Selenium Webdriver Unable to create chrome webdriver instance - ruby

Question

We've been running integration tests successfully against Rails 2 using Selenium on both chrome and firefox. However, we've recently upgraded to Rails 3 and are running into issues creating a chrome webdriver instance.
When we attempt to create, we get the following stack:
irb(main):002:0> profile = Selenium::WebDriver::Chrome::Profile.new
translate])#<Selenium::WebDriver::Chrome::Profile:0x64f2fd0 #extensions=[], #model=nil>
irb(main):003:0> profile['download.prompt_for_download'] = false
false
irb(main):004:0> driver = Selenium::WebDriver.for(:chrome, :profile => profile, :switches => %w[--ignore-certificate-errors --disable-popup-blocking --disable-translate])
ArgumentError: wrong number of arguments (0 for 1)
from /var/www/myapp/shared/bundle/ruby/1.8/gems/selenium-webdriver-2.27.2/lib/selenium/webdriver/common/platform.rb:157:in `open'
from /var/www/myapp/shared/bundle/ruby/1.8/gems/selenium-webdriver-2.27.2/lib/selenium/webdriver/common/platform.rb:157:in `ip'
from /var/www/myapp/shared/bundle/ruby/1.8/gems/selenium-webdriver-2.27.2/lib/selenium/webdriver/common/platform.rb:170:in `interfaces'
from /var/www/myapp/shared/bundle/ruby/1.8/gems/selenium-webdriver-2.27.2/lib/selenium/webdriver/common/port_prober.rb:23:in `free?'
from /var/www/myapp/shared/bundle/ruby/1.8/gems/selenium-webdriver-2.27.2/lib/selenium/webdriver/common/port_prober.rb:5:in `above'
from /var/www/myapp/shared/bundle/ruby/1.8/gems/selenium-webdriver-2.27.2/lib/selenium/webdriver/chrome/service.rb:33:in `default_service'
from /var/www/myapp/shared/bundle/ruby/1.8/gems/selenium-webdriver-2.27.2/lib/selenium/webdriver/chrome/bridge.rb:14:in `initialize'
from /var/www/myapp/shared/bundle/ruby/1.8/gems/selenium-webdriver-2.27.2/lib/selenium/webdriver/common/driver.rb:37:in `new'
from /var/www/myapp/shared/bundle/ruby/1.8/gems/selenium-webdriver-2.27.2/lib/selenium/webdriver/common/driver.rb:37:in `for'
from /var/www/myapp/shared/bundle/ruby/1.8/gems/selenium-webdriver-2.27.2/lib/selenium/webdriver.rb:67:in `for'
from (irb):4
Any tips?

Answer 1

I saw this when I had included a gem which included the "backports" gem as part of its dependencies into my Gemfile. The backports gem rewrites some Ruby 1.8 internals, which overwrote parts of the UDPSocket core class. Try getting rid of the backports gem and giving it a shot.

Answer 2

ChromeDriver Installation:
Download Chromedriver 2.x from "http://chromedriver.storage.googleapis.com/index.html?path=2.8/." Unzip it and save it in a folder on any drive. Set path by following steps :
Copy the path till chromedriver.exe
Right click on Computer and select ‘Properties’
Select ‘Advanced system variables’
Select ‘Environment variables’
Click on Edit button for ‘Path’ variable of ‘User variables’
Append the chromedriver path
Save changes.
Run Selenium Test :
Now run your selenium test. It will run on the chrome browser.
Sample Code
require 'selenium-webdriver'
$driver = Selenium::WebDriver.for :chrome
$driver.navigate.to "https://www.google.co.in/"
$driver.manage().window().maximize()
$driver.quit()
NOTE : You need to install latest chromedriver for latest version of Chrome browser

Answer 3

This was caused by an interference with the backports gem and the fact that the socket library reuses IO.open although it changes the interface.
Upgrading backports to v2.6.7 or above should resolve this.