--- a/tests/src/collision-tests/adminLimitsOff.test.ts
+++ b/tests/src/collision-tests/adminLimitsOff.test.ts
@@ -53,8 +53,7 @@
       ]);
       await timeoutPromise(10000);
       const changeAdminTx4 = api.tx.nft.addCollectionAdmin(collectionId, Alice.address);
-      // tslint:disable-next-line: no-unused-expression
-      expect(submitTransactionExpectFailAsync(Alice, changeAdminTx4)).to.be.rejected;
+      await expect(submitTransactionExpectFailAsync(Alice, changeAdminTx4)).to.be.rejected;
 
       const adminListAfterAddAdmin: any = (await api.query.nft.adminList(collectionId));
       expect(adminListAfterAddAdmin).to.be.contains(Eve.address);
--- a/tests/src/createCollection.test.ts
+++ b/tests/src/createCollection.test.ts
@@ -40,8 +40,7 @@
       const badTransaction = async () => {
         await createCollectionExpectSuccess({mode: {type: 'Invalid'}});
       };
-      // tslint:disable-next-line:no-unused-expression
-      expect(badTransaction()).to.be.rejected;
+      await expect(badTransaction()).to.be.rejected;
 
       const BcollectionCount = parseInt((await api.query.nft.createdCollectionCount()).toString(), 10);
       expect(BcollectionCount).to.be.equal(AcollectionCount, 'Error: Incorrect collection created.');