I disagree with that. I remember a question about a 'switch-finder' wiring diagram.The official tests are always more sensible.
The first question seems to be about folks who have called us all too many times about "that one outlet that isn't working for my computer"...or "has never worked for as long as I've lived here". I've shown that wall switch "trick" dozens of times to folks, some even who were getting their home ready for sale (so they never used it as long as they lived there).![]()