Iron Law

NO TEST INFRASTRUCTURE WITHOUT READING THE PLAYBOOK FIRST — fixtures, markers, and coverage config have workspace-specific patterns that prevent test debt

Python Testing Patterns

Deep reference for pytest test infrastructure, fixtures, async patterns, and CI integration for Python 3.14 / FastAPI services.

When to Use

Load this skill when:

• Setting up a new test suite from scratch (conftest.py, pyproject.toml config)
• Writing parametrized tests for multiple input scenarios
• Mocking async dependencies (AsyncMock patterns)
• Testing database operations with session fixtures
• Configuring test markers (slow, integration) for selective execution
• Setting up coverage reporting gates
• Wiring GitHub Actions CI for Python tests