The Lame Kind of TDD

Except you wouldn't repeat every single manual test every time you make a material change to the code. And that means you'll miss cascade failures, one of the biggest benefits of automated testing.

Michael is trying to instil good habits in newcomers to the Ruby and Rails worlds, rather than show off perfectly chosen situations to evangelize TDD. But, rest assured, if you go much deeper with Ruby or Rails, this habit will start to reap huge dividends.

There's certainly an argument for not testing every minor piece of rendering to occur in an app (like constantly checking for content on requested pages) but that's really a different debate than to-TDD-or-not-to-TDD.