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Given the fact that extension methods are not literally defined on the type being extended, it is certainly possible to become confused when examining an existing code base. For example, assume you have imported a namespace that defined some number of extension methods authored by a teammate. As you are authoring your code, you might create a variable of the extended type, apply the dot operator, and find dozens of new methods that are not members of the original class definition! Thankfully, Visual Studio s IntelliSense mechanism marks all extension methods with a unique, blue down-arrow icon (see Figure 12-5).

If you find yourself building the same types of sites over and over again, I would suggest taking a close look at using Drupal installation profiles as a means for jumpstarting the site creation process. Installation profiles automate many of the tasks associated with setting up and configuring a Drupal site. It s easy to miss a step when installing and configuring the same site structure over and over again. Installation profiles remedy that problem by automating the process. In this chapter, I covered the files associated with creating a new installation profile, the structure and content of each of those files, and the details of the configuration options associated with creating and enabling core features such as blocks, content types, fields, taxonomy, and user roles.

Figure 12-5. The IntelliSense of extension methods Any method marked with this visual icon is a friendly reminder that the method is defined outside of the original class definition via an extension method.

The previous example extended the functionality of various types (such as the System.Int32 type) for use by the current console application. However, I am sure you can imagine the usefulness of building a.NET code library that defines extensions that can be referenced by multiple applications. As luck would have it, doing so is very straightforward. 14 will delve into the details of creating and configuring custom libraries; however, if you wish to follow along for this example, create a new Class Library project named MyExtensionsLibrary. Next, rename your initial C# code file to MyExtensions.cs and copy the MyExtensions class definition in your new namespace: namespace MyExtensionsLibrary { // Be sure to import System.Reflection. public static class MyExtensions { // Same implementation as before. public static void DisplayDefiningAssembly(this object obj) {...}

// Same implementation as before. public static int ReverseDigits(this int i) {...} } }

One of the great new features incorporated into Drupal 7 core is the testing framework. You now have an integrated testing tool in core that allows you to define and automate testing of your Drupal site. The testing framework in Drupal 7 makes it possible to automatically run hundreds if not thousands of tests, making it easy to go to bed at night knowing that the changes you made to your site didn t break your site. In this chapter, I ll show you how to enable the testing framework and define, execute, monitor, and review test cases.

Note If you wish to export extension methods from a .NET code library, the defining type must be declared with the public keyword (recall that the default access modifier for a type is internal).