/add-tests

Generate comprehensive tests for a component or API endpoint.

Create test suite with:

• Unit tests using Jest and React Testing Library (for components) or Jest (for API)
• Test file in proper location (__tests__ or .test.ts/.test.tsx)
• Test setup with necessary mocks and fixtures
• Render tests for different component states and props
• Interaction tests (clicks, form input, keyboard navigation)
• Integration tests for component with API calls
• Accessibility tests using jest-axe
• Edge case and error scenario tests
• Mock implementations for external dependencies
• Test coverage for all exported functions/components

Include proper test descriptions, assertions, and cleanup. Follow AAA pattern (Arrange, Act, Assert). Ensure tests are isolated and deterministic.