I have been having trouble with the existing tests. It seems to me that most people that know what they are doing consider the thumb pad test (TPT) to be the most accurate.
I don't have the sensitivity in my thumb developed well enough to be able to tell one edge from another. (well beyond a certain point anyway)

I got to thinking about different ways to check for a good bevel. Here's what I came up with (this is gonna sound strange, but trust me...) Tonight I tried checking the bevel on various razors by pressing the edge against the tip of my tongue. (no they didn't cut in)
Why do toddlers constantly put things in their mouths? Because the tongue has more nerve endings per square inch than any other part of the body (with the possible exception of the sex organs, but I am NOT gonna by the first one to try the HPT... )
Anyhow... There are far more nerve endings on the tongue than there are on the thumb. A razor that feels sharp to me by using the TPT feels like a butterknife on my tongue. It is very easy for me to tell the difference from one to another this way. I can even tell which of my shave-ready razors has the best edge on it.

Ok. So it works for me. Let the comments begin...