When you press "test" you are like activating the system, nothing compared to just arming the floats, the only thing that could prevent the inflation is that the guard is down.
Same thing as in the hoist, try to do a "test" while the guard is up... no, don't do it, others already have done it...
So you are comparing to be flying with floats armed, with to fly while continuously sending a signal to wires...
Regards
Aser