Effective Testing with RSpec 3: Build Ruby Apps with Confidence (英語) ペーパーバック – 2017/9/9
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"Our tests are broken again!" "Why does the suite take so long to run?" "What value are we getting from these tests anyway?" Solve your testing problems by building and maintaining quality software with RSpec - the popular BDD-flavored Ruby testing framework. This definitive guide from RSpec's lead developer shows you how to use RSpec to drive more maintainable designs, specify and document expected behavior, and prevent regressions during refactoring. Build a project using RSpec to design, describe, and test the behavior of your code. Whether you're new to automated tests or have been using them for years, this book will help you write more effective tests.
RSpec has been downloaded more than 100 million times and has inspired countless test frameworks in other languages. Use this influential Ruby testing framework to iteratively develop a project with the confidence that comes from well-tested code. This book guides you through creating a Ruby project with RSpec, and explores the individual components in detail.
Start by learning the basics of installing and using RSpec. Then build a real-world JSON API, using RSpec throughout the process to drive a BDD-style outside-in workflow. Apply an effective test strategy to write fast, robust tests that support evolutionary design through refactoring. The rest of the book provides the definitive guide to RSpec's components. Use rspec-core's metadata to slice and dice your spec suite. Dig into rspec-expectations' matchers: compose them in flexible ways, specify expected outcomes with precision, and diagnose problems quickly with the help of good failure messages. Write fast, isolated tests with rspec-mocks' test doubles while pushing your code toward simpler interfaces.
The authors, with a combined 20 years of automated testing experience, share testing wisdom that will lead to a fun, productive testing experience.
What You Need:
To follow along with the book, you'll need Ruby 2.2+. The book will guide you through installing RSpec 3 and setting up a new project to use it.
Myron Marston, a longtime Ruby programmer, has led the development of RSpec since 2012. He works as a senior software engineer at Moz in Seattle. Myron tweets as @myronmarston.
By day, Ian Dees slings code, tests, and puns at a Portland-area test equipment manufacturer. By night, he converts espresso into programming books, including "Cucumber Recipes". Ian tweets as@undees.
As for RSpec itself, I found it a very natural way of doing acceptance, unit and integration tests. The author did a good job of highlighting its strengths compared to other testing frameworks. I would recommend this book for anyone looking at various acceptance test frameworks, even non-Rubyists.
This book is really well written. The first two parts, "learn by doing", even if I was already a RSpec user, took me higher than I was, and the last three parts, "digging deeper", brought a revolution in my head.
Since this book, I am refactoring my test suites.
I didn't realize the real power of RSpec. Now I do.
Using just a few of the techniques in this book, I was able to refactor several problematic specs which are now far less brittle, easier to reason about and much quicker. In fact, I was able to reduce the runtime for a project with ~900 examples from 90 seconds to around 17 seconds. This has made a huge difference when working in the repo and the best thing is there are still low-hanging fruit I need to get to.
If you are on the fence, my challenge would be to read the first 100 pages (and you can probably skip the first 20ish). If you have prior experience with rspec, it should be a quick read while exposing helpful features, ideas and configuration you never knew about and can put into practice immediately. If you're new, even better. The first 100 are going to get you up to speed like nothing else out there and you may likely find yourself explaining things to your more experienced ruby peers!