Side thread: do you have suggestions for "validation testing" when it comes to gameplay -- not playability or fun factor, but more ... objective and mathematica

Side thread: do you have suggestions for "validation testing" when it comes to gameplay -- not playability or fun factor, but more ... objective and mathematical? I'd like to "lint" the game, so to speak, as a formalized system in various states and I'm curious about how that is done in game dev