Mocha/Chai Test Suite for Node.js APIs

Create a complete Mocha/Chai test suite for a Node.js API:

**API Framework:** {{FRAMEWORK}} (Express/Fastify/Koa/NestJS)
**Base Path:** {{BASE_PATH}}

**Endpoints to Test:**
```
{{ENDPOINTS}}
```

**Authentication:** {{AUTH_TYPE}}

**Test Structure:**
1. **Unit Tests:**
   - Controller functions
   - Service layer logic
   - Utility functions
   - Middleware

2. **Integration Tests:**
   - Full request/response cycle
   - Database operations
   - External service calls

3. **Test Categories per Endpoint:**
   - Valid requests (2xx responses)
   - Validation errors (400)
   - Authentication failures (401)
   - Authorization failures (403)
   - Not found scenarios (404)
   - Server errors (500)

**Generate:**
- Test file structure
- Setup/teardown hooks
- Test database seeding
- Supertest configuration
- Mocking with Sinon
- Coverage configuration