What are mocking and stubbing in Node.js tests?

What are mocking and stubbing in Node.js tests?

Mocking and stubbing are techniques used in testing to isolate components. Mocking simulates behavior, while stubbing provides predefined responses.

Can you give me an example of how to use a mock in a test?

Sure! In a Node.js test using Jest, you can mock a function like this: jest.mock('moduleName'); and then define its behavior.

What’s the difference between a mock and a stub?

A mock is used to verify interactions, while a stub is used to provide specific responses without verifying interactions.

When should I use mocking or stubbing?

Use mocking when you need to verify that a function was called, and stubbing when you want to control the output of a function.