karma.browserstack.js

// browserstack (read: IE11) config
const karma = require('./karma.common.js')
const appComponents = require('./app_components.js')

const browserStackLauncher = {
  ie11: {
    'base': 'BrowserStack',
    'browser': 'ie',
    'browser_version': '11.0',
    'os': 'Windows',
    // Pick OS from the env variable or use Windows 7
    'os_version': process.env.OS || '7',
    'name': appComponents.id
  }
}

const options = {
  preprocessors: {
    [appComponents.all[appComponents.id]]: ['webpack', 'gzip'],
  },

  // Browsers configuration
  browsers: [Object.keys(browserStackLauncher)],

  customLaunchers: browserStackLauncher,

  browserStack: {
    // Increase polling time to avoid hitting BS rate limit, default is 1000
    pollingTimeout: 5 * 1000, /* 5 seconds */

    // https://github.com/karma-runner/karma-browserstack-launcher/issues/17#issuecomment-181559755
    startTunnel: true,

    // if tests ain't completed during this timespan IE is stalled
    timeout: 4 * 60, /* 4 minutes */

    name: process.env.BUILD_TAG || false,

    project: 'Platform'
  },

  // We are limited in the number of parallel VMs in BrowserStack (5)
  // and Karma don't know how to limit parallel browser instances
  // so waiting time must be insanely high. Default is 10 * 1000
  browserNoActivityTimeout: 3 * 60 * 1000, /* 3 minutes */

  captureTimeout: 90 * 1000, /* 1.5 minutes */

  // Make Karma more tolerant to disconnects. It's required to make
  // BrowserStack tests more stable. Default is 2000.
  browserDisconnectTimeout: 30 * 1000, /* 30 sec */

  browserDisconnectTolerance: 5,

  // Reporters configuration
  reporters: ['mocha', 'BrowserStack'],

  mochaReporter: {
    output: 'minimal'
  }
}

module.exports = function (config) {
  karma(config, options)
}