final List<List<Member>> arrayList = new ArrayList<List<Member>>();
TupleList fm = new DelegatingTupleList(2, arrayList);
fm.addTuple(genderFMember, storeUsaMember);
fm.addTuple(genderMMember, storeUsaMember);
assertEquals(2, fm.size());
assertEquals(2, fm.getArity());
assertEquals(
"[[[Gender].[F], [Store].[USA]], [[Gender].[M], [Store].[USA]]]",