pytest

Comprehensive pytest testing skill for Python projects with specialized FastAPI support. Use when: (1) User wants to generate test files for existing code, (2) User asks about pytest patterns, best practices, fixtures, or test organization, (3) User is working with FastAPI testing (TestClient, async tests, dependency overrides, authentication), (4) User needs help writing tests, configuring pytest, or organizing test suites. Includes test generation script, FastAPI-specific patterns, fixture templates, and comprehensive pytest reference documentation.