vue如何添加jest测试
作者:鶸者为何战斗
vue添加jest测试
用vuecli搭建了vue框架,想弄个单元测试,但是不是SecurityError: localStorage is not available for opaque origins,就是找不到包。
这里分为两种情况解决。
第一、如果是终端敲npm run unit,那么需要修改jest.conf.js文件添加一行testURL
const path = require('path')
module.exports = {
rootDir: path.resolve(__dirname, '../../'),
moduleFileExtensions: [
'js',
'json',
'vue'
],
moduleNameMapper: {
'^@/(.*)$': '<rootDir>/src/$1'
},
transform: {
'^.+\\.js$': '<rootDir>/node_modules/babel-jest',
'.*\\.(vue)$': '<rootDir>/node_modules/vue-jest'
},
testPathIgnorePatterns: [
'<rootDir>/test/e2e'
],
snapshotSerializers: ['<rootDir>/node_modules/jest-serializer-vue'],
setupFiles: ['<rootDir>/test/unit/setup'],
mapCoverage: true,
coverageDirectory: '<rootDir>/test/unit/coverage',
collectCoverageFrom: [
'src/**/*.{js,vue}',
'!src/main.js',
'!src/router/index.js',
'!**/node_modules/**'
],
'testURL': 'http://localhost'
}第二、如果想在webstorm里面直接点击*.test.js或者*.spec.js两种文件运行
那么你需要修改package.json里面的
{
"name": "frontlearn",
"version": "1.0.0",
"description": "A Vue.js project",
"author": "ruvikvan",
"private": true,
"scripts": {
"dev": "webpack-dev-server --inline --progress --config build/webpack.dev.conf.js",
"start": "npm run dev",
"unit": "jest --config test/unit/jest.conf.js --coverage",
"e2e": "node test/e2e/runner.js",
"test": "npm run unit && npm run e2e",
"lint": "eslint --ext .js,.vue src test/unit test/e2e/specs",
"build": "node build/build.js"
},
"dependencies": {
"axios": "^0.18.0",
"better-scroll": "^1.15.1",
"vue": "^2.5.2",
"vue-router": "^3.0.1",
"vue-test-utils": "^1.0.0-beta.11"
},
"devDependencies": {
"autoprefixer": "^7.1.2",
"babel-core": "^6.22.1",
"babel-eslint": "^8.2.1",
"babel-helper-vue-jsx-merge-props": "^2.0.3",
"babel-jest": "^21.0.2",
"babel-loader": "^7.1.1",
"babel-plugin-dynamic-import-node": "^1.2.0",
"babel-plugin-syntax-jsx": "^6.18.0",
"babel-plugin-transform-es2015-modules-commonjs": "^6.26.0",
"babel-plugin-transform-runtime": "^6.22.0",
"babel-plugin-transform-vue-jsx": "^3.5.0",
"babel-preset-env": "^1.3.2",
"babel-preset-stage-2": "^6.22.0",
"babel-register": "^6.22.0",
"chalk": "^2.0.1",
"chromedriver": "^2.27.2",
"copy-webpack-plugin": "^4.0.1",
"cross-spawn": "^5.0.1",
"css-loader": "^0.28.0",
"eslint": "^4.15.0",
"eslint-config-standard": "^10.2.1",
"eslint-friendly-formatter": "^3.0.0",
"eslint-loader": "^1.7.1",
"eslint-plugin-import": "^2.7.0",
"eslint-plugin-node": "^5.2.0",
"eslint-plugin-promise": "^3.4.0",
"eslint-plugin-standard": "^3.0.1",
"eslint-plugin-vue": "^4.0.0",
"extract-text-webpack-plugin": "^3.0.0",
"file-loader": "^1.1.4",
"friendly-errors-webpack-plugin": "^1.6.1",
"html-webpack-plugin": "^2.30.1",
"jest": "^22.0.4",
"jest-serializer-vue": "^0.3.0",
"nightwatch": "^0.9.12",
"node-notifier": "^5.1.2",
"optimize-css-assets-webpack-plugin": "^3.2.0",
"ora": "^1.2.0",
"portfinder": "^1.0.13",
"postcss-import": "^11.0.0",
"postcss-loader": "^2.0.8",
"postcss-url": "^7.2.1",
"rimraf": "^2.6.0",
"selenium-server": "^3.0.1",
"semver": "^5.3.0",
"shelljs": "^0.7.6",
"uglifyjs-webpack-plugin": "^1.1.1",
"url-loader": "^0.5.8",
"vue-jest": "^1.0.2",
"vue-loader": "^13.3.0",
"vue-style-loader": "^3.0.1",
"vue-template-compiler": "^2.5.2",
"webpack": "^3.6.0",
"webpack-bundle-analyzer": "^2.9.0",
"webpack-dev-server": "^2.9.1",
"webpack-merge": "^4.1.0"
},
"engines": {
"node": ">= 6.0.0",
"npm": ">= 3.0.0"
},
"browserslist": [
"> 1%",
"last 2 versions",
"not ie <= 8"
],
"jest": {
"moduleFileExtensions": [
"js",
"json",
"vue"
],
"transform": {
"^.+\\.js$": "<rootDir>/node_modules/babel-jest",
".*\\.(vue)$": "<rootDir>/node_modules/vue-jest"
},
"moduleNameMapper": {
"^@/(.*)$": "<rootDir>/src/$1"
},
"snapshotSerializers": [
"<rootDir>/node_modules/jest-serializer-vue"
],
"testURL": "http://localhost"
}
}vue项目中添加单元测试
Vue项目的单元测试用的是Vue Test Utils,这是Vue.js 官方的单元测试实用工具库,在Vue和Jest之间提供了一个桥梁,暴露出一些接口,让我们更加方便的通过Jest为Vue应用编写单元测试
官网链接:介绍 | Vue Test Utils
新建Vue项目并使用Jest
1、运行命令vue create ,选择自定义配置
2、按需选择配置,单元测试选择Unit Testing,端到端测试选择B2B Testing
3、接下来按需选择Vue版本以及其他配置,选择Jest,一路回车确定即可,最后需不需要保存配置由你决定
4、项目创建好后,可以看到自动创建的tests文件夹和其下的一个测试文件,以及jest.config.js配置文件
5、运行package.json中的脚本命令 npm run test:unit,即可执行tests文件夹下所有的测试文件(默认后缀为spec.js/spec.ts)以及所有的js/ts文件
已有Vue项目集成Jest
1、在vue项目目录下运行 vue add @vue/cli-plugin-unit-jest 命令,这个命令会帮我们把相关的配置都配好,相关的依赖都装好,并生成jest.config.js文件和一个tests文件夹,目录结构同上面新建的Vue项目的目录结构相同
2、npm run test:unit 运行测试命令
package.json中的测试脚本命令
"scripts": {
"test:unit": "vue-cli-service test:unit --coverage test --reporters=jest-junit",
}- --coverage:全量覆盖率报告,会生成一个coverage文件夹,打开里面的index.html 里面会有详细的信息展示
- test jest --reporters=default --reporters=jest-junit:测试报告,执行这个命令,会生成一个junit.xml文件,但要成功执行这条命令,必须执行 npm i jest-junit --save-dev,安装jest-junit依赖
jest.config.js文件配置
module.exports = {
preset: "@vue/cli-plugin-unit-jest",
verbose: true, // 多于一个测试文件运行时展示每个测试用例测试通过情况
bail: true, // 参数指定只要有一个测试用例没有通过,就停止执行后面的测试用例
testEnvironment: 'jsdom', // 测试环境,jsdom可以在Node虚拟浏览器环境运行测试
moduleFileExtensions: [ // 需要检测测的文件类型
'js',
'jsx',
'json',
// tell Jest to handle *.vue files
'vue'
],
transform: { // 预处理器配置,匹配的文件要经过转译才能被识别,否则会报错
'.+\\.(css|styl|less|sass|scss|jpg|jpeg|png|svg|gif|eot|otf|webp|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga|avif)$':
require.resolve('jest-transform-stub'),
'^.+\\.jsx?$': require.resolve('babel-jest')
},
transformIgnorePatterns: ['/node_modules/'], // 转译时忽略 node_modules
moduleNameMapper: { // 从正则表达式到模块名称的映射,和webpack的alisa类似
'^@/(.*)$': '<rootDir>/src/$1'
},
snapshotSerializers: [ // Jest在快照测试中使用的快照序列化程序模块的路径列表
'jest-serializer-vue'
],
testMatch: [ // Jest用于检测测试的文件,可以用正则去匹配
'**/tests/unit/**/*.spec.[jt]s?(x)',
'**/__tests__/*.[jt]s?(x)'
],
collectCoverage: true, // 覆盖率报告,运行测试命令后终端会展示报告结果
collectCoverageFrom: [ // 需要进行收集覆盖率的文件,会依次进行执行符合的文件
'src/**/*.{js,vue}',
],
coverageReporters: ['html', 'lcov', 'text-summary'], // Jest在编写覆盖率报告的配置,添加"text"或"text-summary"在控制台输出中查看覆盖率摘要
coveragePathIgnorePatterns: ['/node_modules/'], // 需要跳过覆盖率信息收集的文件目录
coverageDirectory: "<rootDir>/tests/unit/coverage", // Jest输出覆盖信息文件的目录,运行测试命令会自动生成如下路径的coverage文件
coverageThreshold: { // 覆盖结果的最低阈值设置,如果未达到阈值,jest将返回失败
global: {
branches: 60,
functions: 80,
lines: 80,
statements: 80,
},
},
testURL: 'http://localhost/', // 官网没有解释,经过尝试可以随意配置ip,如果识别不出是ip则会报错
watchPlugins: [ // jest监视插件
require.resolve('jest-watch-typeahead/filename'),
require.resolve('jest-watch-typeahead/testname')
]
};总结
以上为个人经验,希望能给大家一个参考,也希望大家多多支持脚本之家。
