Issue #3294076 by longwave: Remove unused ExceptionTestSiteSubscriber

    tags:

      - { name: event_subscriber }

    arguments: ['@config.factory', '@http_kernel']

  exception.test_site:

    class: Drupal\Core\EventSubscriber\ExceptionTestSiteSubscriber

    tags:

      - { name: event_subscriber }

  exception.enforced_form_response:

    class: Drupal\Core\EventSubscriber\EnforcedFormResponseSubscriber

    tags:

<?php

namespace Drupal\Core\EventSubscriber;

use Drupal\Core\Utility\Error;

use Symfony\Component\HttpKernel\Event\ExceptionEvent;

/**

 * Custom handling of errors when in a system-under-test.

 */

class ExceptionTestSiteSubscriber extends HttpExceptionSubscriberBase {

  /**

   * {@inheritdoc}

   */

  protected static function getPriority() {

    return 3;

  }

  /**

   * {@inheritdoc}

   */

  protected function getHandledFormats() {

    return ['html'];

  }

  /**

   * Checks for special handling of errors inside Simpletest.

   *

   * @todo The $headers array appears to not actually get used at all in the

   *   original code. It's quite possible that this entire method is now

   *   vestigial and can be removed.

   *

   * @param \Symfony\Component\HttpKernel\Event\ExceptionEvent $event

   *   The event.

   */

  public function on500(ExceptionEvent $event) {

    $exception = $event->getThrowable();

    $error = Error::decodeException($exception);

    $headers = [];

    // When running inside the testing framework, we relay the errors

    // to the tested site by the way of HTTP headers.

    if (DRUPAL_TEST_IN_CHILD_SITE && !headers_sent() && (!defined('SIMPLETEST_COLLECT_ERRORS') || SIMPLETEST_COLLECT_ERRORS)) {

      // $number does not use drupal_static as it should not be reset

      // as it uniquely identifies each PHP error.

      static $number = 0;

      $assertion = [

        $error['@message'],

        $error['%type'],

        [

          'function' => $error['%function'],

          'file' => $error['%file'],

          'line' => $error['%line'],

        ],

      ];

      $headers['X-Drupal-Assertion-' . $number] = rawurlencode(serialize($assertion));

      $number++;

    }

  }

}