PersistentFieldChange change = new PersistentFieldChangeImpl("", "field", value);
Collection<PersistentFieldChange> changes = Arrays.asList(change);
PersistentFieldBundle bundle = new PersistentFieldBundleImpl(changes);
assertTrue(bundle.containsValue("", "field"));
assertTrue(bundle.containsValue(null, "field"));
assertSame(bundle.getValue("", "field"), value);
assertSame(bundle.getValue(null, "field"), value);