I’m looking forward to this too, since despite releasing two mid-sized Inform games that weren’t noticeably buggy[1], I’ve never actually used the “test me” feature since I’ve never been able to wrap my head around how and when to use it - the skein just feels like a lower-effort and more flexible approach.
[1] Well, modulo the bees that are all over Sting.[2]
[2] And modulo the game-breaking bug in the initial release of Sting that could lead to the player getting stuck being stung by a swarm of bees over and over until the heat death of the universe.