No probs - I only know 'cause i've deliberatley tried it to see what happens!!!
My advice is to take it somewhere wide open without people, buildings or tall trees (ie where you know it's going to be fairly safe to do the following) and deliberatley do things like shutting down the app, pulling the usb lead, turning off the RC, running the battery to critical power etc to see what happens (having set the correct safety heights, distances and rth behaviours beforehand off course!!!) - basically, try it out, see what happens and work out how you'll respond to it when it does happen for real! That way, you don't panic as much and you'll be less likely to make mistakes that will compoud the problem when it happens.
The only instance that you'll potentially have problems with the aircraft not stopping and hovering should be if you're flying in ATTI mode - then it'll attempt to hover, but will simply drift with the wind as the gps hold won't be on.