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All LessonsFree Lessons (3)

Introduction

Test with Jest Types of Tests in Jest

Setting Up Jest

Jest and TypeScript The Composition of a Test Debugging the Tests Quiz on Jest Fundamentals

Jest Matchers

Using Common Matchers Testing Error Handling The Jest Extended Library Writing Custom Matchers Quiz on Jest Matchers

Writing Unit Tests

Introduction to Unit Test Structuring Clean Tests Additional Globals Unit Test Examples Quiz on Writing Unit Tests

Writing Snapshot Tests

Introduction to Snapshot Tests Creating Snapshots Maintaining Snapshots Quiz on Writing Snapshot Tests

Asynchronous Code

The Problem Testing with Callbacks Testing with Promises Testing with Async/Await Quiz on Testing Asynchronous Code

Mocking

Introduction to Mocking Mock Functions Timer Mocks Class Mocks Client Mock Tips Server Mock Tips

Mocking External Libraries

Introduction to Mocking Packages

Google Analytics Data

Quiz on Mocking

Mini Project

Working with Jest Mocks

Setup & Teardown

Isolating Tests Testing Setup Testing Teardown Quiz on Setup and Teardown

Test Coverage & CI/CD Pipelines

Setting Up Test Coverage Integrating with GitHub Actions Integrating with CircleCI Quiz on Test Coverage and CI/CD Pipelines

Mini Project

Test Coverage in Jest

Conclusion

Bonus: Best Practices

Best Practices for Testing with Jest

Bonus: Resources for Continued Learning

Recommended Resources

Appendix

Installing & Running Jest The Jest Config File

Mastering Jest: A Complete Guide to Testing/

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Quiz on Mocking

Quiz on Mocking

Quiz yourself on mocking in Jest.

We'll cover the following...

Quiz on mocking

1.

Which option is not a reason to mock a module?

A.

It’s a dependency of the code we are testing.

B.

It makes a call to an external server.

C.

It’s causing our tests to fail.

D.

We need to be able to test that one of its functions was called.

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