OffCanvasTestTrait.php

<?php

namespace Drupal\Tests\system\Traits;


/**
 * Provides helper methods for interacting with the off-canvas area.
 *
 * This trait is only useful in functional JavaScript tests which need to use
 * the off-canvas area. Tests using this trait should also list off_canvas_test
 * in their $modules property.
 */
trait OffCanvasTestTrait {
  
  /**
   * Waits for the off-canvas area to appear, resized and visible.
   */
  protected function waitForOffCanvasArea() : void {
    // The data-resize-done attribute is added by the off_canvas_test module's
    // wrapper around Drupal.offCanvas.resetSize.
    $this->assertNotEmpty($this->assertSession()
      ->waitForElementVisible('css', '[data-resize-done="true"]'));
    // Remove the data-resize-done attribute so in scenarios where off-canvas
    // opens yet another off-canvas, waitForOffCanvasArea() is looking for the
    // attribute on a new dialog, not an existing one.
    $this->getSession()
      ->executeScript('document.querySelector("[data-resize-done]").removeAttribute("data-resize-done")');
  }

}