I ran into the same need on our team. My solution was to just pick up an RC servo tester. HobbyKing carries a bunch of them:
http://hobbyking.com/hobbyking/store...h=servo+tester
These will cable right to the speed controller via the PWM port. I just got a cheap one and powered it via a 3S lipo and a UBEC that I had laying around, but some of the better ones have more power options.