使用 @nomiclabs/hardhat-waffle 实现夹具

Posted 2023-02-16

【中文标题】使用 @nomiclabs/hardhat-waffle 实现夹具

【英文标题】：Implementing fixtures with @nomiclabs/hardhat-waffle

【发布时间】：2021-09-11 21:38:46

【问题描述】：

在官方 waffle 文档中，您可能会找到实现固定装置的下一种方法：

import expect from 'chai';
import loadFixture, deployContract from 'ethereum-waffle';
import BasicTokenMock from './build/BasicTokenMock';

describe('Fixtures', () => 
  async function fixture([wallet, other], provider) 
    const token = await deployContract(wallet, BasicTokenMock, [
      wallet.address, 1000
    ]);
    return token, wallet, other;
  

  it('Assigns initial balance', async () => 
    const token, wallet = await loadFixture(fixture);
    expect(await token.balanceOf(wallet.address)).to.equal(1000);
  );

  it('Transfer adds amount to destination account', async () => 
    const token, other = await loadFixture(fixture);
    await token.transfer(other.address, 7);
    expect(await token.balanceOf(other.address)).to.equal(7);
  );
);

但是，在安全帽上使用该插件时，这将不起作用。插件文档中没有给出官方说明。

在下面回答。

【参考方案1】：

虽然您可以通过“Alt + 单击”每个变量自行找到解决方案，直到找到正确的类型结构，但最好使用这个 sn-p：

以下适用于 Typescript，如果你想在 javascript 上使用它，只需切换到使用“require()”导入以及摆脱类型：

    import Wallet, Contract from "ethers";
    import MockProvider from "ethereum-waffle";
    import ethers, waffle from "hardhat";
    const loadFixture, deployContract = waffle;


//Contract ABI
// For typescript only!
// In order to be able to import .json files make sure you tsconfig.json has set "compilerOptions" > "resolveJsonModule": true. My tsconfig.json at the bottom!
//For obvious reasons change this to the path of your compiled ABI

  import * as TodoListABI from "../artifacts/contracts/TodoList.sol/TodoList.json";

    //Fixtures
  async function fixture(_wallets: Wallet[], _mockProvider: MockProvider) 
    const signers = await ethers.getSigners();
    let token: Contract = await deployContract(signers[0], TodoListABI);
    return token;
  

然后，在你的 mocha-chai 测试中

it("My unit test", async function () 
    const token = await loadFixture(fixture);
    // Your code....
  );

我的 tsconfig.json 用于这个安全帽项目

  "compilerOptions": 
    "target": "es2018",
    "module": "commonjs",
    "strict": true,
    "esModuleInterop": true,
    "outDir": "dist",
    "resolveJsonModule": true
  ,
  "include": ["./scripts", "./test"],
  "files": ["./hardhat.config.ts"]