Testing with Promises
Explore how to test JavaScript promises using Jest by making assertions on resolved or rejected states. Understand how Jest’s methods mirror promise handling in your code to simplify asynchronous testing.
We'll cover the following...
We'll cover the following...
Using promises
Promises are an alternative to using callbacks in JavaScript. They are at the core of modern JavaScript asynchronous code. A promise is an object that represents the completion of asynchronous code. Once created, the promise is pending and ultimately either moves into a state of being resolved or rejected, depending on whether or not the asynchronous code was ...