使用 @nomiclabs/hardhat-waffle 实现装置

Question

在官方华夫饼文档中，您可能会找到实现装置的下一种方法：

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。插件文档没有给出官方说明。

回答如下。

Answer 1

尽管您可以通过在每个变量上“Alt + 单击”来找到自己的解决方案，直到得出正确的类型结构，但最好使用以下代码片段：

以下适用于 Typescript，如果您想在 javascript 上使用它，只需切换到使用“require()”导入并删除类型：

    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，在你的摩卡茶测试中

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

我的这个安全帽项目的 tsconfig.json

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