So God is incapable of issuing challenges on his own? He's incapable of properly engineering a being, and then debugging his own design? He needs someone else to torment and torture his beloved creations to tease out flaws?
While I'm ok with some animal testing, done for things like live-saving medicines, well, we humans don't have "all-knowing" on our resumes. The Christian god does. I'd expect even just a reasonably-advanced alien race to be capable of creating a simulation which would show how a human brain would react to any given situation. Certainly an all-knowing, all-powerful entity would be able to just give the scenario an idle thought, and arrive at a conclusion, all without the torture and such inflicted by one of his out-of-control creations.