MenuConfigFilesTest.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Test\Integrity\Modular;

use Magento\Framework\Module\Dir;

class MenuConfigFilesTest extends \PHPUnit\Framework\TestCase
{
    /**
     * @var \Magento\Backend\Model\Menu\Config\Reader
     */
    protected $_model;

    protected function setUp()
    {
        $urnResolver = new \Magento\Framework\Config\Dom\UrnResolver();
        $schemaFile = $urnResolver->getRealPath('urn:magento:module:Magento_Backend:etc/menu.xsd');
        $this->_model = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(
            \Magento\Backend\Model\Menu\Config\Reader::class,
            ['perFileSchema' => $schemaFile, 'isValidated' => true]
        );
    }

    public function testValidateMenuFiles()
    {
        $this->_model->read('adminhtml');
    }
}