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

What kind of test does Jest _not_ support?

What kind of test does Jest not support?

Specify a `jestTests` field in our `package.json` file.


Include a `jestConfig.js` file in the root directory of our application.


Declare file-specific configurations at the top of each `.test.js` file.


Create a `myAppJestConfig.json` file, and use the `–config` flag to specify the path to it.


Which action can we configure Jest through?


Which action can we configure Jest through?

(Fill in the blank.) Jest tests are made up of ________.

(Fill in the blank.) Jest tests are made up of ________.

(Select all that apply.) How do we install Jest?


(Select all that apply.) How do we install Jest?

Which company created and maintains Jest?

Which company created and maintains Jest?

**(True or False)** When debugging our tests in VSCode, we start by adding a <code>debugger;</code> statement to our test.

(True or False) When debugging our tests in VSCode, we start by adding a <code>debugger;</code> statement to our test.

**(True or False)** Jest can be configured with support for TypeScript.

(True or False) Jest can be configured with support for TypeScript.

Which option renders more extensive information, such as errors and warnings, for individual tests?


Which option renders more extensive information, such as errors and warnings, for individual tests?

**(Select all that apply.)** Which CLI options prevent Jest from exiting after a run has completed and will instead rerun tests related to files as changes are made in them?


(Select all that apply.) Which CLI options prevent Jest from exiting after a run has completed and will instead rerun tests related to files as changes are made in them?

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 Jest Fundamentals