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CHAPTER 3 HELLO WORLD! USING DDT
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Figure 3 20. Designed, documented, and test-driven, vs. simply test-driven
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Let s sum up a few key points: DDT gives you much more bang for the buck than TDD does. Figure 3 20 makes this pretty obvious: you can get more accomplished when your process isn t Too Damn Difficult. We spent most of 2 refactoring our unit tests, with the end result being that we developed the checkPassword method. By contrast, with considerably less effort following the DDT approach, we ve designed the entire Login use case in this chapter. We haven t covered customer requirement tests or scenario tests (collectively known as acceptance tests) in this chapter, but we ll have a chapter on each topic in Part 2. But it s worth noting here that we ve already identified requirement test cases (Figure 3 8), and we ll be driving the acceptance testing from the text of the use case. In 2, the TDD design led to an interface called AccountValidator, while the behavior allocation techniques using ICONIX/DDT put a validate method on the Account class. You ll find that this approach results in a more domaindriven design.4 We ve actually realized more of the intent behind TDD following this approach than we realized by applying TDD in 2. With the DDT approach, we found ourselves thinking much more along the lines of What could possibly go wrong and What else could go wrong and creating test scenarios to cover each of these possibilities. The result is a much more rigorously designed system, where rainy day scenarios are accounted for and tested right from the get-go, rather than refactored into the design later.
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We suspect that we re preaching to the converted in this instance, but it s worth checking out Eric Evans s book Domain Driven Design: Tackling Complexity in the Heart of Software, for an in-depth treatment of the subject.
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PART 2
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DDT in the Real World: Mapplet 2.0 Travel Web Site
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Alice continued walking for a time, and was just in the midst of wondering whether she could use her Palm Pilot to get a map home from this curious place that she was lost in (or at least find a nice hotel
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room), when two soldiers, who looked strangely like index cards, approached her. Excuse me, Miss said the first soldier, but the Queen of Hearts demands to see how much code you have written.
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Over the next few chapters, we ll illustrate how to use DDT, using the real-life example of a hotel search application for travel web site VResorts.com. Because testing tends to be a backwards-looking activity, providing feedback on something just created, we ll step backwards through the project. So s 4, 5, and 6 cover the coding and design activities, or developer s space, while s 7 and 8 cover the analysis activities, or customer s space. 4 introduces the Mapplet project, and explores the ICONIX/DDT best practices that we recommend in order to give your project the best possible start. We discuss what to do on delivery of a staged release, to keep the project on track. 5 shows how to write fine-grained, white box unit tests against the detailed design. 6 explores broader-grained, gray box controller tests, which are based on a conceptual design. 7 explores one half of acceptance testing, covering scenario tests that are based on the system s behavioral specification (use cases). 8 walks through the other half of acceptance testing, business requirement tests i.e., test scripts that are the corollary of the customer s requirements. As with scenario tests, these test scripts can be signed off by the customer and used by a team of testers.
CHAPTER 4
Introducing the Mapplet Project
It s more difficult (and more time consuming) to base a book around a real software project than it is to write one with a toy example. For this book, though, we thought it was important to show how DDT works on the real thing, as we expect a bit of skepticism from test-driven developers. This chapter
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