karma.conf.js

// Karma configuration
// Generated on Sat May 28 2016 18:09:57 GMT-0700 (PDT)
const SINGLE_RUN = process.env.SINGLE_RUN || false;
module.exports = function(config) {
  config.set({
    // base path that will be used to resolve all patterns (eg. files, exclude)
    basePath: './',

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

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

    // add all your files here in order,
    // including non-commonJS files you need to load before your test cases 
    // list of files / patterns to load in the browser
    files: [
      'specs/**/*.spec.js'
    ],

    // preprocess matching files before serving them to the browser
    // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
    preprocessors: {
      'src/**/*.js': [ 'browserify' ],
      'specs/**/*.spec.js': [ 'browserify' ]
    },

    browserify: {
      debug: true,
      transform: [ 
        ['babelify', {
          presets: [ "es2015", "es2016", "es2017" ],
          plugins: [ "add-module-exports", "transform-object-rest-spread", "transform-object-assign" ]
        }] 
      ],
      extensions: [ '.js' ]
    },

    // 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: !SINGLE_RUN,

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

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

  });
};