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CHAPTER 3
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Hello World! Using DDT
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In this chapter, Alice wakes up and wonders if her adventures through the TDD looking glass were all just a disturbing dream. Meanwhile we ll hit Reboot on the Login example and start over, this time following DDT. We hope this will help to illustrate some of the key differences between the two approaches. In particular, DDT provides a systematic method of identifying, up-front, the critical areas of a design that will benefit the most from automated testing.
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CHAPTER 3 HELLO WORLD! USING DDT
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Note As this chapter provides an end-to-end run of DDT (from requirements to tests and product code), we ll breeze through a number of concepts that we ll return to later, and spend the rest of the book exploring at a more sedate pace. So don t panic if things aren t entirely clear at first; this chapter is more about providing a taste of what DDT is all about.
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Top Ten Features of ICONIX/DDT
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Before we get started, let s look at the top ten features of ICONIX/DDT. This section expands on the right column in Table 1-1 (see 1), which lists the main differences between TDD and DDT.
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10. DDT Includes Business Requirement Tests
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When you design software following the ICONIX Process, you will typically create requirement elements in your UML model, and allocate those requirements to use cases. Since you ve taken the trouble to do this, it seems only reasonable that any automated support for DDT should create tests to verify that each requirement has been satisfied. So that s what we do.
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9. DDT Includes Scenario Tests
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A key feature of DDT is that you create scenario tests by expanding use cases into threads. ICONIX Process is a use case driven approach to development. Following this approach, your use cases will be modeled to identify both sunny day and rainy day scenarios. As it turns out, this is very convenient for defining scenario tests... these tests typically involve a script of user actions and expected system responses. Each script or thread might involve part of the sunny day scenario combined with one of the rainy day branches. DDT includes a thread expansion algorithm that helps us to create these acceptance tests automatically from the use cases. We ll talk more about scenario testing and use case thread expansion in 7.
8. Tests Are Driven from Design
With DDT, the tests have two purposes: Validate your implementation of the design (primary task) Act as regression tests (secondary task)
The tests are driven from the design, and, therefore, the tests are there primarily to validate the design. That said, there s more common ground between this and TDD than you might think. A lot of the design churn (aka refactoring) to be found in TDD projects can be calmed down and given some stability by first applying the up-front design and testing techniques described in this book. With DDT the tests also document the intent of the code to an extent, but that s a nice side effect rather than the main purpose, as the process also generates real documentation for you along the way. So the tests are not the design, and the design is not driven from the tests, but rather the tests are identified systematically from the design. With DDT the design is the design, the code is the code, and the tests are the tests. (Pretty radical, hey ) You ll use modern development tools to keep the
CHAPTER 3 HELLO WORLD! USING DDT
documented design model in sync with the code. You ll also distinguish between the design level unit tests and the analysis level acceptance tests and clearly understand when it s time to write each one.
7. DDT Includes Controller Tests
What s a controller test, you ask Simply put, it s similar to a unit test, but it tests a small group of closely related methods that together perform a useful function. You can do controller testing with DDT because the ICONIX Process supports a conceptual design stage, which uses robustness diagrams as an intermediate representation of a use case at the conceptual level. If you think of unit tests as atomic, you can think of controller tests as molecular.
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