Twitter authentication/login with Capybara and Selenium

twitterauth.rb

# Call this function after you click the 'sign in with twitter' button on your website
# It switches to the popup, logs in, then switches back to your site.

def auth_with_twitter(username, password = @@default_password)
  # Twitter auth
  page.driver.browser.switch_to.window page.driver.browser.window_handles.last do

    # If logged in, force log out.
    if !page.has_css? "#username_or_email"
      find('.current-user a').click
      within('.signout') do
        find('input[type=submit]').click
      end
    end

    fill_in "username_or_email", :with => username
    fill_in "password", :with => password

    click_button "Authorize app"

  end

  # Come back to this window
  page.driver.browser.switch_to.window(page.driver.browser.window_handles[0])
end