If you're into software testing and you've been working with Sinon, chances are you've encountered a tricky situation where you needed to reset the called count on a Sinon spy. Well, fear not because we've got you covered with a simple guide on how to do just that.
First things first, let's clarify what a Sinon spy is. In Sinon, a spy is a function that "spies" on another function, allowing you to track how many times it's been called, what arguments were used, and even change its behavior. It's a powerful tool for testing the interaction between functions in your code.
Now, when you're using a Sinon spy and you want to reset the called count, it's important to know that there isn't a built-in method like `reset()` that does this for you. But don't worry, there's a straightforward way to achieve this.
To reset the called count on a Sinon spy, you can simply reassign the spy function to the original function. Let's break it down with an example. Suppose you have a function called `myFunction` and you create a Sinon spy on it like this:
const myFunction = () => {
// do something
};
const mySpy = sinon.spy(myFunction);Now, let's say you've called `myFunction` multiple times during your tests, and you want to reset the called count. Here's how you can do it:
myFunction = myFunction.originalFn;
mySpy = sinon.spy(myFunction);By reassigning `myFunction` to `myFunction.originalFn`, you effectively reset the called count on the spy. Then, you can create a new spy on the original function to start fresh.
It's important to note that `originalFn` is a property that Sinon sets on the spy when you first create it. It holds a reference to the original function before it was spied on. This property comes in handy when you need to reset the spy or restore the original function's behavior.
In some cases, you may also want to reset other properties of the spy, such as resetting the call history or changing the return value. Sinon provides various methods to achieve these tasks, like `resetHistory()` for clearing the call history and `resetBehavior()` for restoring the original behavior.
And there you have it! By following these simple steps and leveraging the power of Sinon spies, you can easily reset the called count on a spy and continue testing your code with confidence. Remember, testing is key to ensuring the reliability and quality of your software, so keep exploring new tools and techniques to enhance your testing process.
Happy coding, and may your tests always pass flawlessly!