thumbnailManager.setPurgeCallCount(1);

        String result = purgeThumbnailJob.execute();

        assertEquals("Deleted 1 thumbnail files.", result);
    }

    // Test execute with successful purge (multiple files deleted)
    public void test_execute_multipleFilesDeleted() {
        thumbnailManager.setPurgeCallCount(100);

        String result = purgeThumbnailJob.execute();