FYI, and very late to the game so the short version: the thing to use `let` for that'll make it click is doing things like setting up all the fixtures for "corr

FYI, and very late to the game so the short version: the thing to use `let` for that'll make it click is doing things like setting up all the fixtures for "correct" / "normal" execution, and then piecemeal overriding them in nested describe/context blocks to show what should happen in abnormal situations. Basically, "here's what normal looks like, and then here's a deviation from that". Ofc, you'll shoot yourself in the foot doing that if you let individual test files get to big, but that's a bad idea anyway sooo.