Python Testing Strategies — Quick Reference

Setup (CRITICAL)

Set asyncio_mode = "auto" in pyproject.toml to auto-detect async tests without markers. (The default "strict" mode also works if you mark tests with @pytest.mark.asyncio.)

See examples.md for the complete conftest.py and pyproject.toml setup.

Test Client

Use httpx.AsyncClient + ASGITransport — never TestClient for async tests.

See examples.md for client fixture setup.

Required Coverage Per Endpoint