text: const base = require('./karma.base.conf')
  const pack = require('../package.json')
  
  /**
   * Having too many tests running concurrently on saucelabs
   * causes timeouts and errors, so we have to run them in
   * smaller batches.
   */
  
  const batches = [
    // the coolkids
    {
      sl_chrome: {
        base: 'SauceLabs',
        browserName: 'chrome',
        platform: 'Windows 7'
      },
      sl_firefox: {
        base: 'SauceLabs',
        browserName: 'firefox'
      },
      sl_mac_safari: {
        base: 'SauceLabs',
        browserName: 'safari',
        platform: 'OS X 10.10'
      }
    },
    // ie family
    {
      sl_ie_9: {
        base: 'SauceLabs',
        browserName: 'internet explorer',
        platform: 'Windows 7',
        version: '9'
      },
      sl_ie_10: {
        base: 'SauceLabs',
        browserName: 'internet explorer',
        platform: 'Windows 8',
        version: '10'
      },
      sl_ie_11: {
        base: 'SauceLabs',
        browserName: 'internet explorer',
        platform: 'Windows 8.1',
        version: '11'
      },
      sl_edge: {
        base: 'SauceLabs',
        platform: 'Windows 10',
        browserName: 'MicrosoftEdge'
      }
    },
    // mobile
    {
      sl_ios_safari: {
        base: 'SauceLabs',
        browserName: 'iphone',
        platform: 'OS X 10.9',
        version: '7.1'
      },
      sl_android: {
        base: 'SauceLabs',
        browserName: 'android',
        platform: 'Linux',
        version: '4.2'
      }
    }
  ]
  
  module.exports = config => {
    const batch = batches[process.argv[5] || 0]
  
    config.set(Object.assign(base, {
      singleRun: true,
      browsers: Object.keys(batch),
      customLaunchers: batch,
      reporters: process.env.CI
        ? ['dots', 'saucelabs'] // avoid spamming CI output
        : ['progress', 'saucelabs'],
      sauceLabs: {
        testName: `${pack.name} unit tests`,
        recordScreenshots: false,
        build: process.env.CIRCLE_BUILD_NUM || process.env.SAUCE_BUILD_ID || Date.now()
      },
      captureTimeout: 300000,
      browserNoActivityTimeout: 300000
    }))
  }
  