“I have been writing tests around my iPhone apps’ view controllers in order to follow the same TDD practices we use in other environments. Writing tests first has changed the way I structure my code in a couple of ways which I think offer immediate and emergent benefits for my applications. Most of an iPhone application’s business logic is implemented in its view controllers. Testing those controllers is therefore a priority if I want to have a well tested application.
Below are some examples of the sort of tests I have written for my view controllers using GTM, Hamcrest, and OCMock (our iPhone Unit Testing Toolkit). Hopefully this can serve as a starting point for the tests you could be writing for your own projects.