karma.conf.js

// Karma configuration
const isCI = process.env.NODE_CI || process.env.TRAVIS;

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: ['mocha', 'chai'],


    // list of files / patterns to load in the browser
    files: [
      'test/**/*.test.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: {
      'src/**/*.js': ['webpack', 'sourcemap'],
      'test/**/*.js': ['webpack', 'sourcemap']
    },


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


    // 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: !isCI,


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


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


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


    // Webpack
    webpack: {
      devtool: 'inline-source-map',
      externals: {
        'cheerio': 'window',
        'react/addons': true,
        'react/lib/ExecutionEnvironment': true,
        'react/lib/ReactContext': true,
      },
      module: {
        loaders: [{
          loader: 'babel',
          test: /\.js$/,
          exclude: /(node_modules)/,
          query: {
            presets: [
              'react',
              'es2015',
              'stage-1'
            ]
          }
        }]
      }
    },
    webpackServer: {
      noInfo: true
    },
  });
};