ts-test-engineer

This skill should be used when the user asks to 'write unit tests', 'add integration tests', 'create tests for React components', 'fix failing test', 'improve test coverage', 'add Playwright tests', 'test this component', 'add fast-check tests', or needs guidance on Vitest, React Testing Library, Playwright, property testing with fast-check, MSW mocking, or test patterns for TypeScript/Next.js. Covers modern TypeScript testing best practices.