Fix ETag tests.
Fix ETag tests.

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