Developer website: Tim Hart
TestKit from ThoughtWorks is a testing framework for Mac OS X and the Objective-C language. Modeled after JUnit, it allows Mac OS X developers working in the Cocoa environment to write unit tests against Objective-C objects and features both command-line and graphical test running tools.
New in 0.9.4 is an updated TestRunner, XCode Integration, and a mock objects API.
Mac OS X 10.2 or later, Apple Developer Tools installed.