OCUnit is the standard unit testing framework that is built into current versions of XCode. The OCUnit SDK is called SenTestingKit, which is a little confusing, but whatever. The biggest drawback to using OCUnit (or SenTestingKit) is you cannot get a call stack (i.e. back trace) when tests fail.
Hey Call Stack
Getting a hold of the NSException object is key to printing the call stack. After a bit of poking around in the headers, I found a notification called SenTestCaseDidFailNotification, which gives you an array of NSExceptions that occurred during test failure.
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OCUnit is a bit obscure, but it’s integration into XCode makes it very fast to use—the ⌘U shortcut in XCode is fantastic. This is about the only advantage over GHUnit (another great testing framework), and it is the biggest reason I keep using it.
OCUnit is open-source, and I’ve put this on my list of “code to read”.