trait CKEditorTestTrait in Drupal 8

trait CKEditorTestTrait {

  /**
   * Waits for CKEditor to initialize.
   *
   * @param string $instance_id
   *   (optional) The CKEditor instance ID. Defaults to 'edit-body-0-value'.
   * @param int $timeout
   *   (optional) Timeout in milliseconds, defaults to 10000.
   */
  protected function waitForEditor($instance_id = 'edit-body-0-value', $timeout = 10000) {
    $condition = <<<JS
      (function() {
        return (
          typeof CKEDITOR !== 'undefined'
          && typeof CKEDITOR.instances["{<span class="php-variable">$instance_id</span>}"] !== 'undefined'
          && CKEDITOR.instances["{<span class="php-variable">$instance_id</span>}"].instanceReady
        );
      }());
JS;
    $this
      ->assertJsCondition($condition, $timeout);
  }

  /**
   * Assigns a name to the CKEditor iframe.
   *
   * @param string $id
   *   (optional) The id to assign the iframe element. Defaults to 'ckeditor'.
   * @param string $instance_id
   *   (optional) The CKEditor instance ID. Defaults to 'edit-body-0-value'.
   *
   * @see \Behat\Mink\Session::switchToIFrame()
   */
  protected function assignNameToCkeditorIframe($id = 'ckeditor', $instance_id = 'edit-body-0-value') {
    $javascript = <<<JS
(function(){
  CKEDITOR.instances['{<span class="php-variable">$instance_id</span>}'].element.getParent().find('.cke_wysiwyg_frame').\$[0].id = '{<span class="php-variable">$id</span>}';
})()
JS;
    $this
      ->getSession()
      ->evaluateScript($javascript);
  }

  /**
   * Clicks a CKEditor button.
   *
   * @param string $name
   *   The name of the button, such as `drupallink`, `source`, etc.
   * @param string $instance_id
   *   (optional) The CKEditor instance ID. Defaults to 'edit-body-0-value'.
   */
  protected function pressEditorButton($name, $instance_id = 'edit-body-0-value') {
    $this
      ->getEditorButton($name, $instance_id)
      ->click();
  }

  /**
   * Waits for a CKEditor button and returns it when available and visible.
   *
   * @param string $name
   *   The name of the button, such as `drupallink`, `source`, etc.
   * @param string $instance_id
   *   (optional) The CKEditor instance ID. Defaults to 'edit-body-0-value'.
   *
   * @return \Behat\Mink\Element\NodeElement|null
   *   The page element node if found, NULL if not.
   */
  protected function getEditorButton($name, $instance_id = 'edit-body-0-value') {
    $this
      ->getSession()
      ->switchToIFrame();
    $button = $this
      ->assertSession()
      ->waitForElementVisible('css', "#cke_{$instance_id} a.cke_button__" . $name);
    $this
      ->assertNotEmpty($button);
    return $button;
  }

  /**
   * Asserts a CKEditor button is disabled.
   *
   * @param string $name
   *   The name of the button, such as `drupallink`, `source`, etc.
   * @param string $instance_id
   *   (optional) The CKEditor instance ID. Defaults to 'edit-body-0-value'.
   */
  protected function assertEditorButtonDisabled($name, $instance_id = 'edit-body-0-value') {
    $button = $this
      ->getEditorButton($name, $instance_id);
    $this
      ->assertTrue($button
      ->hasClass('cke_button_disabled'));
    $this
      ->assertSame('true', $button
      ->getAttribute('aria-disabled'));
  }

  /**
   * Asserts a CKEditor button is enabled.
   *
   * @param string $name
   *   The name of the button, such as `drupallink`, `source`, etc.
   * @param string $instance_id
   *   (optional) The CKEditor instance ID. Defaults to 'edit-body-0-value'.
   */
  protected function assertEditorButtonEnabled($name, $instance_id = 'edit-body-0-value') {
    $button = $this
      ->getEditorButton($name, $instance_id);
    $this
      ->assertFalse($button
      ->hasClass('cke_button_disabled'));
    $this
      ->assertSame('false', $button
      ->getAttribute('aria-disabled'));
  }

}