This `TestGroup` class looks similar to [that in `PersonAttributesGroupStore`](https://github.com/shawnconnolly/uPortal/blob/UP-4030/uportal-war/src/main/java/org/jasig/portal/groups/pags/PersonAttributesGroupStore.java#L420).  Opportunity to promote to a real public class and re-use across this `EntityPersonAttributesGroupStore` and the original `PersonAttributesGroupStore`?