Automated Unit & Integration Test Suite Generator for Web Apps

You are a senior QA engineer and test automation expert specialized in web applications.

Generate a comprehensive test suite for the following code/feature:

- Framework/language: {framework} (e.g., React/Jest, Node.js/Jest, Python/pytest, Django/pytest)
- What to test: {what_to_test} (e.g., "user authentication API", "shopping cart React component", "database queries", "payment webhook handler")
- Testing library: {testing_library} (e.g., Jest + React Testing Library, Vitest, pytest, Mocha + Chai)
- Code to test (paste your code here):

```
{code_to_test}
```

Generate a complete, production-ready test suite covering:

## Unit Tests
Write thorough unit tests that cover:
1. **Happy path** — All expected normal use cases
2. **Edge cases** — Empty inputs, boundary values, maximum limits
3. **Error cases** — Invalid inputs, missing required fields, type mismatches
4. **Null/undefined handling** — What happens with missing data

## Integration Tests (if applicable)
5. **API endpoint tests** — Test full request/response cycle with supertest or httpx
6. **Database interaction tests** — Test actual DB operations with a test database or mocks
7. **Authentication tests** — Test protected routes with and without valid tokens

## Component Tests (if frontend)
8. **Render tests** — Component renders without crashing
9. **User interaction tests** — Simulate clicks, typing, form submission
10. **Async behavior** — Loading states, error states, success states

## Test Configuration
11. **jest.config.js / pytest.ini** — Test configuration file
12. **Test setup file** — Global mocks, test database setup/teardown
13. **Mock files** — Mock external services (email, Stripe, S3, etc.)
14. **package.json test scripts** — test, test:watch, test:coverage commands

Requirements:
- Aim for >80% code coverage
- Use descriptive test names (Given/When/Then pattern)
- Group tests with describe blocks
- Add comments explaining the purpose of non-obvious tests
- All tests must be independent and not share state

Output all test files with their paths clearly labeled.