Test Driven Design for iPhone Native apps
I don’t know much about Ruby or binary protocols, but if You’re interested in unit testing on iPhone, You might want to check out the Google Toolbox for Mac. I am having great success testing my OpenGL ES application with it.
Cliff, long term you're best investing time in pure ObjC TDD tools. I have used my own rbiphonetest lib in fmdb-migration-manager successfully, but its usefulness is probably limited to libraries etc. Even then there will undoubtly be enough 'works in Cocoa but fails in UIKit' scenarios to make rbiphonetest dubious to use. Hopefully one day RubyCocoa can be built against the Intel UIKit libraries and then it will be very useful and sturdy I think.