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CHAPTER 2 LOGGING, ERRORS, AND TEST-DRIVEN DEVELOPMENT
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[TestFixture] public class TestMath { private Mathematics _obj; [TestFixtureSetUp] public void Init(){ _obj = new Mathematics(); } [TestFixtureTearDown] public void Dispose() { } [Test] public void Add() { Assert.AreEqual( 6, obj.Add( 2, 4), 6, "Addition of simple numbers"); } [Test] [ExpectedException(typeof(OverflowException))] public void OverflowAdd() { obj.Add( 2000000000, 2000000000); } } In the rewritten TestMath class, two additional methods and attributes have been added. The attribute TestFixtureSetUp is a constructor method for the test class that NUnit calls before executing the test methods. The name of the method isn t important, and in the example it s used to instantiate the type Mathematics. The attribute TestFixtureTearDown is a destructor used to clean up resources that have been allocated and initialized within the test class. When writing test scripts that use constructors and destructors, it s important to realize that state will be created. Maybe the state is desired, but bugs can arise due to state. Maybe a test is to run tests with and without state. In any case, writing tests does require some thinking about what the component does. The main reason for using a set of classes is when objects reference other objects. For example, MyClass could be part of a list. When generating a list, you d want a formatted output to make it simpler to see if the state of the objects is correct.
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This is the second chapter that doesn t explicitly reference any patterns. I ve done this on purpose, because the material presented in this chapter represents the new generation of object-oriented development processes. These processes are pioneered in a large part by the Open Source community. Even though some editions of the 2005 version of Visual Studio include testing and logging utilities, the toolkits presented have been around for years and have proven their worth. The best part is that they re free, and the source code is available.
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CHAPTER 2 LOGGING, ERRORS, AND TEST-DRIVEN DEVELOPMENT
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Regardless of which toolkits you use, TDD, logging, and proper exception and error handling are key parts of developing an application. Combining the three pieces, a developer has the pulse of an application, and knows when the application is healthy or sick. If an application is sick, then the developer will have early warning signals, and will be able to find out what s causing the sickness. Writing code using TDD takes some getting used to, but there are huge advantages, and it works. However, this chapter only touches the surface of TDD. For further reading, I recommend the book Test-Driven Development By Example by Kent Beck (Addison-Wesley, 2003).
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Defining the Foundation
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n this chapter, I introduce two main patterns: the Bridge pattern and the Factory pattern. These two patterns provide the basis of all applications. Think of a program as a house: metaphorically speaking, the two patterns provide the foundations and the walls of that house. Without these patterns, no assembly or application would ever be maintainable. The Bridge pattern separates interface from implementation, which is useful from a maintenance and extension perspective. And the Factory pattern instantiates the types that implement the Bridge pattern.
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Defining a Base for the Application
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When writing code for an application, the basis of the application will be the infrastructure, namely types without an implementation. These types define an overall application and its execution without getting bogged down in the details of implementation. What you are doing when creating the types this way is called defining an intention. Typically, intentions are defined using interfaces, and classes that implement interfaces are generally called components. In this section of the chapter, you ll learn how to define intentions and implement testdriven development as a means of creating the base for your applications.
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