--- a/tests/src/util/helpers.ts
+++ b/tests/src/util/helpers.ts
@@ -606,11 +606,11 @@
   });
 }
 
-export async function enablePublicMintingExpectSuccess(sender: IKeyringPair, collectionId: number) {
+export async function setMintPermissionExpectSuccess(sender: IKeyringPair, collectionId: number, enabled: boolean) {
   await usingApi(async (api) => {
 
     // Run the transaction
-    const tx = api.tx.nft.setMintPermission(collectionId, true);
+    const tx = api.tx.nft.setMintPermission(collectionId, enabled);
     const events = await submitTransactionAsync(sender, tx);
     const result = getGenericResult(events);
 
@@ -618,8 +618,24 @@
     const collection: any = (await api.query.nft.collection(collectionId)).toJSON();
 
     // What to expect
+    // tslint:disable-next-line:no-unused-expression
     expect(result.success).to.be.true;
-    expect(collection.MintMode).to.be.equal(true);
+    expect(collection.MintMode).to.be.equal(enabled);
+  });
+}
+
+export async function enablePublicMintingExpectSuccess(sender: IKeyringPair, collectionId: number) {
+  await setMintPermissionExpectSuccess(sender, collectionId, true);
+}
+
+export async function setMintPermissionExpectFailure(sender: IKeyringPair, collectionId: number, enabled: boolean) {
+  await usingApi(async (api) => {
+    // Run the transaction
+    const tx = api.tx.nft.setMintPermission(collectionId, enabled);
+    const events = await expect(submitTransactionExpectFailAsync(sender, tx)).to.be.rejected;
+    const result = getCreateCollectionResult(events);
+    // tslint:disable-next-line:no-unused-expression
+    expect(result.success).to.be.false;
   });
 }