What are some examples of using Sinon.js for testing?

Can you provide some examples of how to use Sinon.js for testing JavaScript code?

Sure! Sinon.js is a library for creating spies, mocks, and stubs in JavaScript. For example, you can use a spy to track calls to a function.

How do I create a spy in Sinon.js?

You can create a spy using sinon.spy(). For instance: const mySpy = sinon.spy(); This will create a spy that you can use to monitor function calls.

What about stubs? How do they differ from spies?

Stubs are similar to spies, but they can also replace the function's implementation. You create a stub with sinon.stub(), which allows you to control the behavior of the function.

Can you show me a simple example of a stub?

Absolutely! Here's a simple example: const myStub = sinon.stub(); myStub.returns(42); This stub will return 42 whenever it's called.