edlp_d8/core/tests/Drupal/FunctionalJavascriptTests/JSWebAssert.php

<?php

namespace Drupal\FunctionalJavascriptTests;

use Drupal\Tests\WebAssert;

/**
 * Defines a class with methods for asserting presence of elements during tests.
 */
class JSWebAssert extends WebAssert {

  /**
   * Waits for AJAX request to be completed.
   *
   * @param int $timeout
   *   (Optional) Timeout in milliseconds, defaults to 10000.
   * @param string $message
   *   (optional) A message for exception.
   *
   * @throws \RuntimeException
   *   When the request is not completed. If left blank, a default message will
   *   be displayed.
   */
  public function assertWaitOnAjaxRequest($timeout = 10000, $message = 'Unable to complete AJAX request.') {
    $result = $this->session->wait($timeout, '(typeof(jQuery)=="undefined" || (0 === jQuery.active && 0 === jQuery(\':animated\').length))');
    if (!$result) {
      throw new \RuntimeException($message);
    }
  }

}