Testing Node.js & Mongoose with an in-memory database

IN-memory database pros & cons

Pros

• No need for mocks as code is executed directly
• Faster development
• More reliable tests as you are testing the actual code
• Tests are easier to build

Cons

• The in-memory database probably needs seeding
• More memory usage
• Test take longer to run

Repository Design Pattern

The separation of data access from business logic have many benefits

• Centralization of the data access logic makes code easier to maintain
• Business and data access logic can be tested separately
• Reduces duplication of code
• A lower chance of making programming errors

Flexibility through Repositories

• A repository is an interface between two things