( and it's simple, quick and positive (or negative if you see what I mean).
Take a glass and pour a decent dram of your favorite whisky into it; then see if you can smell it. If you can, then you are halfway there.
Then drink it. If you can taste it then it is reasonable to assume you are currently free of the virus because the loss of the sense of smell and taste is a common symptom.
I tested myself 7 times last night and was virus free every time, thank goodness.
I will have to test myself again today because I have developed a throbbing headache which can also be one of the symptoms.
I'll keep you posted.