Persist a paypal developer sandbox login over multiple cucumber & capybara & selenium runs.

cookie_helper.rb

# adapted from https://gist.github.com/nruth/484787
module CookieStepHelper
  def save_selenium_cookie_jar domain
    cookies = Capybara.current_session.driver.browser.manage.all_cookies.select do |cookie|
      domain.end_with? cookie[:domain]
    end
    File.binwrite(cookie_jar_path(domain), Marshal.dump(cookies))
  end

  def load_selenium_cookie_jar domain, fake_domain_url=nil
    return unless File.exist? cookie_jar_path(domain)

    fake_domain_url ||= "http://#{domain}/Obvious404"
    visit fake_domain_url

    cookies = Marshal.load(File.binread(cookie_jar_path(domain)))
    cookies.each do |cookie|
      if domain.end_with? cookie[:domain]
        Capybara.current_session.driver.browser.manage.delete_cookie(cookie[:name])
        Capybara.current_session.driver.browser.manage.add_cookie(cookie)
      end
    end
  end

  private

  def cookie_jar_path domain
    Rails.root.join('tmp', "#{domain}.cookies")
  end
end

World(CookieStepHelper)

paypal.feature

@javascript
Scenario: My Shopping Cart
 Given I'm logged in to the PayPal Sandbox
 And ...

paypal_steps.rb

PAYPAL_EXPECTED_NAME = 'Bob Bobson'
PAYPAL_EMAIL = 'bobtest@bobsworldofbobs.com.au'
PAYPAL_PASSWORD = 'supersecret'

Given(/^I'm logged in to the PayPal Sandbox$/) do
  load_selenium_cookie_jar('developer.paypal.com')

  visit 'https://developer.paypal.com'

  if page.has_selector?('.topnav .enterCredentialsBlock')
    step "I log in to PayPal"
  end

  find('.userinfo').should have_content(PAYPAL_EXPECTED_NAME) # dodgy test username
  save_selenium_cookie_jar('developer.paypal.com')
end

Given(/^I log in to PayPal$/) do
  within('.topnav') do
    click_on 'Log In with PayPal'
  end

  # http://stackoverflow.com/questions/7612038/with-capybara-how-do-i-switch-to-the-new-window-for-links-with-blank-targets
  new_window = page.driver.browser.window_handles.last
  page.within_window new_window do
    find('#email').set PAYPAL_EMAIL
    find('#password').set PAYPAL_PASSWORD
    find('#rememberMe').set true

    click_on 'Log In'
  end

  # Reload the login page rather than waiting for PayPal to do that for us
  visit 'https://developer.paypal.com'
end