dapp开发之hardhat框架实践（基础篇）

前提：安装node 版本>12，npm, git等
1.创建文件夹，创建之后用自己熟悉的工具打开，例如：webstorm
2.打开之后运行“npm init -y” ，会在控制台打印：

{
“name”: “76-learn-hardhat”,
“version”: “1.0.0”,
“description”: “”,
“main”: “index.js”,
“scripts”: {
“test”: “echo “Error: no test specified” && exit 1”
},
“keywords”: [],
“author”: “”,
“license”: “ISC”
}

3.运行npm install --save-dev hardhat，成功之后如下：

注意：报错解决办法：npm install --save-dev “@nomiclabs/hardhat-ethers@^2.0.0” “ethereum-waffle@^3.2.0” “ethers@^5.0.0”

4.这样就成功创建了hardhat项目，接下来我们可以用npx（npm子命令）运行测试 npx hardhat，d出下图证明成功
5.期间提示你安装一些插件，进行安装

6.可用命令npx hardhat --help7.编译合约用npx hardhat compile
8.接下来进行重新编写个小的代币合约

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;

import "hardhat/console.sol";

contract Token {
    string public name='my token';
    string public symbol = 'Mtn';
    uint256 public total = 100000;
    address public owner;
    mapping(address =>uint) balances;
    constructor() {
        owner = msg.sender;
        balances[msg.sender] =total;
    }

    function tranfer(address to,uint amount) external{
        balances[msg.sender] -=amount;
        balances[to] +=amount;
    }

    function getamount(address account) view external returns(uint a){
        a = balances[account];
    }
}

9.编译后进行编写测试脚本：

const { expect } = require("chai");
const { ethers } = require("hardhat");

describe("Token", function () {
  let Token, token, owner,address
  beforeEach(async ()=>{
    Token = await  ethers.getContractFactory('Token');
    token = await  Token.deploy();//部署
    [owner,address,] = await  ethers.getSigners();
  })

  describe('test',()=>{
    it('所有者', async ()=> {
        expect(await token.owner()).to.equal(owner.address);
    })

  })
});

10.运行命令进行测试：npx hardhat test

注意：第一次运行可能报以下错误：Error: Cannot find module ‘chai’ 解决办法：npm install
–save-dev chai

运行测试成功如下图：