Here's the first part of a multi-part iPhone Unit Testing Series. (Updated 3/31/12 with Xcode 4 testing) For the second part of iPhone Unit Testing Explain - Part II How comfortable are you on a bike without a helmet? Writing code without tests is like riding a bike without a helmet. You might feel free and indestructible for now, but one day you'll fall and it's going to hurt. I can't start a new