All our tests are taken individually, we don't do group tests.
You are tested on all the material you are supposed to know (forms, techs, sets, basics, etc.) both on a person and in the air.
At orange belt tests and above you are given spontaneous attacks to react against.
At blue and above you start being graded on your teaching ability, and your ability to break down forms and techniques.
At brown you are quized on your knowledge of kenpo history, analysis of the system, etc all categorized into a catch-all "other category."
At black there is a requirement for full (well, almost) contact sparring.
Needless to say all of these are cumulative, my black belt test was 5 hours long, but that is because either A) I screwed up alot and had to show and explain everything I was doing or B) I talked way too much on the "other" category. (I tend toward the latter, my board was grumbling about missing lunch when they were walking out the door.)
Lamont