A paper clip works fine - the concern is if it gets bumped and one of the paper clip ends falls out of one the spade terminals you stuck it into, or if the paper clip touches a piece of grounded metal in your stove, it can ground out / short out either a stove component, or you if you grab it to reconnect it ! 'Defibrillating' yourself, or your stoves control board, w/ 110v is never a good thing !.
Wrapping the paper clip and the spade terminals you're connecting to with electrical tape prevents this. I use an insulated alligator clip jumper like FF mentioned, and even those I wrap at the alligator clip / spade terminal connection with electrical tape *just in case* I bump the jumper wire, so it doesn't separate. Call me paranoid but............safety first, for me first, then for my stove and its $$$$$ control board!
Any smallish gauge wire will work, 22 or 24 AWG insulated copper wire, something about the size of the wires you're jumping is good. You can just strip a little insulation off the wire ends, leaving the insulation in the middle of the wire, and stick the stripped wire into the spade terminals, then wrap them with electrical tape to secure them and keep from grounding out. But if you do enough electrical trouble shooting it's worth it to have a couple pre-fab ones.