When to Apply: Reference when writing Node.js tests with Mocha, using Chai for BDD-style assertions, or Sinon for mocks/stubs/spies. Triggers on "Mocha", "Chai", "sinon", "mocha test".
Playbook Deep Dive (10 sections): §1 Production Configuration · §2 Testing with Chai + Sinon · §3 Advanced Sinon Patterns · §4 Async Patterns · §5 Hooks & Test Organization · §6 Custom Reporters & Plugins · §7 Express/API Testing with Supertest · §8 CI/CD Integration · §9 Debugging Table · §10 Best Practices
The agent loads from 2 on-demand reference files (advanced-patterns.md, playbook.md) containing detailed implementation guides, cloud integration patterns, debugging tables, and language-specific best practices.