The only real and reliable test should be for the presence or absence of COVID-19 Wuhan virus antibodies circulating in the blood serum. If the antibodies are present, no injection is necessary or even desirable, and in fact would be contraindicated, based on the very real science behind immunology.
If the given antibodies are not present, then the presence of adequate levels of zinc ion as Zn++, and the presence of adequate amounts of Vitamin D3 or other suitable zinc ionophore circulating in the blood stream should serve as ample evidence the individual is probably able to resist any COVID-19 virus infection, and is highly unlikely to contract or spread the virus.
Then and only then would immunization using the mRNA vaccine have even marginal value in preventing a new infection, and that is by itself rather spotty and subject to a great deal of the element of chance.
Fresh air and sunshine work wonders to kill off the COVID-19 Wuhan virus particles. In the absence of that natural method, the effects of UV-C light and ozone also do an excellent job of deactivation of the virus particles.
And not just COVID-19 virus, either.
I suspected that I had COVID in Jan/Feb of 2020. Over a year after the fact I wanted a test for the antibodies. I was told by my doctor that after a certain amount of time, the anti-bodies for any virus you've had will not show up on a test. It doesn't effect immunity, it just doesn't show up.