@After
  public void tearDown() throws Exception {
    if (fileStore != null) {
      fileStore.stop();
    }
    // TemporaryFolder rule handles cleanup automatically
  }
Cleans up test resources after each test.
Stops FileStore and allows TemporaryFolder to clean up files.
ambry-store/src/test/java/com/github/ambry/store/FileStoreTest.java