Fix fine-grained deps in diff-cache.py tool + add test#20837
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The diff was calculated the wrong way around.
ilevkivskyi
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Feb 17, 2026
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ilevkivskyi
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ilevkivskyi
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Oh wow, this is a nasty bug. Yeah, having basic tests sounds good, thanks!
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
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The delta was calculated the wrong way.
Add a basic integration test for cache diffing and applying the diff. It only uses the fixed-format cache and sqlite caches, as these are expected to be the long-term defaults. The cache diff tests are pretty expensive to run, so we only have one test for now.
I used a coding agent to write the test in multiple reviewed increments.