trait SortableTestTrait in Drupal 8

trait SortableTestTrait {

  /**
   * Define to provide any necessary callback following layout change.
   *
   * @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 $to
   *   The HTML selector for the target container.
   */
  protected abstract function sortableUpdate($item, $from, $to = NULL);

  /**
   * 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) {
    $item = addslashes($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);
  }

}