Coverage data file under pytest cache
Skill kjuhwa/skills-hub/skills/build/coverage-data-file-under-pytest-cache
Self-correcting knowledge corpus for Claude Code — 9 stable shape clusters, bias-correction pipeline baked into contribution flow. 47 papers, 45 techniques, 1.1k skills.
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Move coverage data files into .pytest_cache/.coverage so pytest-xdist worker fragments (.coverage.<host>.<pid>.<random>) end up inside the already-gitignored cache dir instead of polluting the repo root.
SKILL.md
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Coverage Data File Under .pytest_cache
When to use
You run tests with pytest -n auto --cov and end up with dozens of .coverage.<hostname>.<pid>.<random> files at the repo root. They look like garbage, accidentally get committed, and clutter git status. There's a one-line fix.
How it works
Set tool.coverage.run.data_file to a path inside .pytest_cache/. pytest-xdist appends host/pid/random suffixes to whatever you set, so all the fragments land inside the already-gitignored cache directory.
Example
[tool.coverage.run]
# With pytest-xdist (-n auto), each worker writes a fragment; put them under
# .pytest_cache/ (already gitignored) instead of .coverage.<hostname>.* at repo root.
data_file = ".pytest_cache/.coverage"
Combine with a Makefile clean target that explicitly nukes leftovers from older runs:
clean:
find . -maxdepth 1 \( -name '.coverage' -o -name '.coverage.*' \) -delete 2>/dev/null || true
Gotchas
.pytest_cache/is gitignored by default in most Python templates; verify yours has it.- If you use
coverage combineseparately (e.g. in CI to merge fragments from parallel jobs), point its input/output paths at the same.pytest_cache/.coveragelocation. - Doesn't change behaviour for single-worker
pytest --cov— it just keeps the folder tidy.