// Test value was set
        assertEquals(newExpiry, purgeThumbnailJob.getExpiry());
    }

    // Test expiry setter with zero value (should not change)
    @Test
    public void test_expiry_zeroValue() {
        long originalExpiry = purgeThumbnailJob.getExpiry();
        PurgeThumbnailJob result = purgeThumbnailJob.expiry(0);

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