--- a/tests/src/util/helpers.ts
+++ b/tests/src/util/helpers.ts
@@ -488,6 +488,26 @@
   });
 }
 
+export async function setVariableMetaDataSponsoringRateLimitExpectSuccess(sender: IKeyringPair, collectionId: number, rateLimit: number) {
+  await usingApi(async (api) => {
+    const tx = api.tx.nft.setVariableMetaDataSponsoringRateLimit(collectionId, rateLimit);
+    const events = await submitTransactionAsync(sender, tx);
+    const result = getGenericResult(events);
+
+    expect(result.success).to.be.true;
+  });
+}
+
+export async function setVariableMetaDataSponsoringRateLimitExpectFailure(sender: IKeyringPair, collectionId: number, rateLimit: number) {
+  await usingApi(async (api) => {
+    const tx = api.tx.nft.setVariableMetaDataSponsoringRateLimit(collectionId, rateLimit);
+    const events = await expect(submitTransactionExpectFailAsync(sender, tx)).to.be.rejected;
+    const result = getGenericResult(events);
+
+    expect(result.success).to.be.false;
+  });
+}
+
 export async function setOffchainSchemaExpectSuccess(sender: IKeyringPair, collectionId: number, data: number[]) {
   await usingApi(async (api) => {
     const tx = api.tx.nft.setOffchainSchema(collectionId, '0x' + Buffer.from(data).toString('hex'));