The webpage has finished loading, but capybara is still unable to pass the test

During my automation process, I am checking for the completion of

document.readyState === 'complete'
and also monitoring a local variable known as window.renderComplete (which indicates when the server has finished rendering the page).

However, there seems to be an issue where the comparison

Capybara.current_session.driver.browser.title == title
is failing initially for a few iterations before eventually passing after approximately 10 loops. This disrupts the flow of the loop.

I am curious if there is a specific delay between the browser receiving all the data and setting it into variables. Could this be a limitation within Capybara? It's puzzling why there might still be a delay in the browser even when both readyState and renderComplete are confirmed to be true.

renderComplete = page.evaluate_script("(window.renderComplete == true) && (document.readyState === 'complete');")

      if renderComplete
        puts "pass 1"
      else
        loop do
          renderComplete = page.evaluate_script("window.renderComplete == true;")
          break if renderComplete == true
        end
        puts "pass 2"
      end

browser = Capybara.current_session.driver.browser
Timeout::timeout(Capybara.default_max_wait_time) do
    i=1
    loop do
      puts "loop! #{i}"
      i+=1
      break if title == browser.title
    end
  end
assert_equal title, browser.title

Answer №1

Avoid using equal assertions for title and refrain from utilizing driver-specific methods like current_session.driver.xxx. Instead, rely on the title assertion/matcher methods provided by Capybara to verify that a page's title matches your expectations, as they also incorporate built-in waiting and retrying mechanisms.

page.assert_title(expected_title)

Furthermore, exercising caution when employing Timeout::timeout in conjunction with network communication code is crucial, as it can abruptly interrupt processes and leave communications unrecoverable. If implementing timeouts within Capybara, consider using loop sleeps to periodically check conditions rather than relying on Timeout::timeout. For more information on this topic, refer to this resource.

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