assertEquals("Deleted " + Long.MAX_VALUE + " thumbnail files.", result);
    }

    // Test method chaining with multiple expiry calls
    @Test
    public void test_expiryChaining() {
        PurgeThumbnailJob result = purgeThumbnailJob.expiry(1000L)
                .expiry(2000L)
                .expiry(0) // Should not change
                .expiry(3000L);