Great idea! This could really help for finding out enemy strategies. This idea could be tweaked a bit.. Such as, you have to use a special item (scanner) to add enemies to the test chamber. Still love it!
Anybody else reminded of the Danger Room from X-Men? I definitely think this should exist. Also, along with the hologram battle idea, you should get some sort of grade based on your combat performance, like A, B, C, etc.