trait PanelsIPETrait in Lightning Layout 8

trait PanelsIPETrait {

  /**
   * Saves the Panels IPE layout.
   */
  protected function saveLayout() {
    $this
      ->assertSession()
      ->elementExists('named', [
      'link',
      'Save',
    ], $this
      ->getTray())
      ->click();
    $this
      ->assertSession()
      ->waitForElement('css', '#panels-ipe-tray:not(.unsaved)');
  }

  /**
   * Opens the form to add a block to the Panels IPE layout.
   *
   * @param string $plugin_id
   *   The block plugin ID.
   * @param string $category
   *   The category of the block.
   *
   * @return \Behat\Mink\Element\NodeElement
   *   The block form.
   */
  protected function getBlockForm($plugin_id, $category) {
    $assert = $this
      ->assertSession();
    $tab = $this
      ->getTab('Manage Content');
    $category = $assert
      ->elementExists('css', '.ipe-category[data-category="' . $category . '"]', $tab);
    if (!$category
      ->hasClass('active')) {
      $category
        ->click();
      $assert
        ->assertWaitOnAjaxRequest();
    }
    $assert
      ->elementExists('css', '.ipe-block-plugin a[data-plugin-id="' . $plugin_id . '"]', $tab)
      ->click();
    $block_form = $assert
      ->waitForElementVisible('css', '.panels-ipe-block-plugin-form');
    $this
      ->assertNotEmpty($block_form);
    return $block_form;
  }

  /**
   * Opens a tab in the Panels IPE tray and returns its contents.
   *
   * @param string $label
   *   The label of the tab.
   *
   * @return \Behat\Mink\Element\NodeElement
   *   The tab contents.
   */
  protected function getTab($label) {
    $tray = $this
      ->getTray();
    $tray
      ->clickLink($label);
    $assert = $this
      ->assertSession();
    $assert
      ->assertWaitOnAjaxRequest();
    return $assert
      ->elementExists('css', '.ipe-tabs-content', $tray);
  }

  /**
   * Returns the Panels IPE tray.
   *
   * @return \Behat\Mink\Element\NodeElement
   *   The tray element.
   */
  protected function getTray() {
    return $this
      ->assertSession()
      ->elementExists('css', '#panels-ipe-tray');
  }

}