And the method unit tests are frequently found as a one line comment of the method that you just select and "inspect it" or "debug it".
OTOH, I don't do a lot of SUnit testing (should probably do more) because its a drag to go make the subclass and build the methods and write the asserts, etc.
One day, there will be some nifty tool that will take these comments and make them into proper SUnit classes. But not today.
OTOH, I really like coding in the debugger.