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Each commit is pretty independent
The improvements to failure detection in interpreter tests all revolve around trying to pick up on some internal task dying instead of just hanging forever. Since the interpreter and image fetching/decoding is all run in separate threads from the test any panic in those threads cause the test to hang. The thread panicking will still get captured and printed which is nice for easily debugging failures. All we needed to do was have conditions in place, so that the main test thread knows when to die appropriately
The other commit was just moving the existing YAML frontmatter test to join the other interpreter tests since it tests through even more code for free1
Footnotes
well... more or less ↩