Vue单元测试

Vue单元测试

1. 新建一个vue项目

# 1.创建项目
vue create vue-jest-demo # 新建一个vue的项目（选择jest单元测试）

# 2.选择自定义配置
  default (babel, eslint)
> Manually select features

# 3.选择安装feature，也可以根据自己的喜好去安装
 (*) Babel
 ( ) TypeScript
 ( ) Progressive Web App (PWA) Support
 (*) Router
 (*) Vuex
 (*) CSS Pre-processors
 (*) Linter / Formatter
>(*) Unit Testing
 ( ) E2E Testing

 # 选择测试框架，我们选择jest
   Mocha + Chai
>(*) Jest
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安装完毕后，会在根目录下存在一个 tests 的目录，其中里面包含一个简单的测试用例 example.spec.js 文件 和 jest.config.js 单元测试配置文件

2. 项目目录结构

LiuJun-MacBook-Pro:vue-test-demo liujun$ tree
.
├── README.md
├── babel.config.js
├── jest.config.js # 单元测试的配置
├── package-lock.json
├── package.json # 项目的依赖
├── public
│   ├── favicon.ico
│   └── index.html
├── src
│   ├── App.vue
│   ├── assets
│   │   └── logo.png
│   ├── components
│   │   └── HelloWorld.vue
│   ├── main.js
│   ├── router
│   │   └── index.js
│   ├── store
│   │   └── index.js
│   └── views
│       ├── About.vue
│       └── Home.vue
└── tests # 单元测试的文件
    └── unit
        └── example.spec.js
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项目的package.json文件

{
   
  "name": "vue-test-demo",
  "version": "0.1.0",
  "private": true,
  "scripts": {
   
    "serve": "vue-cli-service serve",
    "build": "vue-cli-service build",
    "test:unit": "vue-cli-service test:unit",
    "lint": "vue-cli-service lint"
  },
  "dependencies": {
   
    "core-js": "^3.6.5",
    "vue": "^2.6.11",
    "vue-router": "^3.2.0",
    "vuex": "^3.4.0"
  },
  "devDependencies": {
   
    "@vue/cli-plugin-babel": "~4.5.0",
    "@vue/cli-plugin-router": "~4.5.0",
    "@vue/cli-plugin-vuex": "~4.5.0",
    "@vue/cli-service": "~4.5.0",


    "@vue/cli-plugin-unit-jest": "~4.5.0",
    "@vue/test-utils": "^1.0.3",

    "@vue/eslint-config-standard": "^5.1.2",
    "@vue/cli-plugin-eslint": "~4.5.0",
    "babel-eslint": "^10.1.0",
    "eslint": "^6.7.2",
    "eslint-plugin-import": "^2.20.2",
    "eslint-plugin-node": "^11.1.0",
    "eslint-plugin-promise": "^4.2.1",
    "eslint-plugin-standard": "^4.0.0",
    "eslint-plugin-vue": "^6.2.2",
    "node-sass": "^4.12.0",
    "sass-loader": "^8.0.2",
    "vue-template-compiler": "^2.6.11"
  }
}

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项目 jest.config.json 文件的配置

module.exports = {
   
  preset: '@vue/cli-plugin-unit-jest'
}

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2. 运行单元测试

npm run test:unit

# 控制台输出的结果

LiuJun-MacBook-Pro:vue-test-demo liujun$ npm run test:unit

> vue-test-demo@0.1.0 test:unit /Users/liujun/Documents/huayun/test/vue-test-demo
> vue-cli-service test:unit

 PASS  tests/unit/example.spec.js
  HelloWorld.vue
    ✓ renders props.msg when passed (40ms)

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        5.595s
Ran all test suites.

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3. 配置测试覆盖率和测试报告
   在根目录下的 jest.config.js 中，进行如下配置：

module.exports = {
   
  preset: '@vue/cli-plugin-unit-jest',
  moduleNameMapper: {
   
    "^@/(.*)$": "<rootDir>/src/$1"
  },
  testMatch: [
    "**/tests/unit/**/*.spec.(js|jsx|ts|tsx)|**/__tests__/*.(js|jsx|ts|tsx)"
  ],
  collectCoverage: true,
  coverageDirectory: "<rootDir>/tests/unit/coverage",
  collectCoverageFrom: [
    "src/components/**/*.vue",
    "src/utils/**/*.ts",
    "src/store/modules/*.ts",
    "!src/utils/axios.ts",
    "!src/utils/notify.ts"
  ]
}
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配置的解释如下：

1. preset: 预设的vue单元测试使用的插件。

2. moduleNameMapper：模块别名配置。

3. testMatch：测试文件查找规则，可以是统一放在src/tests目录下，也可以就近放在_ _tests__目录下。

4. collectCoverage：是否进行测试覆盖率收集。

5. coverageDirectory：测试报告存放位置。

6. collectCoverageFrom：测试哪些文件和不测试哪些文件，你可以根据你的团队或者个人偏好进行设置。

在完善以上配置后，在终端运行npm run test:unit命令，可看测试覆盖率和测试报告。

> vue-cli-service test:unit

 PASS  tests/unit/example.spec.js
  HelloWorld.vue
    ✓ renders props.msg when passed (36ms)

----------|----------|----------|----------|----------|-------------------|
File      |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
----------|----------|----------|----------|----------|-------------------|
All files |        0 |        0 |        0 |        0 |                   |
----------|----------|----------|----------|----------|-------------------|
Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        5.17s
Ran all test suites.
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测试HelloWorld组件

1.简单测试HelloWorld组件

1.编写 HelloWorld.vue组件

<template>
  <div class="hello">
    <slot name="title">
      <span>count:{
  {count}}</span>
    </slot>
    <button
      class="btn btn-primary"
      :style="{height:'50px'}"
      @click="handlerBtnClick">
      {
  {msg}}
    </button>
  </div>
</template>
<script>
export default {
     
  name: 'HelloWorld',
  props: {
     
    msg: String,
    defaultCount: {
     
      type: Number,
      default: 0
    }
  },
  data () {
     
    return {
     
      count: this.defaultCount
    }
  },
  methods: {
     
    handlerBtnClick () {
     
      this.count = this.count + 1
    }
  }
}
</script>
<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped lang
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