MenuLinkSecurityTest.php

<?php

namespace Drupal\Tests\system\Functional\Menu;

use Drupal\menu_link_content\Entity\MenuLinkContent;
use Drupal\Tests\BrowserTestBase;

/**
 * Ensures that menu links don't cause XSS issues.
 *
 * @group Menu
 */
class MenuLinkSecurityTest extends BrowserTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'menu_link_content',
        'block',
        'menu_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Ensures that a menu link does not cause an XSS issue.
     */
    public function testMenuLink() {
        $menu_link_content = MenuLinkContent::create([
            'title' => '<script>alert("Wild animals")</script>',
            'menu_name' => 'tools',
            'link' => [
                'uri' => 'route:<front>',
            ],
        ]);
        $menu_link_content->save();
        $this->drupalPlaceBlock('system_menu_block:tools');
        $this->drupalGet('<front>');
        $this->assertSession()
            ->responseNotContains('<script>alert("Wild animals")</script>');
        $this->assertSession()
            ->responseNotContains('<script>alert("Even more wild animals")</script>');
        $this->assertSession()
            ->assertEscaped('<script>alert("Wild animals")</script>');
        $this->assertSession()
            ->assertEscaped('<script>alert("Even more wild animals")</script>');
    }

}