Testing is not a thing in the iOS and Mac community and that sucks.
github.com
github.com
Seems like an overreaction and over-generalization. Maybe it's a reaction to the fact that the author writes no unit tests? Such statements can be made about anything. How about "Coding style is not a thing in the iOS and mac community".
Anyway, most Mac based code bases I have worked with have lots of unit tests.
Maybe more important than testing, I think support for writing libraries is really lacking. I know cocoapods is working on this but it would be amazing if we had something as easy as npm in iOS land. Any time I notice I'm doing something in one app that would be useful somewhere else, it's really quick to package the module up in an npm module. With obj-c stuff I usually just copy/paste :).
TDD is more often than not a waste of time.