TestPageTestController.php

<?php

namespace Drupal\test_page_test\Controller;

use Drupal\user\Entity\Role;

/**
 * Controller routines for test_page_test routes.
 */
class TestPageTestController {
    
    /**
     * Returns a test page and sets the title.
     */
    public function testPage() {
        $link_text = t('Visually identical test links');
        return [
            '#title' => t('Test page'),
            '#markup' => t('Test page text.') . "<a href=\"/user/login\">{$link_text}</a><a href=\"/user/register\">{$link_text}</a>",
            '#attached' => [
                'drupalSettings' => [
                    'test-setting' => 'azAZ09();.,\\\\/-_{}',
                ],
            ],
        ];
    }
    
    /**
     * Returns a test page and with the call to the dump() function.
     */
    public function testPageVarDump() {
        $role = Role::create([
            'id' => 'test_role',
            'label' => 'Test role',
        ]);
        dump($role);
        return [
            '#title' => t('Test page with var dump'),
            '#markup' => t('Test page text.'),
        ];
    }

}