Add test for UnresolvedModule.ResolveAll.
Add test for UnresolvedModule.ResolveAll.

BluewireTechnologies/cassette,andrewdavey/cassette,andrewdavey/knapsack,andrewdavey/knapsack,honestegg/cassette,damiensawyer/cassette,honestegg/cassette,honestegg/cassette,andrewdavey/cassette,andrewdavey/cassette,BluewireTechnologies/cassette,andrewdavey/knapsack,damiensawyer/cassette,damiensawyer/cassette