AI-powered learning
Save this course
Mastering Jest: A Complete Guide to Testing
Gain insights into Jest, a versatile testing framework. Learn about fundamental and advanced testing techniques, from unit tests to CI/CD integration, for comprehensive JavaScript application testing.
4.4
52 Lessons
2 Projects
12h
Join 2.9 million developers at
Join 2.9 million developers at
LEARNING OBJECTIVES
- Hands-on experience with writing clean and meaningful tests for any JavaScript code
- An understanding of the best practices for writing JavaScript tests
- Working knowledge of implementing testing coverage requirements in an application
- Familiarity with mocking the internal and external dependencies for testing
- The use of integrated test suites with a CI/CD pipeline
- Configuration of a testing environment for your needs
Learning Roadmap
1.
Introduction
Introduction
Get familiar with Jest, a JavaScript testing framework, and its three primary test types.
2.
Setting Up Jest
Setting Up Jest
Look at configuring Jest for TypeScript, structuring tests, and effective debugging techniques.
3.
Jest Matchers
Jest Matchers
5 Lessons
5 Lessons
Break apart common matchers, error handling, Jest Extended, and creating custom matchers in Jest.
4.
Writing Unit Tests
Writing Unit Tests
5 Lessons
5 Lessons
Break down complex ideas for structuring, enhancing, and illustrating unit tests with Jest.
5.
Writing Snapshot Tests
Writing Snapshot Tests
4 Lessons
4 Lessons
Deepen your knowledge of snapshot testing in Jest to ensure UI consistency and accuracy.
6.
Asynchronous Code
Asynchronous Code
5 Lessons
5 Lessons
See how it works to test asynchronous code in Jest using callbacks, promises, and async/await.
7.
Mocking
Mocking
6 Lessons
6 Lessons
Practice using mocking to simulate external dependencies for focused and isolated test environments.
8.
Mocking External Libraries
Mocking External Libraries
8 Lessons
8 Lessons
Break down the essential methods for mocking various external libraries with Jest.
9.
Setup & Teardown
Setup & Teardown
4 Lessons
4 Lessons
Walk through test isolation, setup, and teardown in Jest for reliable test environments.
10.
Test Coverage & CI/CD Pipelines
Test Coverage & CI/CD Pipelines
4 Lessons
4 Lessons
Work your way through test coverage essentials and CI/CD integration using GitHub Actions and CircleCI.
14.
Appendix
Appendix
2 Lessons
2 Lessons
Master the steps to install, configure, and run Jest tests efficiently using various commands and options.
Certificate of Completion
Showcase your accomplishment by sharing your certificate of completion.
Complete more lessons to unlock your certificate
Developed by MAANG Engineers
ABOUT THIS COURSE
Jest is a framework for testing applications developed in JavaScript. It has a well-documented and well-maintained range of tools to run tests in parallel. It is simple and works with projects using Babel, TypeScript, Node, React, Angular, Vue, etc. It works well for both client and server testing.
This course covers Jest in-depth and is agnostic of any specific JavaScript framework. The course begins with the fundamentals of Jest testing, deconstructing the components of a test and covering how to compose basic unit tests and snapshot tests with Jest correctly. Next, it shows the testing of asynchronous code and the code that relies on external dependencies. Lastly, this course illustrates how Jest testing can effectively integrate into the real-world software development cycle through CI/CD pipeline.
It gives you hands-on experience in setting up Jest, types of testing, testing coverage, mocking, and native tooling depth.
ABOUT THE AUTHOR
Bryn Bennett
Hi, I'm Bryn. I'm a full-stack engineer at Sensible Weather, a climatech startup based in Los Angeles, CA where I have spent the past 3 years helping to shape, expand and maintain the frontend ecosystem, as well as learning the nuances of climate science.
Trusted by 2.9 million developers working at companies
A
Anthony Walker
@_webarchitect_
E
Evan Dunbar
ML Engineer
S
Software Developer
Carlos Matias La Borde
S
Souvik Kundu
Front-end Developer
V
Vinay Krishnaiah
Software Developer
Built for 10x Developers
No Passive Learning
Learn by building with project-based lessons and in-browser code editor
Personalized Roadmaps
The platform adapts to your strengths & skills gaps as you go
Future-proof Your Career
Get hands-on with in-demand skills
AI Code Mentor
Write better code with AI feedback, smart debugging, and "Ask AI"
MAANG+ Interview Prep
AI Mock Interviews simulate every technical loop at top companies
Free Resources
