pojo = toBytesAndBack(pojo);
assertEquals("yar", pojo.getVal());
assertEquals(1, pojo.getFlights().size());
Flight flight2 = new Flight();
flight2.setName("not harry");
pojo.addFlight(flight2);
beginTxn();
pojo = pm.makePersistent(pojo);
commitTxn();
Entity e = ds.get(KeyFactory.stringToKey(flight2.getId()));
assertEquals(KeyFactory.stringToKey(pojo.getId()), e.getKey().getParent());