单元测试

• 安装mocha

npm init -y
npm i -D mocha  

• 根目录创建add.js

function add(a, b) {
    return a + b
}

module.exports = add;

• 创建test目录创建add.test.js

const  add = require('../add');
const assert = require('assert');

describe('add', () => {
    describe('add()', () => {
        it('3+4 等于 7', () => {
            assert.equal(add(3, 4), 7);
        });
    });
});

• node不支持import export 语法, 将node升级至v14.7.0

nvm ls  #查看当前node版本
nvm install 14.7.0 #安装nodev.14.7.0
nvm use 14.7.0

• 更改add.js

export const add = (a, b) => {
    return a + b
}

• 更改add.test.js

import {
    add
} from "../add.js"
import assert from 'assert';

describe('add', () => {
    describe('add()', () => {
        it('3+4 等于 7', () => {
            assert.equal(add(3, 4), 7);
        });
    });
});

• package.json

{
  "name": "test-demo",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "mocha"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "mocha": "^8.1.1"
  },
  "type": "module"  //加入此关键
}

• npm test 成功

  
  
  image.png

• 安装nyc

npm i nyc 

• package.json

{
  "name": "test-demo",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "mocha",
    "coverage": "nyc mocha"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "mocha": "^8.1.1"
  },
  "type": "module",
  "dependencies": {
    "nyc": "^15.1.0"
  }
}

• 创建.nycrc

{
 
    "all": true,
    "include": [
      "src/*.mjs"
    ],
    "exclude": [
      "**/*.spec.js"
    ],
    "nyc": {
    "extension": [
      ".jsx",
      ".mjs"
    ]
  }
}

• 创建src， 将add.js移入

• npm run coverage

  
  
  image.png

• 将js文件改为mjs后缀

• npm run coverage

  
  
  image.png

• 把mocha改为ava

npm i -D ava

• add.text.mjs

import {
    add
} from "../src/add.mjs"
import test from 'ava';

// describe('add', () => {
//     it('3+4 等于 7', () => {
//         assert.equal(add(3, 4), 7);
//     });
// });


test('add', t => {
    if (add(3, 4) === 7) {
        t.pass();
    }

});

• package.json

{
  "name": "test-demo",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "ava",
    "coverage": "nyc ava"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@babel/core": "^7.11.4",
    "@babel/preset-env": "^7.11.0",
    "ava": "^3.11.1",
    "babel-loader": "^8.1.0",
    "mocha": "^8.1.1"
  },
  "type": "module",
  "dependencies": {
    "nyc": "^15.1.0",
    "webpack": "^4.44.1"
  }
}

• npm run coverage

  
  
  image.png