http://www.toocoolmotorcycleschool.com is where I went a couple of years ago -- great experience. I can't say enough good about the quality of the instruction, and the great number of different types of bikes they had for us to ride and practice on; everything from 250 and 600cc sport bikes to 500cc standards to various crusiers. I actually went in thinking a crusier would be my bike of choice, and came away wanting a standard/naked type.
I've been racking up the miles on my wife's Can-Am Spyder the past two years, but this is my planned purchase for myself:
Anyhow, they indeed let us use their bikes for the test. The examiner follows behind in a car and gives you instructions over a one-way radio head set.
The test was a snap after the course, which as others have said was a lot of mental and physical work. Prior to training, I don't think I would have passed as one of the big things they look for is a 'quiet, controlled confidence' on the bike the examiner told me. The course gave me that in spades.