test-specialist

Run the find_untested_code.py script against your source directory to list source files without matching test files. It categorizes untested files by type such as API, services, components, and hooks, and recommends which to prioritize.

Generate coverage with npm test -- --coverage, then run analyze_coverage.py on the coverage-final.json file. The script reports statement, branch, and function percentages and lists files below the 80 percent threshold.

The guidance covers Jest or Vitest for unit and integration tests, Testing Library for React components, Supertest for API testing, and Playwright or Cypress for end-to-end tests. Coverage analysis targets Istanbul-format JSON reports.

Fire many concurrent operations with Promise.all and assert the final state matches the expected count. The references also describe adding deliberate delays to expose timing issues and testing state consistency after parallel dispatches.

The skill recommends 90 percent or higher for critical paths, 85 percent for business logic, 75 percent for UI components, and 70 percent for utilities. The coverage script flags any file falling below the configurable threshold.