Reportedly about 50% of people who get infected show no symptoms at all.
That makes them dangerously unaware spreaders—(for how many days is still a research question.)
BUT THEN (14 days?) they become immune.
So...
Ideally the test would show: 1) they had the virus; 2) they now are no longer infectious; 3) they now are immune to further infection.
...
It would reveal mechanisms of the pandemic in important detail.
It would indicate to what extent “herd immunity” is developing— and how it develops.
And...
They can help people who are still vulnerable more intimately.
Caveats...
Or it works, but there’s no way to reliably certify the result—so some people can fake that they’re immune.
Work through all that.
Comments welcome.