Testing Vue.js components with Jest
Testing Vue.js components with Jest
A concise guide to testing Vue.js components using Jest and the official library vue-test-utils
About the Book
Vue.js has become the most popular framework of 2018. People is excited about it, and that's no surprise given how productive, easy to use and flexible it is. You've probably already use it, but... Have you done testing in Vue.js?
Unit testing in modern component based JavaScript frameworks is not easy. Components are connected to each other and the browser adds a layer of UI, which makes everything so dependent while we must test components in isolation. We want the test suite to be reliable and to run fast as well.
This book shows you by practise how to test easily Vue.js components and take advantage of the fully featured Jest testing framework. It will guide you through testing styles and structure as well as testing behaviours of you Vue.js components. You'll see how to apply techniques such as snapshot testing, shallow rendering, module dependency mocking and module aliasing to make smoother and cleaner your tests.
About the Author
Reader Testimonials
Kirsty Forrester
This is the first book I've read on this topic which was actually useful. I've tried to set up module aliases for a while and now I've got it done in a couple of minutes. THANK YOU.
Paul Melero
This has been the most valuable resource while learning to test Vue components so far. Thanks, @alexjoverm!
M Haris Khan
Thanks Alex! What I needed, explained very well.
Table of Contents
-
1. Write the first Vue.js Component Unit Test in Jest
- Set up a vue-test sample project
- Testing a Component
- Testing a Component with vue-test-utils
-
2. Test Deeply Rendered Vue.js Components
- Adding a Message Component
- Testing MessageList with Message Component
-
3. Test Styles and Structure
- The Wrapper object
-
4. Test Properties and Custom Events
- Properties
- Custom Events
- Wrapping up
-
5. Test Computed Properties and Watchers
- Computed Properties
- Watchers
- Wrapping Up
-
6. Test Methods and Mock Dependencies
- Mock External Module Dependencies
- Keep mocks externalized
- Wrapping Up
-
7. Test Vue.js Slots
- Make MessageList slot based
-
$childrenand$slots - Testing Slots
- Testing Named Slots
- Testing Contextual Slot Specs
- Wrapping
-
8. Enhance Jest configuration with Module Aliases
- Webpack aliases
- Multiple aliases
- Other solutions
- Wrapping Up
-
9. Snapshot Testing
- Rethinking in Snapshots
- When Snapshot Testing doesn’t help
- When a test fails
- Conclusion
Authors have earned$10,343,559writing, publishing and selling on Leanpub, earning 80% royalties while saving up to 25 million pounds of CO2 and up to 46,000 trees.
Learn more about writing on Leanpub
The Leanpub 45-day 100% Happiness Guarantee
Within 45 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.
See full terms
Free Updates. DRM Free.
If you buy a Leanpub book, you get free updates for as long as the author updates the book! Many authors use Leanpub to publish their books in-progress, while they are writing them. All readers get free updates, regardless of when they bought the book or how much they paid (including free).
Most Leanpub books are available in PDF (for computers), EPUB (for phones and tablets) and MOBI (for Kindle). The formats that a book includes are shown at the top right corner of this page.
Finally, Leanpub books don't have any DRM copy-protection nonsense, so you can easily read them on any supported device.
Learn more about Leanpub's ebook formats and where to read them
Top Books
- #1
Continuous Delivery Pipelines
Dave FarleyThis practical handbook provides a step-by-step guide for you to get the best continuous delivery pipeline for your software.
- #2
Top 20 Digital Health Trends For The Near Future
Dr. Bertalan MeskoDigital technology could help transform unsustainable healthcare systems, provide cheaper, faster, and more effective solutions for diseases – and could lead to healthier individuals living in healthier communities.
In this book, we analyze the top 20 trends shaping the future of healthcare, and what they all look like in practice.
- #3
Introducing EventStorming
Alberto BrandoliniThe deepest tutorial and explanation about EventStorming, straight from the inventor.
- #4
Ansible for DevOps
Jeff GeerlingAnsible is a simple, but powerful, server and configuration management tool. Learn to use Ansible effectively, whether you manage one server—or thousands.
- #5
Atomic Kotlin
Bruce Eckel and Svetlana IsakovaFor both beginning and experienced programmers! From the author of the multi-award-winning Thinking in C++ and Thinking in Java together with a member of the Kotlin language team comes a book that breaks the concepts into small, easy-to-digest "atoms," along with exercises supported by hints and solutions directly inside IntelliJ IDEA!
- #6
Practical FP in Scala: A hands-on approach
Gabriel VolpeA practical book aimed for those familiar with functional programming in Scala who are yet not confident about architecting an application from scratch.
Together, we will develop a purely functional application using the best libraries in the Cats ecosystem, while learning about design patterns and best practices.
- #7
Modern Typescript
Ben Beattie-HoodCovering from basic building of interfaces to advanced use of unions, partials, intersections, and mapped types. Join me for this deep-dive from fundamentals to advanced aspects of Typescript, and how you can leverage its static testing system to accelerate your development velocity.
- #8
The Hundred-Page Machine Learning Book
Andriy BurkovEverything you really need to know in Machine Learning in a hundred pages.
- #9
R Programming for Data Science
Roger D. PengThis book brings the fundamentals of R programming to you, using the same material developed as part of the industry-leading Johns Hopkins Data Science Specialization. The skills taught in this book will lay the foundation for you to begin your journey learning data science. Printed copies of this book are available through Lulu.
- #10
OpenIntro Statistics
David Diez, Christopher Barr, Mine Cetinkaya-Rundel, and OpenIntroA complete foundation for Statistics, also serving as a foundation for Data Science.
Leanpub revenue supports OpenIntro (US-based nonprofit) so we can provide free desk copies to teachers interested in using OpenIntro Statistics in the classroom and expand the project to support free textbooks in other subjects.
More resources: openintro.org.
Top Bundles
- #1
Software Architecture for Developers: Volumes 1 & 2 - Technical leadership and communication
2 Books
"Software Architecture for Developers" is a practical and pragmatic guide to modern, lightweight software architecture, specifically aimed at developers. You'll learn:The essence of software architecture.Why the software architecture role should include coding, coaching and collaboration.The things that you really need to think about before... - #2
CCIE Service Provider Ultimate Study Bundle
2 Books
Piotr Jablonski, Lukasz Bromirski, and Nick Russo have joined forces to deliver the only CCIE Service Provider training resource you'll ever need. This bundle contains a detailed and challenging collection of workbook labs, plus an extensively detailed technical reference guide. All of us have earned the CCIE Service Provider certification... - #5
9 Books-Bundle: Shut Up and Code!
9 Books
"Shut up and code." Laughter in the audience. The hacker had just plugged in his notebook and started sharing his screen to present his super-smart Python script. "Shut up and code" The letters written in a white literal coding font on black background was the hackers' home screen background mantra. At the time, I was a first-year computer... - #6
The Python Craftsman
3 Books
The Python Craftsman series comprises The Python Apprentice, The Python Journeyman, and The Python Master. The first book is primarily suitable for for programmers with some experience of programming in another language. If you don't have any experience with programming this book may be a bit daunting. You'll be learning not just a programming...
