MenuUninstallTest.php

<?php

namespace Drupal\Tests\menu_ui\Functional;

use Drupal\Tests\BrowserTestBase;
use Drupal\system\Entity\Menu;

/**
 * Tests that uninstalling menu does not remove custom menus.
 *
 * @group menu_ui
 */
class MenuUninstallTest extends BrowserTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    public static $modules = [
        'menu_ui',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Tests Menu uninstall.
     */
    public function testMenuUninstall() {
        \Drupal::service('module_installer')->uninstall([
            'menu_ui',
        ]);
        \Drupal::entityTypeManager()->getStorage('menu')
            ->resetCache([
            'admin',
        ]);
        $this->assertNotEmpty(Menu::load('admin'), 'The \'admin\' menu still exists after uninstalling Menu UI module.');
    }

}