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Key benefits

Explore the concept of testability and how to implement tests that deliver the most value

Maximize the quality of your Ruby code through a wide variety of tests

Master the real-world tradeoffs of testing through detailed examples supported by in-depth discussion

Description

This book will teach you how to use RSpec to write high-value tests for real-world code. We start with the key concepts of the unit and testability, followed by hands-on exploration of key features. From the beginning, we learn how to integrate tests into the overall development process to help create high-quality code, avoiding the dangers of testing for its own sake. We build up sample applications and their corresponding tests step by step, from simple beginnings to more sophisticated versions that include databases and external web services. We devote three chapters to web applications with rich JavaScript user interfaces, building one from the ground up using behavior-driven development (BDD) and test-driven development (TDD). The code examples are detailed enough to be realistic while simple enough to be easily understood. Testing concepts, development methodologies, and engineering tradeoffs are discussed in detail as they arise. This approach is designed to foster the reader’s ability to make well-informed decisions on their own.

Who is this book for?

This book is aimed at the software engineer who wants to make their code more reliable and their development process easier. It is also aimed at test engineers who need to automate the testing of complex systems. Knowledge of Ruby is helpful, but even someone new to the language should find it easy to follow the code and tests.

What you will learn

* Identify a unit of software for the purposes

of testing

* Manage test states with hooks, fixtures,

and mocks

* Handle external web services in tests

using various techniques

* Configure RSpec flexibly and cleanly using

support code and environment variables

* Interact with rich web apps in tests

using Capybara

* Build the right feature with behavior-driven

development

* Customize matchers and failure messages

* Verify correct development and production

environments

What do you get with Print?

Instant access to your digital copy whilst your Print order is Shipped

Paperback book shipped to your preferred address

Redeem a companion digital copy on all Print orders

Access this title in our online reader with advanced features

DRM FREE - Read whenever, wherever and however you want

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Shipments are not trackable

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Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

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Premium: Trackable delivery to most EU destinations within 4-9 business days.

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J S Apr 28, 2016

As one of the technical editors on this project, I can say this is a great book for people who already know some ruby and would like to dive into testing with RSpec. It covers all aspects of testing including mocking external services, integration tests with capybara, selenium and complete end-to-end examples. It covers some of the tricky parts of testing like testing time, testing mixins, and how to find false positives. Some of these things you only learn by experience and you can learn on the experience of this author to advance your RSpec skills quickly.

Amazon Verified review

Jeff Nyman Aug 14, 2016

I'm very torn on this book. I think the author has a good writing style and means of presentation. I like how the examples in the book are built up and how the explanations around those examples provide an incremental increase in context. The conversational tone of the book is also very welcome, as I believe it lends itself well to this kind of subject.However, all that being said, this book is plagued by what plagues many other Packt books: poor quality of the examples. Going through Chapter 2 alone, for example, you will find many mistakes not just in the text, but in the code as well.For the text problems, the issue seems to be that code was changed after the text was written but the text was not changed to reflect that. Ironic in a book that is ultimately about testing: you always make sure to test the final product.For the code, the issue is that some of it simply doesn't work as it is provided. Further, if you look at the code download that Packt makes available for the site, you will often find that the code there differs from what is in the book. And sometimes both of those differ from what the text itself describes.There is apparently one of the "technical editors" who wrote a review for this book. I'm not sure I would necessarily admit to that, given some of these issues. (Technical editors are responsible for technical accuracy.) As one of the more obvious lacks of accuracy -- and you literally cannot miss it, there is an AddressValidator class created at one point. The book itself has you call an invalid_parts() method as part of the RSpec tests for that class. Yet the AddressValidator class shown in the book has no invalid_parts() method. Nor -- at the time of writing this review -- did the code download from the Packt site. This is but one of many other issues.This happens just enough that -- depending on your time, patience, and tolerance -- you run up against a trust barrier. This is the killer problem for technical books. If readers start to feel they can't trust what the book is showing them, they are likely to go somewhere else for the information. Most likely to the numerous blogs that document tools like RSpec and can be updated on the fly if errors are found.I do want to stress that, depending on your overall experience and skill level, you absolutely can get useful information out of this book, which is why I rate this book with three stars. But there can be a lot of overhead to getting that useful information. It really is up to each reader whether the overhead is worth the effort. The best a reviewer like myself can do is at least provide you with the cautionary aspect.RSpec is a fantastic tool and Ruby is a fantastic language. It pains me to see what should be a excellent resource like this not pass muster. There is no way, for example, that I could recommend this book to any company I do consulting for. Even though I really, really want to.

Beverly Jul 26, 2016

I've been going through the book, doing the examples on each page. I'm currently on page 57, and I've found 5 errors that make the examples incorrect. Unless you correct the syntax errors and add missing methods to the example classes, you won't be able to follow the examples. So far, I also haven't seen good organization of thoughts. Lots of examples, and many of them don't work.

Rspec Essentials: Develop testable, modular, and maintainable Ruby software for the real world using RSpec

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