This is how I understood it, when women 'shit test' a man it is to see if he is an alpha or not. It is an absolutely toxic mindset which will lead to weird dudes interpreting absolutely normal behavior ("hey Bob, it is your turn to do the dishes as agreed" "No Sarah! I will not do the dishes, you do it you ") as shit tests. When men do the shit test it is to show how alpha and not constrained by social conventions they are. or something like that. To show the value of their genes to the women.

But yeah, it is pretty bad that the LW-community has taken up these kinds of terms.

(Edit: changed the wording a bit here, for some reason I started my first sentence different than I wanted to start it, my bad, I meant to explain how the concept is gendered (at least from how I got it, and yes pua stuff is very hetro), no idea why I messed up the start).