chore(tests): cleanup bootstrap.php to be forward-compatible

Signed-off-by: Richard Steinmetz <[email protected]>

Author: st3iny

tests/php/unit/bootstrap.php

@@ -1,17 +1,23 @@
 <?php
 
+declare(strict_types=1);
+
 /**
  * SPDX-FileCopyrightText: 2019 Nextcloud GmbH and Nextcloud contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
+
 if (!defined('PHPUNIT_RUN')) {
 	define('PHPUNIT_RUN', 1);
 }
 
-require_once __DIR__ . '/../../../../../lib/base.php';
+use OCP\App\IAppManager;
+use OCP\Server;
 
-\OC::$composerAutoloader->addPsr4('Test\\', OC::$SERVERROOT . '/tests/lib/', true);
+require_once __DIR__ . '/../../../../../lib/base.php';
+require_once __DIR__ . '/../../../../../tests/autoload.php';
+require_once __DIR__ . '/../../../vendor/autoload.php';
 
-\OC_App::loadApp('calendar');
+Server::get(IAppManager::class)->loadApp('calendar');
 
 OC_Hook::clear();