No experiment that you willingly partake in can honestly test your will. Think about something really awful happening to you, and then think about how you'd go about handling it. Could you have the will to live through total paralysis? What about loosing your parents in an accident? Life in jail? Sometimes you just don't know if you would be able to preserver unless you're tested by forces beyond your control - everything else you do is just practice. Have a little faith in yourself, tease out your weaknesses and explore them in depth in the meantime.