This is a comprehensive testing skill that covers the full pyramid from unit tests through E2E, with solid examples across JavaScript, Python, Go, and Java. It includes proper mocking patterns, parametrized tests, and async handling. The TDD/BDD focus is clear, and it restricts tool usage to relevant test runners like Jest, Vitest, Pytest, and framework-specific commands. Best for when you need Claude to write or review test suites with proper structure, not just generate quick assertions. The emphasis on the test pyramid and coverage goals (80-90% for units, critical paths for integration) shows practical judgment rather than chasing 100% coverage.
npx skills add https://github.com/personamanagmentlayer/pcl --skill testing-expert