Add test case for room found by id
Add test case for room found by id

* I don't love that the Room interface and database leak into this test,
  but it feels desirable to get the case under test. If we decide to
  extract an interface such as `find_or_initialize_by_id` for this
  little bit of behavior, we can test that interface in isolation and
  not worry about it in the context of the Source spec.

litaio/lita,brodock/lita,litaio/lita,brodock/lita,jimmycuadra/lita,tristaneuan/lita,tristaneuan/lita,jimmycuadra/lita