We are the chorus, and we agree, we agree.
Why can’t you just put it in your radio or whatever and see if it works? Why do you need to test it first? I have never heard of doing such a thing but we always had a battery tester/charger as far back as I can remember.
If you do not have a battery tester or a voltmeter at hand, and you don’t know if the radio or whatever is broke, it is the last resort of how to test the battery.
Moses and Aaron on a stick!
Nope. I’ve always been too chicken to even lick a double A.
Like Notorious B.I.G.? 
I’m with the “why would you test it THAT way?” crowd. If it doesn’t work in the radio, test it on something that is currently working fine. (And who “checks” batteries anyway? Buy new ones, put them in - doesn’t work? Broken; save the batteries for something else.)
I think you’d have to have a hell of a tongue to make that do anything.
Never heard of it. I have a thing called a “battery tester” that lets me know if the battery is good. It works on 9V just fine.