Yes, I've used Cedar successfully myself on other OSX projects. The only difference I can think of is that this particular project is a cmd-line tool (at the moment, but will soon turn into a framework). I used the Cedar Spec Suite template for OSX. This created the pch, example spec, etc for me.
Anyway, for unrelated reasons I ended up using just OCUnit on this one:
a) I want it to build without dependencies.
b) I'm waiting for better Cedar support in AppCode . .
If it happens again on the next project I'll let you know.
Happy holidays!