未捕获的 ReferenceError：在 karma start karma.conf.js 上未定义要求

Question

使用 Karma 和 Jasmine 在 rails 应用的 Angular 前端进行单元测试。看来我已经做了人类已知的所有事情来解决这个错误，并且我的 package.json 中有一百万个依赖项。这是我的 Karma.conf.js：

module.exports = function(config) {
  config.set({

// base path that will be used to resolve all patterns (eg. files, exclude)
basePath: '',

// frameworks to use
// available frameworks: https://npmjs.org/browse/keyword/karma-adapter

// list of files / patterns to load in the browser
files: [
   //angular mocks
  'bower_components/angular/angular.js',
  'bower_components/angular-mocs/angular-mocks.js',
  'bower_components/angular-resource/angular-resource.js',

  //load modules
  'public/app/app.js',

  //test file locations
  'app/**/*.js',
  'spec/**/*.js',
  'public/**/*.js'

],

// list of files to exclude
exclude: [
],

// preprocess matching files before serving them to the browser
// available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
preprocessors: {
},


// test results reporter to use
// possible values: 'dots', 'progress'
// available reporters: https://npmjs.org/browse/keyword/karma-reporter
reporters: ['progress'],


// web server port
port: 9876,


// enable / disable colors in the output (reporters and logs)
colors: true,


// level of logging
// possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
logLevel: config.LOG_INFO,


// enable / disable watching file and executing tests whenever any file changes
autoWatch: true,


// start these browsers
// available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
browsers: ['Chrome', 'Firefox'],


// Continuous Integration mode
// if true, Karma captures browsers, runs the tests and exits
singleRun: false,

// Concurrency level
// how many browser should be started simultaneous
concurrency: Infinity,

plugins : [
  'karma-requirejs',
  'karma-jasmine',
  'karma-chrome-launcher',
  'karma-firefox-launcher',
  'karma-browserify'
],

frameworks: ['jasmine', 'browserify']

  })
}

这里有什么明显的我做错了吗？我希望有，看起来我已经在这里实现了几个解决方案，但并不完全知道发生了什么。谢谢！

我的 app.js 文件的第一行出现错误，带有“require”

Answer 1

浏览器不理解要求，因此您需要在将文件提供给浏览器之前对其进行预处理。您可以将 webpack 配置到 karma.config 中，以便 karma 可以在测试之前使用 webpack 预处理您的文件。你还需要安装 karma webpack，

npm i --save-dev karma-webpack

有很多方法可以做到这一点，我就是这样做的。

var path = require('path');
var webpackConfig = require('./webpack.config');
var entry = path.resolve(webpackConfig.context, webpackConfig.entry);
var preprocessors = {};
preprocessors[entry] = ['webpack'];
module.exports = function(config) {
  config.set({

    // base path that will be used to resolve all patterns (eg. files, exclude)
    basePath: '',


    // frameworks to use
    // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
    frameworks: ['chai','mocha'],


    // list of files / patterns to load in the browser
    files: [entry],
    webpack:webpackConfig,

    // list of files to exclude
    exclude: [
    ],


    // preprocess matching files before serving them to the browser
    // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
    preprocessors:preprocessors,


    // test results reporter to use
    // possible values: 'dots', 'progress'
    // available reporters: https://npmjs.org/browse/keyword/karma-reporter
    reporters: ['progress'],


    // web server port
    port: 9876,


    // enable / disable colors in the output (reporters and logs)
    colors: true,


    // level of logging
    // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
    logLevel: config.LOG_INFO,


    // enable / disable watching file and executing tests whenever any file changes
    autoWatch: true,


    // start these browsers
    // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
    browsers: ['Chrome'],


    // Continuous Integration mode
    // if true, Karma captures browsers, runs the tests and exits
    singleRun: false,

    // Concurrency level
    // how many browser should be started simultanous
    concurrency: Infinity,
    plugins:[
      require('karma-webpack'),
      ('karma-chai'),
      ('karma-mocha'),
      ('karma-chrome-launcher')
    ]
  })
}

here is a seed i worked on with karma, webpack, angularjs.

看看，祝你好运。

Answer 2

如果您使用 require 加载模块，请按照本指南设置 Karma：

https://karma-runner.github.io/0.8/plus/RequireJS.html

或者如果你使用 browserify 进行捆绑，试试这个：

https://github.com/nikku/karma-browserify

你可能还想看看这个问题：How to test browserify project using karma/jasmine