Rails: Unit Testing Update

In the past I've written about unit testing Rails applications and specifically ActiveRecord::Base unit tests. On this topic, I have friends that range from interested to skeptical and probably worse. Since I expect the readers of this blog to fit somewhere in the same range, I thought it might be valuable to post the following stats from my current project. The following is a cleaned up version of our build output.

[Unit Tests]
Finished in 6.115697 seconds.
983 tests, 1600 assertions, 0 failures, 0 errors

[Drop and Create 3 databases]

[Functional Tests]
Finished in 5.746835 seconds.
281 tests, 542 assertions, 0 failures, 0 errors

[Integration Tests]
Finished in 0.945832 seconds.
6 tests, 15 assertions, 0 failures, 0 errors

4 months into the project, with 16 developers, and our build still runs (including dropping and creating 2 postgres databases and 1 mysql db) in less than 50 seconds.