Mastering Jest:
Tips & Tricks
For JavaScript Developers

The ebook goes beyond Jest documentation to explain software testing techniques. I focus on unit test separation, unique mocking features, creating a maintainable test suite, patterns, and best practices.

This ebook is a compilation of curated, short, instructional, and opinionated tips and tricks that explain how you can improve the way you write and maintain your JavaScript tests.

It's going to take you about 4 hours in total to finish all the chapters, but you can also pick only topics that are most interesting for you. You take no risk with a 30-day money-back guarantee policy.

Nail the next job interview with your testing skills! Level up in just 4 hours! 🚀

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What's inside matters

What can you learn with this ebook?


Knowing the testing framework is not enough to write a good unit test. It requires practice so let me share insights, patterns, and best practices that I learned while working testing multiple Node.js backends and React.js frontend applications.

JEST Workflow

Jest is a robust framework, and I explain its most exciting features using real-world examples that will become a valuable reference while writing JavaScript unit test in the future. Understanding Jest CLI is going to make you much faster in working with tests.


I use React for frontend development. Components tests are often a big part of the test suite in my projects. Let me share some tips and gotchas to watch out for when working with Enzyme or React Testing Library.


Mocking is a controversial but powerful tool. Learn how to use it to your advantage, automate mocking or mock only part of the module.

Jest Matchers

Make your tests more descriptive and easier to read with custom matchers. Write your own or use matchers provided by the community.


Thoughts on ebook


Full Stack Engineer

"I’ve learned a few non-obvious tricks that would be hard to find otherwise. The ebook is concise, nicely put together, and definitely worth reading!"

Oktawian Jurkiewicz

JavaScript Developer

"The information in this ebook is beneficial for anyone who wants to level up his testing skills. All topics have straightforward description, often taken from the author’s experience. Enjoyed it!"

Artur Zochniak

C++, JS, Java Developer

"A brief and practical overview of not only basic, but also very advanced features of the Jest testing framework. Full of smart solutions to problems, which are often solved in a crappy and over-complicated way!"

Don't miss a chance!
Start learning new skills right now! 🚀
Price of $5 for a limited time only! Back up to $9 soon.
By purchasing you agree to the Terms & Conditions.
Save 30%, 2 ebooks for $10
Check out my 2nd ebook!