I tried using Testee as my test framework but found that SimpleTest but the latest release of SimpleTest was in 2010 so I'm presuming that it is no longer supported which is probably why Stephen Lewis hasn't updated Testee for 10 months.
Basically, I can't get this working and because it is unsupported I guess that it would be better to find out what other folks are doing.
I was thinking of Forking the Codeigniter tests and extending them in some way. Is this what others are doing?