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The motivation for introducing a new test generator is that CxxTest cannot be used with tests that (indirectly) schedule code to run in the main queue.
There are a few other advantages of breaking with CxxTest:
1. Less boilerplate: A test file need only contain a
function named with a ‘test_’ prefix. No classes,
inheritance, or similar. If you need fixtures, use the
multitude of ways that C/C++ allows that (constructor
functions or non-POD types with static storage).
2. Concurrent tests: Test functions are scheduled with
‘dispatch_apply’ and will thus run concurrently. If
you need serial execution you can wrap your tests in a
block and schedule that to run in the main queue.
Though you should catch exceptions and re-throw these
in the test’s original queue, as the test assertions
are using exceptions.
3. Easier output of custom types: The assertion macros
will call ‘to_s’ on the arguments given, so the only
thing required to make these output nicely is to
provide a ‘to_s’ overload for your custom type /
enumeration. I know that the standard way to do this
is overloading operator<< for a stream, but the
TextMate code-base already uses the ‘to_s’
convention.
Long-term I can see a few other advantages, like calling preprocessor on the input files to support #if/#else/#endif to disable tests, better support for Cocoa code (NSRunLoop), and introducing test timeouts.