Testing Skill

Comprehensive testing guidance covering:

• TDD Workflow: Red → Green → Refactor cycle with practical examples
• Test Organization: Unit / Integration / E2E test structure
• Framework Support: pytest, Jest, JUnit5, xUnit, Google Test
• Mock Strategies: Only mock external boundaries, not internal logic
• Coverage Requirements: 80%+ with meaningful assertions

When Loaded

This skill is automatically injected when working with:

• /cc-best:dev — Implementation with tests
• tdd-guide agent — Test-driven development guidance
• build-error-resolver agent — Fixing test failures

Key Rules

1. Tests first — Write failing test before implementation
2. AAA pattern — Arrange, Act, Assert in every test
3. No shared mutable state — Each test is independent
4. Descriptive names — test_<feature>_<scenario>_<expected>