what kind of license do you need/get for a yamaha tricity?

A motorbike license will do.

how do you test with a tricity.

raised cement area?

^ lol rodknock ...be a bit tricky that one, its a bit narrow but maybe just doable. Suggest you borrow a honda wave or similar ....power up and use rear brake as other posters have advised. Note: not on a click or scoopy etc. as harder to be being fully automatic. Oh and not on the Benelli eh, big thing it is lol ....good luck mate.