/** * @afterClass */ public static function tearDownAfterClass(): void { \OC_Util::tearDownFS(); }In this example, the tearDownAfterClass method is executed after all tests in a class have been completed. The tearDownFS method is called to clean up the file system used for testing. This method is part of the ownCloud core library, which is a PHP package for building file sharing and collaboration platforms. It is used in combination with PHPUnit, a popular testing framework for PHP. Overall, the tearDownFS function is a useful method for ensuring that test environments remain clean and efficient, while also helping to prevent the creation of excess storage.