Debugging Unit Tests for the iPhone/iPad

I have been working my way through a new iPhone app. I have been doing this TDD. One problem that I ran into was one of my tests failed, yet I could not figure out how to get it working easily so I wanted to debug my Unit Tests. This should be straight forward, yet it took me a while to figure out using the metaphors and tools of XCode (built in OCTest). I know that many people will say I should