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CHAPTER 4 A SIMPLE CASE STUDY
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The application, called Transformer, is quite straightforward. It accepts some XML and XSLT input and can be used to show the results of the transformation on demand. Additionally, it can save and load the XML and XSLT snippets for later use. Figure 4-1 shows the main form for the application.
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Figure 4-1. The Transformer application The solution itself comprises three projects: TransformerEngine. This project consists of the actual logic for providing transformation services: it s a very simple service. TransformerGui. This project provides a Windows Forms GUI for the transformation services and consists of one form and a couple of dialog boxes. TransformerTests. This project contains the unit tests for the application, focused entirely on unit testing of the TransformerEngine assembly. So, as we had already mentioned, it is quite a simple application. Aside from the excellent source code that makes up the solution, notice that the developer has taken the time to Provide unit tests for the solution Fully utilize the C# XML-commenting capabilities across the solution Ensure a good degree of FxCop compliancy across the solution All of these features of the solution are important in terms of fulfilling the requirements of the build process. Since these activities are already completed, or at least under way, our
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CHAPTER 4 A SIMPLE CASE STUDY
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life will be made easier during the scripting process. We will see the outputs of these features using NAnt, but we can also investigate them outside the automated process. This is not an exhaustive list of analytical possibilities by any means, but these are the activities that comply with the requirements of our process. Other possibilities include analysis of software metrics, such as the depth of conditional decision making, and other such measures of complexity, unit testing coverage, and so on. The best way to see the outputs is to open the solution file and perform a build. Once we do, we can use tools to see the results of the efforts by the developer. A project for NUnit, NDoc, and FxCop is included in the solution items area for this solution.
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Note We use the following software: NUnit v2.2, NDoc v1.2, and FxCop v1.30. The source code for the
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book includes these tools under the Tools folder, and they should be ready to use.
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The Unit Tests
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Providing unit tests for a solution is not a matter of pointing the NUnit GUI at the compiled assembly and hoping for the best; the unit tests must be written by the developer(s) as part of the development of the system. In fact, if you subscribe to the Test-Driven Development concept, then the unit tests become the description of the system in many ways. A unit test for the Transformer application looks like this: [Test] public void TestGetAll() { DeleteAllTransformations(); Transformation t = new Transformation(); t.Output = "aaa"; t.Title = "aaa"; t.Xml = "aaa"; t.Xslt = "aaa"; t.Save(); t.Save(); t.Save(); ApplicationEngine engine = new ApplicationEngine(); IList transforms = engine.GetAllTransformations(); Assert.IsTrue(transforms.Count == 3); } This code is C#, but by referencing the NUnit framework assembly, we can apply an attribute to the code that allows the NUnit executable to identify the method as a test method. Other attributes exist to identify methods as those that set up a testing scenario, reset a testing scenario, or perform the same actions for groups of tests.
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CHAPTER 4 A SIMPLE CASE STUDY
This unit test removes all currently saved transformations from the database and then saves three garbage transformations as test data. Then an assertion class (provided by NUnit) is used to check that all three transformations are returned when requested, thus proving at least one part of the code the testing activities works. Testing the database can be handled in a few ways, and other methods may be more appropriate to your own needs. There are many nuances to the art of unit testing that are best explained elsewhere and in full. A good source of information can be found in James Newkirk s book Test-Driven Development in Microsoft .NET (see Further Reading at the end of this chapter). Opening up the NUnit project with the NUnit GUI allows us to run the limited unit tests. You should see the screen in Figure 4-2 with all of the lights green when the tests are run.
Figure 4-2. NUnit test results Knowing that the current suite of unit tests runs correctly is important because any failures would prevent the build process from completing successfully.
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