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J. Nick Koston
9ed16b63a3
Persist the result of pytest --collect-only between CI runs as a JSON file keyed by content hash, so unchanged test files are served from cache and only edited or new files are re-collected. The cache is self-healing: * Missing, corrupt, or wrong-version files fall back to a full collect. * Any conftest.py change anywhere under the test root invalidates the whole cache, so fixture parametrization shifts cannot silently skew counts. * Files pytest returns nothing for (helper modules named test_*.py with no test functions) are cached as zero so they don't get re-collected forever. Walking is done once with os.walk (~2x faster than Path.rglob) and collects test files plus conftests in a single pass. When the cache is fully cold we feed pytest top-level directories rather than thousands of file paths so cold runs stay as fast as before the cache landed. Wire the new --cache flag through the prepare-pytest-full job and back the cache file with actions/cache so PRs can pick up the latest dev snapshot via restore-keys. Local timings: cold 11s, warm with no diff 0.4s, warm with one file edited 2.3s.