I also wonder if this is written from a statically-typed perspective. In dynamic-typing land there are so many more stupid little things that can break that the compiler would otherwise catch for you

Either that or tracing/logging/debugging, but other than specific niches like parsing (of specific bug repros) I think integration tests are generally a lot more bang for the buck.

Anyway, if you want to go down a related-but-unrelated rabbit hole, J.R. Thompson's lecture on the Space Shuttle Main Engines is a good one. You can probably watch it at higher speed to smooth out the many, many "uh"s (believe me, it's bad):

Integrated testing: https://youtu.be/uow6v1EuybE?t=1292

Test to failure: https://youtu.be/uow6v1EuybE?t=3135

https://ocw.mit.edu/courses/16-885j-aircraft-systems-enginee...

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There's this more-modern link but in true modern fashion you can't really link to specific things presumably because it's all javascript muck: https://openlearninglibrary.mit.edu/courses/course-v1:MITx+1...