While I agree that there should be a way to test your techniques, I would caution against having people in the dojo resist techniques unless they really know what they are doing. I say this because I have resisted before. (It hurt a lot and I will try to never do it again.) I also was once sparring/playing (depends how you look at it I guess) with a friend who studies TKD. He resisted my kote gaeshi and really got hurt. The technique still worked, but I felt awful.
My two cents.