// Test value was not changed
        assertEquals(originalExpiry, purgeThumbnailJob.getExpiry());
    }

    // Test expiry setter with negative value (should not change)
    public void test_expiry_negativeValue() {
        long originalExpiry = purgeThumbnailJob.getExpiry();
        PurgeThumbnailJob result = purgeThumbnailJob.expiry(-1000L);

        // Test method chaining
        assertSame(purgeThumbnailJob, result);