@Test
public void testChangedSince() {

    boolean changed = PersistenceExtensions.changedSince(item,
            ZonedDateTime.of(1940, 1, 1, 0, 0, 0, 0, ZoneId.systemDefault()), TestPersistenceService.ID);
    assertFalse(changed);
    changed = PersistenceExtensions.changedSince(item,
            ZonedDateTime.of(2005, 1, 1, 0, 0, 0, 0, ZoneId.systemDefault()), TestPersistenceService.ID);
    assertTrue(changed);
    // default persistence service
    changed = PersistenceExtensions.changedSince(item,
            ZonedDateTime.of(2005, 1, 1, 0, 0, 0, 0, ZoneId.systemDefault()));
    assertFalse(changed);
}