Updated Drupal to 8.6. This goes with the following updates because it's possible...

[yaffs-website] / web / core / modules / media / tests / src / Functional / Hal / MediaHalJsonCookieTest.php

<?php

namespace Drupal\Tests\media\Functional\Hal;

use Drupal\Tests\rest\Functional\CookieResourceTestTrait;

/**
 * @group hal
 */
class MediaHalJsonCookieTest extends MediaHalJsonAnonTest {

  use CookieResourceTestTrait;

  /**
   * {@inheritdoc}
   */
  protected static $auth = 'cookie';

}