Missing methods, resilient software and failing gracefully: https://ovid.github.io/articles/alan-kay-and-missing-messages-a-follow-up.html
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I'm still experimenting with UIs for live (sandboxed) evaluation of tests. I've realised that you really want to highlight the failing assertion, not just the failing test.
Feedback welcome :)
Learning software development through playing and contributing to a MUD: https://tashian.com/articles/how-i-learned-to-program/
Do any tech streamers try new software live? It'd be a really fun way of doing UX testing.