Jim Joyce wrote

This is how you test an electric fence.
https://imgur.com/gallery/fvth9KJ

Nope, you do it with a long grass stalk, hold it in
one hand, put the free end on the wire, at the end
furthest away from the hand holding it and then run
the stalk closer to the wire until you can feel it firing.
https://www.youtube.com/watch?v=dTCkOiMivkk

And no, you don't urinate on it, although there
are no guarantees as to what happened next.

There is if you do it the right way.