# Pytest Documentation Notes

Primary references used:
- https://docs.pytest.org/en/stable/explanation/goodpractices.html
- https://docs.pytest.org/en/stable/how-to/fixtures.html
- https://docs.pytest.org/en/stable/example/markers.html
- https://docs.pytest.org/en/stable/reference/customize.html
- https://docs.pytest.org/en/stable/explanation/flaky.html

## Agent Quick Path
Use this file when you need fast pytest scaffolding defaults without framework-specific details.

1. Mirror source layout under `tests/`.
2. Keep fixtures small and explicit; default to `function` scope.
3. Register markers up front in `pyproject.toml`.
4. Validate structure first with `uv run pytest --collect-only -q`.
5. Run fast lane with `uv run pytest -m unit -q`.

Load other references only when needed:
- FastAPI routes/dependency injection/lifespan: `fastapi-testing.md`
- SQLAlchemy sessions/transactions/DB fixtures: `sqlalchemy-testing.md`

## Practical Guidance For This Skill
- Use src-aligned test layout and keep test discovery conventional.
- Keep fixtures small, composable, and explicit; use `yield` for teardown.
- Register custom markers and keep strict marker validation on.
- Separate quick unit runs from slower integration/external runs.
- Minimize flakiness by controlling shared state and avoiding hidden dependencies.
- Use `--collect-only` and marker-filtered runs to validate scaffold quality early.

## Commands Worth Remembering
- `uv run pytest --collect-only -q`
- `uv run pytest -m unit -q`
- `uv run pytest -m "not external" -q`
- `uv run pytest -q`