String result = purgeThumbnailJob.execute();

        assertTrue(result.contains("Purge failed"));
    }

    // Test execute with exception thrown (no message)
    public void test_execute_exceptionThrownNoMessage() {
        thumbnailManager.setThrowException(true);
        thumbnailManager.setExceptionMessage(null);

        String result = purgeThumbnailJob.execute();