Mastering JavaScript Unit Testing

A comprehensive, beginner-friendly guide covering everything from the basics to advanced techniques

4.7Stars3661 reviews

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Course Overview

  • Beginner to Pro
  • 4 hours of HD video
  • 70 lessons
  • Downloadable content
  • Hands-on exercises
  • English captions
  • Certificate of completion
  • Lifetime access
  • Learn at your own pace

Clear. Concise. Comprehensive.

Tired of piecing together disconnected tutorials or dealing with rambling, confusing instructors? This course is for you! It's perfectly structured into a series of bite-sized, easy-to-follow videos that cover both theory and practice.

Highly practical

What You'll Learn

  • Explore the fundamentals of unit testing and its benefits.
  • Master core unit testing techniques and best practices.
  • Craft maintainable, robust, and trustworthy tests that deliver value.
  • Learn to execute and navigate tests effectively in VSCode.
  • Perform positive, negative, and boundary testing for comprehensive coverage.
  • Evaluate code coverage to ensure comprehensive testing.
  • Create parameterized tests for versatile testing scenarios.
  • Isolate code with mocks and learn when to use them.
  • Spy on functions to gain insights into their behavior.
  • Improve code quality using static analysis tools.
  • Utilize Prettier to format your code consistently.
  • Implement ESLint to catch code quality issues early.
  • Prevent type errors in your code using TypeScript.
  • Automate code quality checks using Husky.
A perfectly structured course

Course Content

4 Hours . 6 Sections . 70 Lessons

Getting Started(7m)

Introduction to Unit Testing(54m)

    Core Unit Testing Techniques(1h)

      Breaking Dependencies with Mocks(54m)

        Improving Code Quality with Static Analysis Tools(35m)


            Target student

            Who Is This For?

            • Developers looking to enhance their JavaScript skills through effective unit testing.
            • Software engineers aiming to improve code quality, reliability, and maintainability.
            • JavaScript enthusiasts wanting to dive deeper into testing frameworks and best practices.
            • Anyone looking to boost their career prospects by mastering JavaScript unit testing.
            A complete beginner-friendly course

            No Prior Knowledge Needed

            You don't need prior knowledge of unit testing to take this course. However, you should be familiar with modern JavaScript features such as arrow functions, modules, promises, etc.

            Is this course for you?

            Frequently-asked Questions

            • Does this course cover testing React apps?

              No, this course primarily focuses on foundational unit testing principles and best practices that are often overlooked and miss from other courses. I believe that mastering these fundamentals is essential before diving into testing React apps. I'm actively developing a separate course dedicated to testing React apps, which will cover advanced techniques like testing components, forms, authentication, state management, and routing. Completing 'Mastering JavaScript Unit Testing' will set you up for success in my upcoming React testing course.

            • Will I get 'Testing React Apps' for free if I enroll in this course?

              Unfortunately not! That's an entirely separate course that you need to purchase if you're interested. You may also consider buying a subscription to get access to all the courses in the library.

            • Does this course use Jest?

              In this course, we'll use Vitest, which is a better alternative to Jest as it's built from the ground up for modern JavaScript apps. All the concepts you'll learn in this course will directly transfer to Jest.


            I'm Mosh Hamedani.

            Are you feeling stuck or overwhelmed in your coding journey? Don't worry, I've got your back! Together, we'll work to level up your skills, increase your earning potential, and build a brighter future.


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            What my students say

            4.7out of 5 based on 3661 reviews

            I started learning programming w/ Mosh 4 years ago with his C# & .NET courses. Thanks to those I landed my first job. Then, I continued to learn from his materials and made the jump from Jr. to Ssr. and then to Sr. Software Engineer (my salary went 10x from my first job). Now, 4 years later I continue to learn with his excellent courses.

            Federico Figueredo
            Federico Figueredo

            Mosh doesn't fail to leave out important details. You can tell that Mosh has put a lot of thought into creating these courses. His professional and personal experience drives these courses to be thoughtful and outstanding.

            Enkhjin Batzul

            The best courses I’ve participated so far. Mosh has a unique teaching ability. His lectures are fun and engaging. The visuals are great. Relatively dificult concepts are explained with simple words. Whenever any one asks for a programming course I recommend Mosh Hamedani, and only him. Other courses I’ve had were at best mediocre.


            I love how every part of the course is broken down very well that even beginners can understand it and not feel overwhelmed, confused or carried away. Also how the lessons/course is in sections, one can go back to a particular section for review if need be especially when working on the exercises.

            Gerald Ikenna
            Gerald Ikenna

            I found this course to be complete and very clear and easy to follow. Mosh is very good at explaining, it feels like a friend talking to you very naturally, and the course is very entertaining. And it comes at an amazing value! I definitely recommend it!

            Marco Delbue

            This is my second course from Mosh and it is great as well, The way he explains little details (how and why's) is very helpful and builds a solid base of understanding the code. Great instructor!

            Nadia Shahid

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