class MenuLinkSecurityTest

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>');
  }

}