The app tests in spec/integration/app_spec.rb are rather sparse. I suggest to add:

1. A "canonical flow" such as controller actions that create, update, read, and delete a model, and tests that verify the action happened in the database.

This is not urgent, but would suggest someone look at this when bandwidth allows. I think we can all agree we should have basic end-to-end tests which cover Mongoid "as used in the real world."