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CHAPTER 4 TEST-DRIVEN MYSQL DEVELOPMENT
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amazing how complicated it can become. Creating the test before the code sounds backward. You may be wondering how you can test something that doesn t exist. How can that help Developing the test first allows you to focus on the design of your software rather than the code. I ll explain a typical test-driven agile development process so you can see how test-driven development complements the design and actually drives the source code. Yes, I know that sounds weird, but give it a chance and it will make sense. Test-driven development begins with a simple model of the system. This is usually a simple class diagram of the basic classes within the system. The class diagram is set with just the empty class blocks annotated only with the proposed name of the class. I say proposed because this is usually the point at which developers used to traditional methods get stumped. In agile practices nothing is set in stone and anything can be a candidate for change. It just has to make sense to do so and to further the ultimate goal of producing the software that the customer wants. Once an initial class diagram is created, it is copied, set aside, and referred to as the domain model because it depicts the initial layout of your classes. From there, use case diagrams and supplemental use case scenarios (textual descriptions of the use case and alternative execution sequences) are created. Each use case is then augmented by a single sequence diagram, which maps out the functions needed for the classes referenced. As each class begins to take shape, you then begin writing the tests. Yes, even though the classes don t exist you still write the tests. The tests form a hybrid of integration, system, and interface testing (all white-box techniques) where each test exercises one of the classes in the domain model.
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Note White-box testing is testing without knowledge of how the system is constructed. Black-box testing
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is testing the behavior of the system given knowledge of its internal structures.
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For most agile practices, it is at this point that the lessons learned from the first iteration of this sequence are incorporated into the appropriate parts of the design (use case, sequence diagram, etc.) and the appropriate changes are made.
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Note Some agile practitioners add another modeling step to the process by using robustness diagrams.
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This adaptation closely resembles the ICONIX process. For more information about the ICONIX process, see Agile Development with ICONIX Process.3
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Sometimes these changes include the discovery of new classes, the reorganization of the existing class, and even the formulation of the methods and properties of the class. In other words, writing the test before the code helps validate the design. That is really cool because once you complete the level of design you want for your iteration and begin writing the source code, you already have your tests completed! You can simply run your tests and demonstrate
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3. D. Rosenberg, M. Stephens, M. Collins-Cope. Agile Development with ICONIX Process (Berkeley, CA: Apress, 2005).
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CHAPTER 4 TEST-DRIVEN MYSQL DEVELOPMENT
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your code is working as designed. Of course, if you need to change the test and therefore the design, well, that s the beauty of agile development.
Benchmarking
Benchmarking is an activity designed to establish performance characteristics of software. You can use benchmarking to establish a known performance level (called a baseline) and then later run the benchmarks again after a change in environment to determine the effects of those changes. This is the most common use of benchmarking. Other uses include identification of performance limits under load, managing change to the system or environment, and identifying conditions that may be causing performance problems. You perform benchmarking by running a set of tests that exercise the system and storing the performance counter results. These results are called benchmarks. They are typically stored or archived and annotated with a description of the system environment. For example, savvy database professionals often include the benchmarks and a dump of the system configuration and environment in their archive. This permits them to compare how the system performed in the past with how it is currently performing and identify any changes to the system or its environment. The tests are normally of the functional variety and are targeted toward testing a particular feature or function of the system. Some benchmarking tools include a broad range of tests that examine everything about the system, from the mundane to the most complex operations, under light, medium, and heavy loads. Although most developers would consider running benchmarks only when something odd happens, it can be useful to run the benchmarks at fixed intervals or even before and after major events, such as changes to the system or the environment. Just be sure to remember to run your benchmarks the first time to create a baseline. Benchmarks taken after an event without a baseline will not be very helpful!
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