Test Specialist

**Quick judgment** Well‑designed, highly focused skill for JS/TS testing and debugging. It’s particularly strong for teams using Jest/Vitest plus Playwright/Cypress, and for workflows where systematic bug analysis and coverage improvements matter. **Strengths** - End‑to‑end coverage of testing concerns: unit, integration, E2E, security, performance, and coverage. - Concrete, idiomatic examples for Jest/Vitest, Testing Library, Playwright/Cypress, and Supertest/MSW. - Clear workflows (AAA pattern, bug‑analysis steps, coverage scripts, and a decision tree for when/how to test). **Risks / Limitations** - Opinionated toward a Node/Jest/Vitest + Playwright/Cypress ecosystem; less directly applicable to non‑JS/TS stacks. - Does not execute tests or validate coverage itself; relies on the user’s tooling being correctly configured. - Very detailed guidance may feel heavy for trivial changes or very small projects. **Recommended scenarios** - Medium‑to‑large JavaScript/TypeScript codebases where you want to raise or maintain solid test coverage. - Teams formalizing their QA process, especially around regression prevention and bug‑driven testing. - Debugging tricky, reproducible issues (race conditions, null/undefined, off‑by‑one) where a structured approach helps. - Auditing an existing JS/TS service or frontend for coverage gaps, performance edge cases, and basic security issues.