That is so strange. Apparently it is considered a motorcycle because it has 3 wheels, so the motorcycle test can be taken on them (if it stays in the lines, which I doubt), but a motorcycle license is not required for 3 wheeled vehicles..
California issues the following license classes for two-wheel vehicle
• Class M1—You may operate
any two-wheel motorcycle,
motor-driven cycle, or motorized
scooter and all vehicles listed
under Class M2.