A comprehensive, beginner-friendly guide covering everything from the basics to advanced techniques. 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.
Mastering JavaScript Unit Testing
3h 51m 31s
English
Free
- 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.
About the Author: Mosh Hamedani (Code with Mosh)
Mosh Hamedani is the founder of Code with Mosh, one of the highest-volume independent online instructors in software education. He has been publishing courses continuously since the early Udemy era and has taught over a million students across his Udemy catalog and his standalone Code with Mosh platform. His teaching style is patient, rigorously structured, and deliberately beginner-tolerant — the courses are widely cited as some of the most accessible introductions to their respective topics.
The Code with Mosh catalog covers an unusually wide span: web development with HTML / CSS / JavaScript / React / Angular / Node.js, Python and Django, C# and .NET, mobile development with React Native and Flutter, SQL and database fundamentals, and the algorithm / data-structure interview prep tracks. Few independent instructors maintain this much breadth at consistent quality.
The CourseFlix listing under this source carries over 35 Code with Mosh courses spanning that range. Material is paid; Code with Mosh runs on per-course pricing on the original platform. Courses are aimed primarily at developers picking up a new technology from a clean start through to working production proficiency.
Watch Online 55 lessons
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| # | Lesson Title | Duration |
|---|---|---|
| 1 | Welcome | 01:23 |
| 2 | Prerequisites | 00:42 |
| 3 | Course Structure | 02:16 |
| 4 | How to Take This Course | 00:59 |
| 5 | Setting Up the Testing Environment | 00:34 |
| 6 | Starter Project | 00:55 |
| 7 | Introduction | 01:40 |
| 8 | What is Unit Testing | 05:22 |
| 9 | Types of Tests | 03:15 |
| 10 | Choosing a Testing Framework | 01:40 |
| 11 | Setting Up Vitest | 01:15 |
| 12 | Writing Your First Tests | 09:21 |
| 13 | Exercise: Testing fizzBuzz | 05:57 |
| 14 | Test-driven Development | 07:11 |
| 15 | Exercise: Testing Factorial | 05:02 |
| 16 | Running Tests | 04:24 |
| 17 | Navigating Tests in VSCode | 04:12 |
| 18 | Code Coverage | 04:34 |
| 19 | Introduction | 00:55 |
| 20 | Characteristics of Good Unit Tests | 04:25 |
| 21 | Using Matchers | 03:07 |
| 22 | Writing Good Assertions | 07:18 |
| 23 | Exercise: Testing getCoupons | 09:01 |
| 24 | Positive and Negative Testing | 07:20 |
| 25 | Exercise: Testing validateUserInput | 07:19 |
| 26 | Boundary Testing | 02:58 |
| 27 | Exercise: Testing isValidUsername | 05:46 |
| 28 | Exercise: Testing canDrive | 06:36 |
| 29 | Parameterized Tests | 04:57 |
| 30 | Exercise: Parameterized Tests | 04:21 |
| 31 | Testing Asynchronous Code | 04:30 |
| 32 | Setup and Teardown | 02:43 |
| 33 | Exercise: Testing a Stack | 09:55 |
| 34 | Introduction | 00:32 |
| 35 | Creating Mock Functions | 05:39 |
| 36 | Exercise: Working with Mock Functions | 01:53 |
| 37 | Mocking Modules | 05:02 |
| 38 | Exercise: Testing getShippingInfo | 05:29 |
| 39 | Interaction Testing | 03:24 |
| 40 | Exercise: Testing submitOrder | 06:53 |
| 41 | Partial Mocking | 07:33 |
| 42 | Spying on Functions | 05:38 |
| 43 | Clearing, Resetting, and Restoring Mocks | 04:56 |
| 44 | To Mock or Not to Mock | 01:16 |
| 45 | Mocking Dates | 03:52 |
| 46 | Exercise: Testing getDiscount | 01:56 |
| 47 | Introduction | 00:34 |
| 48 | What are Static Analysis Tools | 01:13 |
| 49 | Formatting Code with Prettier | 05:11 |
| 50 | Linting Code with ESLint | 09:53 |
| 51 | Catching Type Errors with TypeScript | 06:33 |
| 52 | Running ESLint on TypeScript | 06:14 |
| 53 | Automating Code Quality Checks with Husky | 03:57 |
| 54 | Running Tests on Push | 01:34 |
| 55 | Course Wrap Up | 00:26 |
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Frequently asked questions
What prerequisites are needed before taking this course?
The course includes a dedicated lesson on prerequisites. It is designed to be beginner-friendly, so no prior experience with unit testing is required. However, a basic understanding of JavaScript is recommended to follow along effectively with the examples and exercises.
What projects or exercises will I work on during the course?
Throughout the course, you will engage in practical exercises such as testing functions like fizzBuzz, factorial, and more complex scenarios like validateUserInput and getShippingInfo. These exercises help reinforce the concepts of unit testing, test-driven development, and the use of mock functions.
Is this course suitable for experienced developers?
While the course is beginner-friendly, it also covers advanced topics like mocking modules, interaction testing, and parameterized tests, making it suitable for experienced developers looking to deepen their understanding of JavaScript unit testing. Advanced exercises and topics like code coverage and static analysis tools are also included.
What testing framework is used in this course?
The course uses Vitest as the testing framework. Lessons include setting up Vitest, writing initial tests, and using it to handle various testing scenarios such as asynchronous code, mock functions, and parameterized tests.
Does the course cover deployment or integration testing?
This course focuses specifically on unit testing and does not cover deployment or integration testing. It is structured to provide a deep dive into unit testing techniques and tools, such as matchers, mock functions, and code coverage.
How much time should I expect to commit to completing this course?
The course consists of 55 lessons, each in a bite-sized video format. While the total runtime is not specified, the course is designed to be consumed at your own pace. You should allocate time for both watching the videos and performing the exercises to gain the most benefit.
Can the skills learned in this course be applied to other programming languages or frameworks?
The fundamental principles of unit testing taught in this course, such as writing good assertions, using mock functions, and handling asynchronous code, can be applied to other programming languages and frameworks. However, specific tools like Vitest are unique to the JavaScript ecosystem.