trait GridStackTestTrait in GridStack 8.2

trait GridStackTestTrait {

  /**
   * Verifies the logged in user has access to the various pages.
   *
   * @param array $pages
   *   The array of pages we want to test.
   * @param int $response
   *   (optional) An HTTP response code. Defaults to 200.
   */
  protected function verifyPages(array $pages = [], $response = 200) {
    foreach ($pages as $page) {
      $this
        ->drupalGet($page);
      $this
        ->assertSession()
        ->statusCodeEquals($response);
    }
  }

  /**
   * Wraps the submit form.
   *
   * @param string $page
   *   The page we want to test.
   * @param array $content
   *   The content to submit.
   * @param string $submit
   *   The submit text.
   * @param int $response
   *   (optional) An HTTP response code. Defaults to 200.
   * @param string $message
   *   The message text.
   */
  protected function verifySubmitForm($page = '', array $content = [], $submit = 'Save', $response = 200, $message = '') {
    $this
      ->drupalGet($page);
    $this
      ->submitForm($content, $submit);
    $this
      ->assertResponse($response, $message);
  }

  /**
   * Update a blazy setting.
   *
   * @param string $setting
   *   The name of the setting.
   * @param string $value
   *   The value.
   * @param string $config
   *   The config.
   */
  protected function updateConfig($setting, $value, $config = 'blazy.settings') {
    \Drupal::configFactory()
      ->getEditable($config)
      ->set($setting, $value)
      ->save();
  }

}