trait SortableTestTrait in Entity Embed 8

trait SortableTestTrait {

  /**
   * {@inheritdoc}
   */
  protected function sortableUpdate($item, $from, $to = NULL) {
    $script = <<<JS
(function () {
  // Set backbone model after a DOM change.
  Drupal.ckeditor.models.Model.set('isDirty', true);
})()

JS;
    $options = [
      'script' => $script,
      'args' => [],
    ];
    $this
      ->getSession()
      ->getDriver()
      ->getWebDriverSession()
      ->execute($options);
  }

  /**
   * Simulates a drag on an element from one container to another.
   *
   * @param string $item
   *   The HTML selector for the element to be moved.
   * @param string $from
   *   The HTML selector for the previous container element.
   * @param null|string $to
   *   The HTML selector for the target container.
   */
  protected function sortableTo($item, $from, $to) {

    // Versions of Drupal older than 8.8 allow normal Selenium-style dragging
    // and dropping.
    if (version_compare(\Drupal::VERSION, '8.8.0', '<')) {
      $this
        ->doLegacyDrag($item, $to);
      return;
    }
    $item = addslashes($item);
    $from = addslashes($from);
    $to = addslashes($to);
    $script = <<<JS
(function (src, to) {
  var sourceElement = document.querySelector(src);
  var toElement = document.querySelector(to);

  toElement.insertBefore(sourceElement, toElement.firstChild);
})('{<span class="php-variable">$item</span>}', '{<span class="php-variable">$to</span>}')

JS;
    $options = [
      'script' => $script,
      'args' => [],
    ];
    $this
      ->getSession()
      ->getDriver()
      ->getWebDriverSession()
      ->execute($options);
    $this
      ->sortableUpdate($item, $from, $to);
  }

  /**
   * Simulates a drag moving an element after its sibling in the same container.
   *
   * @param string $item
   *   The HTML selector for the element to be moved.
   * @param string $target
   *   The HTML selector for the sibling element.
   * @param string $from
   *   The HTML selector for the element container.
   */
  protected function sortableAfter($item, $target, $from) {
    $item = addslashes($item);
    $target = addslashes($target);
    $from = addslashes($from);
    $script = <<<JS
(function (src, to) {
  var sourceElement = document.querySelector(src);
  var toElement = document.querySelector(to);

  toElement.insertAdjacentElement('afterend', sourceElement);
})('{<span class="php-variable">$item</span>}', '{<span class="php-variable">$target</span>}')

JS;
    $options = [
      'script' => $script,
      'args' => [],
    ];
    $this
      ->getSession()
      ->getDriver()
      ->getWebDriverSession()
      ->execute($options);
    $this
      ->sortableUpdate($item, $from);
  }
  protected function doLegacyDrag($item, $target) {
    $assert_session = $this
      ->assertSession();
    $target = $assert_session
      ->elementExists('css', $target);
    $assert_session
      ->elementExists('css', $item)
      ->dragTo($target);
  }

}