Apple makes it notoriously hard to do any kind of testing for ObjC/Cocoa apps, especially testing the GUI [1]. My solution is to only write really tiny apps, and manually test them. I still use TDD, I just make sure the app is small enough that the regression suite can be done manually in a minute or two.
[1]: I'm aware of third party solutions like Kiwi and Cedar, but I haven't found them to make this process much more pleasant than the built-in tools. Apple is really just an overbearing mom in this case, forcing you to use the sweater she chooses, and making life difficult if you don't.
[1]: I'm aware of third party solutions like Kiwi and Cedar, but I haven't found them to make this process much more pleasant than the built-in tools. Apple is really just an overbearing mom in this case, forcing you to use the sweater she chooses, and making life difficult if you don't.