Andrea Leopardi - Testing Elixir: Effective and Robust Testing for Elixir and its Ecosystem
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Elixir offers new paradigms, and challenges you to test in unconventional ways. Start with ExUnit: almost everything you need to write tests covering all levels of detail, from unit to integration, but only if you know how to use it to the fullest - well show you how. Explore testing Elixir-specific challenges such as OTP-based modules, asynchronous code, Ecto-based applications, and Phoenix applications. Explore new tools like Mox for mocks and StreamData for property-based testing. Armed with this knowledge, you can create test suites that add value to your production cycle and guard you from regressions.
Write Elixir tests that you can be proud of. Dive into Elixirs test philosophy and gain mastery over the terminology and concepts that underlie good tests. Create and structure a comprehensive ExUnit test suite, starting from the basics, and build comprehensive test coverage that will provide safety for refactoring and confidence that your code performs as designed. Use tests to make your software more reliable and fault tolerant.
Explore the basic tool set provided by ExUnit and Mix to write and organize your test suite. Test code built around different OTP functionality. Isolate your code through dependency injection and by using Mox. Write comprehensive tests for Ecto projects, covering Ecto as a database tool as well as a standalone data validation tool. Test Phoenix channels from end to end, including authentication and joining topics. Write Phoenix controller tests and understand the concepts of integration testing in Elixir. Learn property-based testing with StreamData from the author who wrote the library.
Code with high confidence that you are getting the most out of your test suite, with the right tools that make testing your code a pleasure and a valuable part of your development cycle.
What You Need:
To get the most out of this book, you will need to have installed Elixir 1.8 or later and Erlang/OTP 21 or later. In order to complete the relevant chapters, you will also need Ecto 3.1 or later, EctoSQL 3.1 or later and Phoenix 1.3 or later.
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This book is sprinkled with excellent testing advice! The breadth of testing topics covered within the Elixir ecosystem makes this book an excellent resource for any Elixir developer! Highly recommend!
| Benjamin Tan |
| Author of The Little Elixir and OTP Guidebook |
Testing Elixir is an incredible resource for developers of all skill levels. Whether you are beginning your Elixir journey and are designing your first test suite or are an experienced Elixir developer looking for reference material, there is something here for you. This book breaks down a wide range of testing concepts into modular chunks so that you can grab what you need and be on your merry, happily tested way.
| Sundi Myint |
| Co-Host of the Elixir Wizards Podcast and Developer, Smart Logic |
This is exactly the book that was missing in the Elixir community. It introduces its readers to various testing methodologies from an Elixir lens as well as when to use them. It is loaded with code examples and detailed explanations. A must read!
| Adi Iyengar |
| Back-End Engineer |
I would recommend this book to anyone who wants to go beyond basic unit tests. It covers all areas of Elixir apps with examples and information about libraries to leverage in testing.
| Todd Resudek |
| Hex Core Team Member |
Acknowledgments
Books dont get published without people reviewing them first. Were deeply grateful to all the folks who spent their time and effort carefully reading and reviewing this book. Thank you to Amos King, Ayomide Aregbede, Devon Estes, Doyle Turner, Geoff Smith, Jonathan Carstens, Justin Smestad, Pedro Medeiros, Solomon White, Todd Resudek, and Zach Thomas.
A special thank you goes to Karl Matthias, who provided thorough and thoughtful comments that challenged our assumptions and pushed us to rethink, reshape, and reword concepts and sentences all over the book. The books quality wouldnt have been the same without Karls input.
Another special thank you goes to Kim Shrier, whose reviews were so detailed and neatly organized that it made addressing his comments a breeze.
Most importantly, this book would never have gotten to print without the guidance (and patience) of our Development editor, Jackie Carter. Thank you.
The biggest thank you goes to the most important person in my life, my wife, Kristina. I cant imagine any other human being so full of support and encouragement. Youre the light of my life.
Thank you to my parents for setting up a life for me that made it possible for me to write a book about something. Thats pretty crazy. Thank you to my other family, Contrada Cavalli, for filling that life with enough love and fun to give me the energy to learn, work, grow, and write this book.
Thank you to Jos Valim for creating a beautiful programming language that works the same way my mind does. Jos, you have been (possibly without even knowing it) an incredible mentor in my career, both in programming as well as in interacting with people.
Thank you to everyone at Community.com who supported me and gave me time and mental space to work on this book while giving me chance after chance to learn and grow professionally.
Thank you to Jeffrey for dragging me into this adventure. You were a friend before this book, but now we share something that will, if you think about it, outlive both of us. Spooky but pretty cool.
Before I ever started on this book, several people helped set me up for success. Josh Kaiser and Ted Coleman gave me a trial by fire, making me the testing expert for our team only months into my career. That formed the foundation of everything that I know. Bradley Smith gave me my first opportunity to get paid to work in Elixir and taught me a lot of the foundation of my software knowledge, as well as tolerated my insistence on testing all the things.
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