What are Sinon spies and how do they work?

What are Sinon spies and how do they work?

Sinon spies are functions that allow you to track calls to other functions in your code. They help in testing by providing insights into how functions are used.

Can you give me an example of how to create a Sinon spy?

Sure! You can create a Sinon spy like this: const mySpy = sinon.spy(); Then, you can call mySpy() and check how many times it was called.

How can I use Sinon spies in my tests?

You can use Sinon spies in your tests to assert that certain functions were called, how many times they were called, and with what arguments.

What is the difference between a spy and a stub in Sinon?

A spy records function calls without changing the function's behavior, while a stub replaces the function with a custom implementation.