use OC\Files\Filesystem; class MyTest extends \PHPUnit_Framework_TestCase { public function tearDown() { // Clean up the temporary filesystem Filesystem::tearDown(); } public function testSomething() { // Set up a temporary filesystem Filesystem::setUp(); // Do some testing... // The filesystem will be automatically cleaned up when the test is finished } }In this example, we're using the `tearDown()` method to clean up the temporary filesystem that was created in the `testSomething()` method. This ensures that the filesystem is properly cleaned up after the test is finished. The `tearDown()` method is part of the OC.Files package in the OwnCloud PHP library, which is used for working with files and directories in OwnCloud.