test.js

//specific values for desktop and mobile
export default {
  desktop: [ 'chrome', 'ie', 'safari'],
  mobile: [ 'iphone', 'android' ]
};

//run all default desktop browsers
export default {
  desktop: true
};

//run specific desktop browsers
//this is tricky because "ie" must run through the BrowserStack Tunnel
export default {
  desktop: ['chrome', 'ie']
};

//run all default mobile devices
export default {
  mobile: true
};

//specify mobile device
export default {
  mobile: ['iphone']
};

//more complicated config could require spawning multiple child process
//and complex merging of data
export default {
  desktop: [{
    browser: 'firefox',
    browser_version: '21.0',
    os: 'OS X',
    os_version: 'Mountain Lion'
  }, 'chrome'],
  mobile: [{
    device: 'iPhone 6',
    os: 'ios',
    os_version: '8.3'
  }, 'android']
}