I've been playing with Symfony's testing methods. They give you the results in the command line (for instance, green text is for OK and red text is for NOT OK). It also tells you the cause of the error.
Is there something similar to this in CodeIgniter and CakePHP?
The best tool out there that I've seen for codeigniter is a library for SimpleTest see http://codeigniter.com/wiki/SimpleTester_-_Unit_testing_library/