text: var test = require('tape')
  var webdriver = require('selenium-webdriver')
  
  var driver = new webdriver
    .Builder()
    .forBrowser('firefox')
    .build()
  
  test('open a page, create a variable and get its value', function (t) {
    t.plan(1)
  
    driver.get('http://ya.ru')
    driver.executeScript('window.a = "blabla";')
    driver.sleep(2000)
    driver.executeScript('return a').then(function (val) {
      console.log(val)
      t.equal(val, 'blabla')
    })
    driver.sleep(5000)
    driver.quit()
  })
  