Solidity：使用 waffle + chai 测试恢复的断言不起作用

Posted 2023-02-18

【中文标题】Solidity：使用 waffle + chai 测试恢复的断言不起作用

【英文标题】：Solidity: Testing reverted assertions with waffle + chai doesn't work

【发布时间】：2021-12-14 20:28:51

【问题描述】：

我正在测试一个 ERC721 代币的智能合约，它继承自 OpenZeppelin，使用 waffle 和 chai 和 NodeJS v14.18.0，但 chai 的还原断言似乎没有按预期运行。

依赖关系：

  "devDependencies": 
    "@nomiclabs/hardhat-ethers": "^2.0.1",
    "@nomiclabs/hardhat-etherscan": "^2.1.0",
    "@nomiclabs/hardhat-waffle": "^2.0.1",
    "@typechain/ethers-v5": "^5.0.0",
    "@types/chai": "^4.2.14",
    "@types/mocha": "^8.2.0",
    "@types/node": "^14.14.14",
    "chai": "^4.2.0",
    "dotenv": "^8.2.0",
    "ethereum-waffle": "^3.2.1",
    "ethers": "^5.0.24",
    "hardhat": "^2.0.5",
    "hardhat-typechain": "^0.3.4",
    "ts-generator": "^0.1.1",
    "ts-node": "^9.1.1",
    "typechain": "^4.0.1",
    "typescript": "^4.1.3"
  ,

示例代码：

  let genesisTokenHolders: Array<string>;

        beforeEach(async () => 
            genesisTokenHolders = new Array(230).fill('0x0000000000000000000000000000000000000000')
            genesisTokenHolders[1] = addr1.address;
            genesisTokenHolders[2] = addr2.address;
        )

        describe('airdrop genesis tokens', async () => 
            it('should fail when non-owner calls the function', async () => 
                
                let addGenesisHoldersTx = await myToken.addGenesisTokenHolderAddresses(genesisTokenHolders)
                await addGenesisHoldersTx.wait();
                    
                await expect(await myToken.connect(addr1).airdropTokensToGenesisHolders(1, 2)).to.be.revertedWith("Ownable: caller is not the owner");
            )
        
            it('should succeed when called by the owner', async () => 

                let addGenesisHoldersTx = await myToken.addGenesisTokenHolderAddresses(genesisTokenHolders)
                await addGenesisHoldersTx.wait();
 
                let airdropTx = await myToken.connect(deployer).airdropTokensToGenesisHolders(1,2);
                await airdropTx.wait();
            
                // addr1 should own tokenID 1, addr2 should own tokenId 2
                await expect(await myToken.ownerOf(1)).to.hexEqual(addr1.address)
                await expect(await myToken.ownerOf(2)).to.hexEqual(addr2.address)
                
                await expect(await myToken.ownerOf(1000)).to.be.reverted;
            )
        );

尽管使用了.to.be.revertedWith() 和.to.be.reverted，测试套件仍然抛出错误：

         airdrop genesis tokens
           should fail when non-owner calls the function:
     Error: VM Exception while processing transaction: revert Ownable: caller is not the owner

         airdrop genesis tokens
           should succeed when called by the owner:
     Error: VM Exception while processing transaction: revert ERC721: owner query for nonexistent token

预期结果：测试应该通过。

【参考方案1】：

不要等待承诺在 expect 内得到解决

更改自：

await expect(await myToken.ownerOf(1000)).to.be.reverted;

收件人：

await expect(myToken.ownerOf(1000)).to.be.reverted;