my.conf.js

// Karma configuration
// Generated on Tue Jan 05 2016 19:40:48 GMT-0600 (CST)

module.exports = function (config) {
  var configuration = {

    // 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' ],


    // list of files / patterns to load in the browser
    files: [
      'test.jsx'
    ],

    // 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: {
      // add webpack as preprocessor
      'test.jsx': [ 'webpack' ]
    },

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

    customLaunchers: {
      Chrome_travis_ci: {
        base: 'Chrome',
        flags: [ '--no-sandbox' ]
      }
    },

    // 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: true,

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

    // plugins
    plugins: [
      require("karma-webpack"),
      require('karma-mocha'),
      require('karma-chrome-launcher')
    ],

    webpack: {
      externals: {},
      module: {
        loaders: [
          {
            test: /\.jsx?$/,
            exclude: /node_modules/,
            loader: 'babel'
          }
        ]
      }
    }
  };

  if (process.env.TRAVIS) {
    configuration.browsers = [ 'Chrome_travis_ci' ];
  }

  config.set(configuration);
};