Gen Z JavaScript: React Testing Part 2 - API Calls, Props, & Snapshots (Jest/RTL) 12 October 2025

🔗: https://codesandbox.io/p/devbox/part3...

Welcome back to the Gen Z JavaScript series for Part 2 of our deep dive into React Unit Testing!

If Part 1 taught you the basics, Part 2 equips you with the skills needed for real-world application testing. We tackle the complex scenarios every developer faces: testing asynchronous code and managing component inputs/outputs.

In this advanced tutorial, you will master:

Mocking API Calls: Using Jest to mock network requests (like fetch or Axios) to ensure fast, isolated, and reliable tests.

Testing Props: Writing assertions to ensure your components correctly receive and respond to incoming props.

Snapshot Testing: Utilizing Jest's snapshot feature to quickly detect accidental UI changes in your components.

Advanced User Events: Handling more complex user interactions than simple clicks.

Asynchronous Testing: Techniques for using waitFor and findBy to handle API responses correctly.

Mastering these techniques will allow you to build and maintain large-scale, enterprise-level React applications with confidence.

Stay tuned for more essential JavaScript, React.js, and Angular concepts!

Link: https://codesandbox.io/p/devbox/unitt...