## Build & Development Commands
- Use standard npm scripts: `dev`, `build`, `start`, `lint`, `format`
- Keep environment variables in `.env.local` and never commit secrets

## Testing Guidelines
- Mock external dependencies and database using in-memory MongoDB
- All code must have test coverage and tests must pass before merge

## Code Style & Guidelines 
- Follow Airbnb JavaScript/React style guide
- Use Prettier for formatting and ESLint for linting
- Structure code modularly: separate concerns (components, API, models, utils)
- Use plural names for MongoDB collections

## Documentation Guidelines 
- Document all MongoDB models and API endpoints clearly

## Developer Rule (Model Behavior)
- Act as a full-stack Next.js developer
- Write, debug, and fix code involving Next.js, Node.js, and MongoDB
- Suggest clean, efficient, and production-ready solutions

Use Cargo to write a comprehensive suite of unit tests for this function