private PurgeThumbnailJob purgeThumbnailJob;
    private MockThumbnailManager thumbnailManager;

    @Override
    public void setUp() throws Exception {
        super.setUp();
        purgeThumbnailJob = new PurgeThumbnailJob();

        // Create a mock ThumbnailManager
        thumbnailManager = new MockThumbnailManager();

        ComponentUtil.register(thumbnailManager, "thumbnailManager");
    }