Python Testing Practices

Python-specific testing patterns and best practices using pytest, complementing general testing-workflow skill.

CRITICAL: UV Execution Rules

NEVER use -m flag with uv run:

# ✅ CORRECT - UV pytest execution
uv run pytest
uv run pytest -v
uv run pytest tests/unit/ -v
uv run pytest --cov=app --cov-report=html

# ❌ WRONG - Never add -m flag
# ❌ uv run -m pytest
# ❌ uv run -m pytest -v