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The Cucumber Book: Behaviour-Driven Development for Testers and Developers


Cover image for The Cucumber Book
Pages 336
Release P3.0 (2014-03-28)
ISBN 978-1-93435-680-7

Your customers want rock-solid, bug-free software that does exactly what they expect it to do. Yet they can’t always articulate their ideas clearly enough for you to turn them into code. The Cucumber Book dives straight into the core of the problem: communication between people. Cucumber saves the day; it’s a testing, communication, and requirements tool – all rolled into one.

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About This Book

Matt Wynne and Aslak Hellesøy show you how to express your customers’ wild ideas as a set of clear, executable specifications that everyone on the team can read. You’ll learn how to feed those examples into Cucumber and let it guide your development. You’ll build just the right code to keep your customers happy, and not a line more. Although it was born in the Ruby community, you can use Cucumber to test almost any system, from a simple shell script or Perl script, to web applications written in PHP, Java, or any platform.

In Part 1, you’ll get started by using the core features of Cucumber and working with Cucumber’s Gherkin DSL to describe—in plain language—the behavior your customers want from the system. Then you’ll write Ruby code that interprets those plain-language specifications and checks them against your application. If you’re new to Cucumber, this part of the book will teach you everything you need to know to get started.

In Part 2, you’ll consolidate the knowledge you’ve gained with a worked example, where you’ll learn more advanced Cucumber techniques. You’ll also learn how to test asynchronous systems and systems that use a database.

In Part 3, you’ll find a selection of recipes for some of the most difficult and commonly seen situations the authors have helped teams solve. With these patterns and techniques, you’ll learn how to test Ajax-heavy web applications with Capybara and Selenium, REST web services, Ruby on Rails applications, command-line applications, legacy applications, and more.

Written by the creator of Cucumber and one of its most experienced users and contributors, The Cucumber Book is an authoritative guide that will give you and your team all the knowledge you need to start using Cucumber with confidence.

What You Need: Windows, Mac OS X (with XCode) or Linux Ruby 1.9.2 and upwards

Audience: This book contains comprehensive Cucumber information for beginning to advanced Cucumber users. If you’re a developer planning to use Cucumber with RSpec, you might also want to look at The Rspec Book.

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Contents & Extracts

Full Table of Contents

  • Cucumber Fundamentals
    • Why Cucumber? excerpt
    • First Taste
    • Gherkin Basics excerpt
    • Step Definitions: From the Outside
    • Expressive Scenarios
    • When Cucumbers Go Bad
  • A Worked Example
    • Step Definitions: On the Inside excerpt
    • Support Code
    • Dealing with Message Queues and Asynchronous Components
    • Databases
  • Cucumber Applied
    • The Cucumber Command-Line Interface
    • Testing a REST Web Service
    • Adding Tests to a Legacy Application excerpt
    • Bootstrapping Rails
    • Using Capybara to Test Ajax Web Applications
    • Testing Command Line Applications with Aruba

Brought to You By

Matt Wynne is a leading BDD practitioner, a member of the Cucumber core team, and a programmer, coach, trainer, and popular international speaker. Alongside Aslak Hellesøy and Julien Biezemans, Matt is co-founder of Cucumber Ltd., the company behind Cucumber. Matt tweets from @mattwynne and @cucumberbdd.

Aslak Hellesøy is the creator of Cucumber. During his career Aslak has worked with both small and large organizations in industries such as telecom, trading, insurance, car manufacturing, education, and government. Aslak is co-founder of Cucumber Ltd, the company behind Cucumber. He tweets from @aslak_hellesoy and @cucumberbdd.