BcollectionCount = await api.query.nft.collectionCount();
+      if (BcollectionCount > AcollectionCount) {assert.fail('Error: Incorrect collection created.'); }
+    });
+  });
+  it('(!negative test!) create new NFT collection whith incorrect data (token_prefix)', async () => {
+    await usingApi(async (api) => {
+      const alicePrivateKey = privateKey('//Alice');
+      const AcollectionCount = await api.query.nft.collectionCount();
+      await api.tx.nft
+            .createCollection('1', '1', '0x999', 'NFT')
+            .signAndSend(alicePrivateKey);
+      await waitNewBlocks(api);
+      const BcollectionCount = await api.query.nft.collectionCount();
+      if (BcollectionCount > AcollectionCount) {assert.fail('Incorrect data (token_prefix) created.'); }
+    });
+  });
+  it('(!negative test!) create new NFT collection whith incorrect data (collection_name)', async () => {
+    await usingApi(async (api) => {
+      const alicePrivateKey = privateKey('//Alice');
+      const AcollectionCount = await api.query.nft.collectionCount();
+      await api.tx.nft
+            .createCollection('BadName', '1', '1', 'NFT')
+            .signAndSend(alicePrivateKey);
+      await waitNewBlocks(api);
+      const BcollectionCount = await api.query.nft.collectionCount();
+      if (BcollectionCount > AcollectionCount) {assert.fail('Incorrect data (collection_name) created.'); }    });
+  });
+  it('(!negative test!) create new NFT collection whith incorrect data (collection_description)', async () => {
+    await usingApi(async (api) => {
+      const alicePrivateKey = privateKey('//Alice');
+      const AcollectionCount = await api.query.nft.collectionCount();
+      await api.tx.nft
+            .createCollection('1', 'BadDesk', '1', 'NFT')
+            .signAndSend(alicePrivateKey);
+      await waitNewBlocks(api);
+      const BcollectionCount = await api.query.nft.collectionCount();
+      if (BcollectionCount > AcollectionCount) {assert.fail('Incorrect data (collection_desc) created.'); }    });
+  });
+});