Merge pull request #2727 from ethereum-optimism/fix/broken-contracts-tests

contracts: fix broken contracts tests

packages/contracts/test/helpers/test-runner/json-test-runner.ts

 /* External Imports */
 import { ethers } from 'hardhat'
-import { Contract, BigNumber } from 'ethers'
+import { Contract } from 'ethers'
 
 import { expect } from '../../setup'
 
 const bigNumberify = (arr: any[]) => {
   return arr.map((el: any) => {
     if (typeof el === 'number') {
-      return BigNumber.from(el)
+      return ethers.BigNumber.from(el)
     } else if (typeof el === 'string' && /^\d+n$/gm.test(el)) {
-      return BigNumber.from(el.slice(0, el.length - 1))
+      return ethers.BigNumber.from(el.slice(0, el.length - 1))
     } else if (typeof el === 'string' && el.length > 2 && el.startsWith('0x')) {
-      return BigNumber.from(el.toLowerCase())
+      return ethers.BigNumber.from(el.toLowerCase())
     } else if (Array.isArray(el)) {
       return bigNumberify(el)
     } else {
@@ -34,9 +34,10 @@ export const runJsonTest = (contractName: string, json: any): void => {
             await expect(contract.functions[functionName](...test.in)).to.be
               .reverted
           } else {
-            expect(
-              bigNumberify(await contract.functions[functionName](...test.in))
-            ).to.deep.equal(bigNumberify(test.out))
+            const result = await contract.functions[functionName](...test.in)
+            expect(JSON.stringify(bigNumberify(result))).to.deep.equal(
+              JSON.stringify(bigNumberify(test.out))
+            )
           }
         })
       }