karma.conf.js

// Karma configuration
var webpackConfig = require('./webpack.config.js')('dev');

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: ['jasmine'],

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

    // list of files / patterns 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','coverage'],
      './test/**/*.js': ['webpack']
    },

    webpack: webpackConfig,

    // test results reporter to use
    // possible values: 'dots', 'progress', 'coverage'
    // available reporters: https://npmjs.org/browse/keyword/karma-reporter
    reporters: ['progress', 'coverage', 'junit'],
      junitReporter: {
          outputFile: './coverage/TEST-results.xml',
          suite: ''
      },
    coverageReporter: {
        dir: 'coverage/',
            reporters: [
              {
                  type: 'cobertura',
                  subdir: '.',
                  file: 'coverage.xml'
              },
              {
                  type: 'lcov'
              },
              {
                  type: 'lcovonly',
                  subdir: '.',
                  file: 'lcov.info'
              }
          ]
      },

    // 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: false,

    // start these browsers
    // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
    // Definitions of those browsers are in customLaunchers section below.
    browsers: ['MyHeadlessChrome'],
    // browsers: ['Chrome','Firefox', 'Safari','Opera'],
    // browsers: ['Chrome','Firefox', 'Safari','Opera',
    //            'bs_ie10_windows','bs_ie11_windows','bs_edge_windows'],

    // plugins
    plugins: ['karma-jasmine', 'karma-webpack',
              'karma-chrome-launcher','karma-firefox-launcher','karma-browserstack-launcher',
              'karma-safari-launcher','karma-opera-launcher', 'karma-coverage', 'karma-junit-reporter'],

    // browserStack configuration
    browserStack: {
      username: process.env.BROWSERSTACK_USERNAME,
      accessKey: process.env.BROWSERSTACK_KEY,
    },

    captureTimeout: 210000,
    browserDisconnectTolerance: 3, 
    browserDisconnectTimeout : 210000,
    browserNoActivityTimeout : 210000,

    // Those definitions are for BrowserStack.
    customLaunchers: {
        // windows
        bs_ie6_windows: {
            base: 'BrowserStack',
            browser: 'ie',
            browser_version: '6.0',
            os: 'Windows',
            os_version: 'XP'
        },
        bs_ie7_windows: {
            base: 'BrowserStack',
            browser: 'ie',
            browser_version: '7.0',
            os: 'Windows',
            os_version: 'XP'
        },
        bs_ie8_windows: {
            base: 'BrowserStack',
            browser: 'ie',
            browser_version: '8.0',
            os: 'Windows',
            os_version: '7'
        },
        bs_ie9_windows: {
            base: 'BrowserStack',
            browser: 'ie',
            browser_version: '9.0',
            os: 'Windows',
            os_version: '7'
        },
        bs_ie10_windows: {
            base: 'BrowserStack',
            browser: 'ie',
            browser_version: '10.0',
            os: 'Windows',
            os_version: '7'
        },
        bs_ie11_windows: {
            base: 'BrowserStack',
            browser: 'ie',
            browser_version: '11.0',
            os: 'Windows',
            os_version: '7'
        },
        bs_edge_windows: {
            base: 'BrowserStack',
            browser: 'edge',
            browser_version: '16.0',
            os: 'Windows',
            os_version: '10'
        },
        MyHeadlessChrome: {
            base: 'ChromeHeadless',
            flags: ['--disable-translate', '--disable-extensions', '--remote-debugging-port=9223',
            '--no-sandbox']
        }

    },

    // 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
  })
}