test.js

#!/usr/bin/env node

const webdriver = require('selenium-webdriver')
const browserstack = require('browserstack-local')
const local = new browserstack.Local()

var capabilities = {
  'build': 'Docker example',
  'browserName': 'chrome',
  'os': 'OS X',
  'browserstack.local': true,
  'browserstack.user': process.env.BROWSERSTACK_USERNAME,
  'browserstack.key': process.env.BROWSERSTACK_ACCESS_KEY
}

var options = {
  'key': process.env.BROWSERSTACK_ACCESS_KEY
}

console.log('Starting tunnel...')

local.start(options, function (error) {
  if (error) {
    console.error('Received error while starting tunnel', error)
    process.exit(1)
  }
  console.log('Is Running', local.isRunning())
  console.log('Started')

  var driver = new webdriver.Builder().usingServer('http://hub.browserstack.com/wd/hub').withCapabilities(capabilities).build()
  driver.get('http://www.browserstack.com').then(function () {
    driver.getTitle().then(function (title) {
      console.log(title)
    })
    driver.quit().then(function () {
      local.stop(function () {
        console.log('Stopped')
      })
    })
  })
})