I upgraded a pet project to 3.0rc today. I found that not having a default config for the test environment generates some pretty strange errors. Specifically, the test suite (and Rails) initializes fine, and only throws errors when you try to save models. I think it's reasonable to at least include a sample test config since not having one can prevent you from getting up and running quickly. It's reasonable not to have a production config since that would require work anyways to specify the server info.