If you need him to prove his love; either he's doing something wrong or you aren't very confident. Try talking to him and ask him to show his love more.
You have your test right there. If you think you need to test your man to prove his love, then you already know things aren't right. I'd start thinking about moving on.
You may pretend to be ill and look at his reactions, is he worried? is he capable of what to do? then you can judge whether he loves you.Or you decide based on sexual activity.If you feel good, he does.