Race Conditions in Capybara

wait_for_ajax.rb

def wait_for_ajax
  Timeout.timeout(Capybara.default_wait_time) do
    loop until finished_all_ajax_requests?
  end
end

def finished_all_ajax_requests?
  page.evaluate_script("jQuery.active").zero?
end

wait_for_selector.rb

def wait_for(*locator)
  raise ArgumentError if locator.blank?

  begin
    Timeout::timeout(10) do
      until page.has_selector?(*locator)
        sleep 0.25
      end
    end
  rescue Timeout::Error
    fail "'#{locator}' did not appear within 10 seconds"
  end
end