Cucumber is Cool and so is The Cucumber Book

In Book Reviews, Computer science, Software Engineering, testing on December 1, 2011 at 2:37 pm

So, I’ve been learning Cucumber—a tool for writing executable acceptance tests—in preparation for my upcoming course, Testing for Developers. The course will be heavy on the theory of testing, but from the viewpoint of the developer. How do you build testability into your code, what techniques can you use, and what tools are there that will help you do test automation. Most of my students will already know the basic xUnit tools, but we will be going much more into mock objects and other techniques for writing really good unit tests. We’ll hit Test-Driven Development (TDD) hard and we’ll look at how TDD and Behavior-Driven Development (BDD) work together, etc. We’ll also be wanting to work with embedded software systems and building test tools when necessary, or at least the glue to help tools work together.

This is an ambitious undertaking. I had heard about Cucumber when I looked at RSpec several months ago. RSpec was a bit too limited for what I wanted. Then I got a copy of The Cucumber Book by Matt Wynne and Aslak Hellesøy, published by The Pragmatic Bookshelf. After reading most of the book and a few weeks of playing around with Cucumber, I’m hooked. Cucumber takes the place of several tools I was thinking about introducing to my class, and allows me to into depth in several areas, using a single platform. If you’re thinking about learning Cucumber, or want to learn something about it, get this book.

The style of the book is great. It’s easy to read and describes how to use Cucumber in several bite-sized pieces. Some readers  may even find that the pieces are nibble-sized and want bigger bites. I urge you to avoid this. Install the software and go through each exercise in the steps described, even though you know what you might need to do in the next few steps. This will help you develop your intellectual muscle memory for using Cucumber. Take time to taste each bite, no matter how small it may be, because there is some new spice that was added that might be subtle if you skip over the step.

The first part of the book, chapters 1-6, introduces you to Cucumber fundamentals. Actually, this part does a little more. It teaches you something about BDD as well. If you’re really not interested in learning about BDD, you can skim chapters five and six, but I would not recommend skipping them. By the end of the first section I was able to do some useful things with Cucumber and used it to demonstrate requirement specification to my current undergraduate software engineering class.

The second part of the book, chapters 7-10, are chapters you need to read and work through if you want to become competent with Cucumber. Again, some of the discussions seemed too small to me, but after reflecting upon what I learned, I think the level is just right. Some of what you learn in this part of the book is how to work with some other tools to use databases and Web pages in your testing.

The third part of the book is one that does not have to be read in any special order, or even at all. But, if you really want to understand how to use Cucumber to define and (acceptance) test Web applications (written in Rails or otherwise) and other types of applications, you need to have these chapters available. So, skim them at least and then refer to them as necessary.

Is there a downside to this book? Well, not to the book itself. The fact is that Cucumber, like many other open source projects works in a specific inter-dependent ecosystem. Setting up Cucumber and its dependents and other pieces you might want like Sinatra, Capybara, etc. can be frustrating; especially if you want to do this on multiple platforms. If you’re not a Ruby expert, you may run into problems and will need to do some searching for answers or post to the forum for the book at the Pragmatic Bookshelf. But don’t let this scare you away. Cucumber is a good tool to learn. Whether you use it regularly or only for special occasions or specific projects, you will think a little bit differently about how you build software.


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