Ash Furrow, over five years ago, in Seven Deadly Sins of Modern Objective-C:
Do you unit test your Objective-C? No, you probably don’t. Do you have automated UI acceptance tests for your UI? Nope. Do you have any kind of continuous integration set up? No, you don’t.
I don’t understand what is wrong with the Objective-C community that it continuously eschews any form of automated testing. It’s a serious, systemic problem.
This is still a serious, systemic problem in the iOS world. It’s the biggest mistake I see new iOS developers make, but it’s not just new developers — it’s most of us, most of the time. When so many respected developers say it’s worth the effort, why are we still not doing it?