Test for humankind as a whole? You mean he tested how long on average it took for a human to drown, or did he just want to see who would survive the longest? Did the strongest guy at least receive a prize?
I think we are discussing past each others here. You're arguing that how the story came to be and how it is interpreted can make perfect sense given the context while others are pointing out that the story makes no sense if you interprete it the way creationnists do. It's not even clear to me that those two propositions are contradictory (btw ignore my previous post, it was just a lame attempt at humor but somehow I never manage to be funny on the net).