Tests show what we are truly made of. On a battlefield, one finds out whether he is brave or timid. In court, some will lie and others won't. And there are ones who can be bought with money if the offer is right. I can easily think of a situation for each of the Ten Commandments in which one may fail to obey. Christ is a test for us because he challenges us. Basically, our response to him exposes whether he is more important than us or not.