Even that test has limits though. Competive gamers all start off playing hours of video games a day, but playing competitively means sacrificing fun for grueling practice, formulaic tactics and very little experimentation; basically all the fun is sucked out of it.

Theres a moment in the show "Silicon valley" when a programmer looks at an Agile deliverables chart and says "This just became a job".

I think that would be the test. Can you endure the drudgery of daily grind and constant challenges and still want to go through with it? You won't know unless you try.