Artist childDeleted = (Artist) objects.get(2);
childContext.deleteObjects(childDeleted);
childDeleted.setArtistName("DDD");
Artist childHollow = (Artist) objects.get(3);
childContext.invalidateObjects(childHollow);
childContext.commitChanges();
assertEquals(PersistenceState.COMMITTED, childNew.getPersistenceState());
assertEquals(PersistenceState.COMMITTED, childModified.getPersistenceState());