cakephp/tests/test_app/TestApp/Controller/Admin/ErrorController.php

<?php
/**
 * CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 * @link          https://cakephp.org CakePHP(tm) Project
 * @since         3.7.0
 * @license       https://opensource.org/licenses/mit-license.php MIT License
 */
namespace TestApp\Controller\Admin;

use Cake\Controller\Controller;
use Cake\Event\Event;

/**
 * Error Handling Controller
 *
 * Controller used by ErrorHandler to render error views.
 */
class ErrorController extends Controller
{
    /**
     * Initialization hook method.
     *
     * @return void
     */
    public function initialize()
    {
        $this->loadComponent('RequestHandler');
    }

    /**
     * beforeRender callback.
     *
     * @param \Cake\Event\Event $event Event.
     * @return void
     */
    public function beforeRender(Event $event)
    {
        $this->viewBuilder()->setTemplatePath('Error');
    }
}