I looked around various sites and by recommendation narrowed the number of candidates down to UnitKit and OCUnit. OCUnit seems to be far more popular and we even have a test helping framework called OCMock that is at least related by name.
Both Kits work pretty much the same, but I chose UnitKit because
- failed tests are warnings not errors
- more convenient macros, that make test writing even less typework
- very nice looking user guide included