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.

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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.

…. To come 

… to come 

Mastering Jest: A Complete Guide to Testing

it doesn't support testing asynchronous code

**(Select all that apply.)** What does Jest support testing asynchronous code with?


(Select all that apply.) What does Jest support testing asynchronous code with?

Which keyword is used to tell Jest not to complete the test until it is called?


Which keyword is used to tell Jest not to complete the test until it is called?

**(True or False)** When testing with promises, we can make assertions directly on the `Promise` object returned.

(True or False) When testing with promises, we can make assertions directly on the <code>Promise</code> object returned.

Which option is a concerning potential consequence of improperly testing asynchronous code with Jest?


Which option is a concerning potential consequence of improperly testing asynchronous code with Jest?

Which useful functions does the `expect` function provide when working with asynchronous code?


Which useful functions does the <code>expect</code> function provide when working with asynchronous code?

Quiz on Testing Asynchronous Code

Quiz on Testing Asynchronous Code

Quiz yourself on the ins and outs of testing asynchronous code with Jest.

Introduction

Setting Up Jest

Jest Matchers

Writing Unit Tests

Writing Snapshot Tests

Asynchronous Code

Mocking

Mocking External Libraries

Working with Jest Mocks

Setup & Teardown

Test Coverage & CI/CD Pipelines

Test Coverage in Jest

Conclusion

Bonus: Best Practices

Bonus: Resources for Continued Learning

Appendix

Quiz on Testing Asynchronous Code