Debugging test cases

Hurray it's the middle of summer and obviously like most people I am quite focused on testing code. What? You mean that isn't a typical summer activity :D?

I've written a few tests with the CakePHP test suite now and can safely say that after you have written your first one, it's very easy to write another. One thing that is a great help but not so clear how to do is how to debug a test while you are writing it. So here are a couple of tips on the topic..