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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.

Beginner

52 Lessons

12h

Certificate of Completion

AI-POWERED

Explanations

AI-POWERED

Explanations

This course includes

2 Projects

44 Playgrounds

8 Quizzes

Course Overview

What You'll Learn

Course Content

Apply Your Skills

Course Overview

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 compos...Show More

Jest is a framework for testing applications developed in JavaScript. It has a well-documented and well-maintained range of tool...Show More

TAKEAWAY SKILLS

Unit Testing

Jest

JavaScript

JavaScript Testing

Frontend Testing

What You'll Learn

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

Hands-on experience with writing clean and meaningful tests for any JavaScript code

Course Content

Introduction

2 Lessons

Get familiar with Jest, a JavaScript testing framework, and its three primary test types.

Test with Jest

Types of Tests in Jest

Setting Up Jest

4 Lessons

Look at configuring Jest for TypeScript, structuring tests, and effective debugging techniques.

Jest and TypeScript

The Composition of a Test

Debugging the Tests

Quiz on Jest Fundamentals

Jest Matchers

5 Lessons

Break apart common matchers, error handling, Jest Extended, and creating custom matchers in Jest.

Using Common Matchers

Testing Error Handling

The Jest Extended Library

Writing Custom Matchers

Quiz on Jest Matchers

Writing Unit Tests

5 Lessons

Break down complex ideas for structuring, enhancing, and illustrating unit tests with Jest.

Introduction to Unit Test

Structuring Clean Tests

Additional Globals

Unit Test Examples

Quiz on Writing Unit Tests

Writing Snapshot Tests

4 Lessons

Deepen your knowledge of snapshot testing in Jest to ensure UI consistency and accuracy.

Introduction to Snapshot Tests

Creating Snapshots

Maintaining Snapshots

Quiz on Writing Snapshot Tests

Asynchronous Code

5 Lessons

See how it works to test asynchronous code in Jest using callbacks, promises, and async/await.

The Problem

Testing with Callbacks

Testing with Promises

Testing with Async/Await

Quiz on Testing Asynchronous Code

Mocking

6 Lessons

Practice using mocking to simulate external dependencies for focused and isolated test environments.

Introduction to Mocking

Mocking External Libraries

8 Lessons

Break down the essential methods for mocking various external libraries with Jest.

Introduction to Mocking Packages

Axios

Dates

Google Analytics Data

Working with Jest Mocks

Project

10.

Setup & Teardown

4 Lessons

Walk through test isolation, setup, and teardown in Jest for reliable test environments.

Isolating Tests

Testing Setup

Testing Teardown

Quiz on Setup and Teardown

11.

Test Coverage & CI/CD Pipelines

4 Lessons

Work your way through test coverage essentials and CI/CD integration using GitHub Actions and CircleCI.

Setting Up Test Coverage

Integrating with GitHub Actions

Integrating with CircleCI

Quiz on Test Coverage and CI/CD Pipelines

Test Coverage in Jest

Project

13.

Conclusion

1 Lessons

Enhance your skills in applying Jest to improve testing practices and developer productivity.

Conclusion

14.

Bonus: Best Practices

1 Lessons

Solve problems in Jest by focusing on isolation, mocking dependencies, and maintaining test coverage.

Best Practices for Testing with Jest

15.

Bonus: Resources for Continued Learning

1 Lessons

Investigate recommended resources like Jest documentation, blog articles, and integration guides.

Recommended Resources

16.

Appendix

2 Lessons

Master the steps to install, configure, and run Jest tests efficiently using various commands and options.

Installing & Running Jest

The Jest Config File

Course Author

Bryn Bennett

Project

Test a MEAN Stack Todo Application with JEST

intermediate

1 hour 20 min

Project

Test a MEAN Stack Todo Application with JEST

Learn to build a Todo application using MEAN stack and write tests to test both application’s frontend and backend using Jest.

intermediate

1 hour 20 mins

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