Guided: JavaScript Unit Testing with Jest

Supercharge your JavaScript code with confidence! This guided Code Lab will walk you through the essentials of unit testing using Jest. You'll learn how to set up your testing environment, write effective tests for various scenarios, and leverage powerful features like mocking and spying to ensure the reliability and maintainability of your JavaScript applications.

Get started Contact sales

Path Info

Level

Beginner

Duration

45m

Published

Jun 26, 2025

Author

Julian Mateu

Julian is a Backend Engineer working with Java, Python, and distributed cloud systems. He has worked in Amazon, Google, and various startups, and focuses on first principles over tools.

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

Provided environment for hands-on practice

We will provide the credentials and environment necessary for you to practice right within your browser.

Guided walkthrough

Follow along with the author’s guided walkthrough and build something new in your provided environment!

Did you know?

On average, you retain 75% more of your learning if you get time for practice.

Ready to get started?