Yes, but we are talking about morality
Objective morality means that something is always either right or wrong, there is no middle ground or opinion involved. So you don't test for it, in that sense.
When we do tests in regards to everyday things or science, it's because we don't know how they work. So we have a hypothesis we test it and at some point if everything goes well we end up with a scientific theory, that is objectively true of how a given thing works, which again is not something we have opinions about. Like saying "I don't really feel like Einstein was right, I think it would be better if we remove the E from the equation." Either its true or it isn't