helper for waiting that all dom manipulation had completed

gistfile1.rb

#will wait until all dom elements are rendered
def wait_for_dom(timeout = Capybara.default_wait_time)
  uuid = SecureRandom.uuid
  page.find(:xpath, "//body")
  page.evaluate_script <<-EOS
    _.defer(function() {
      $('body').append("<div id='#{uuid}'></div>");
    });
  EOS
  wait_until(timeout) {page.find(:xpath, "//div[@id='#{uuid}']")}
end