diff --git a/__tests__/account.test.ts b/__tests__/account.test.ts
index d46cfed45..fe54ae44d 100644
--- a/__tests__/account.test.ts
+++ b/__tests__/account.test.ts
@@ -1,3 +1,5 @@
+import { isBN } from 'bn.js';
+
 import typedDataExample from '../__mocks__/typedDataExample.json';
 import { Account, Contract, defaultProvider, ec, number, stark } from '../src';
 import { toBN } from '../src/utils/number';
@@ -50,7 +52,7 @@ describe('deploy and test Wallet', () => {
       entrypoint: 'transfer',
       calldata: [erc20.address, '10'],
     });
-    expect(typeof amount).toBe('number');
+    expect(isBN(amount)).toBe(true);
     expect(typeof unit).toBe('string');
   });
 
diff --git a/__tests__/provider.test.ts b/__tests__/provider.test.ts
index aed5f4ede..735f6b3a9 100644
--- a/__tests__/provider.test.ts
+++ b/__tests__/provider.test.ts
@@ -76,9 +76,9 @@ describe('defaultProvider', () => {
 
     test('getTransactionReceipt', async () => {
       return expect(
-        defaultProvider.getTransactionReceipt({
-          txHash: '0x37013e1cb9c133e6fe51b4b371b76b317a480f56d80576730754c1662582348',
-        })
+        defaultProvider.getTransactionReceipt(
+          '0x37013e1cb9c133e6fe51b4b371b76b317a480f56d80576730754c1662582348'
+        )
       ).resolves.not.toThrow();
     });