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The blog testing script exercised several of the test functions that are included in testing framework. As you begin to document the functionality that you want to test on your site, you will need to identify how you are going to execute those tests. The how will be by stringing together one or more functions that emulate an end user performing functions on your site. Assertions validate that the tests that you execute through these functions deliver the results that you expect. The functions that you can use are defined in Table 25-1, and the assertions that you use to verify the results are listed in Table 25-2. Table 25-1. Testing Functions

The final chapter of this part examines how the CLR manages memory using the .NET garbage collector. Here you will come to understand the role of application roots, object generations, and the System.GC type. Once you understand the basics, you will examine the topics of disposable objects (using the IDisposable interface) and the finalization process (using the System.Object.Finalize() method). This chapter will also investigate a new .NET 4.0 class, Lazy<T>, which allows you to define data that will not be allocated until requested by a caller. As you will see, this feature can be very helpful when you wish to ensure you do not clutter the heap with objects that are not actually required by your programs.

This section of the book will deepen your understanding of the C# language by walking you through a number of more advanced (but very important) concepts. Here, you will complete your examination of the .NET type system by examining interfaces and delegates. You will also learn about the role of generics, take a first look at Language Integrated Query (LINQ), and examine a number of more advanced features of C# (e.g., extension methods, partial methods, and pointer manipulation).

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The material in this chapter builds upon your understanding of object-based development by covering the topic of interface-based programming. Here, you will learn how to define classes and structures that support multiple behaviors, how to discover these behaviors at runtime, and how to selectively hide particular behaviors using explicit interface implementation. In addition to creating a number of custom interfaces, you will also learn how to implement standard interfaces found within the .NET platform. You will use these to build objects that can be sorted, copied, enumerated and compared.

This chapter explores the topic of generics. As you will see, generic programming gives you a way to create types and type members, which contain various placeholders that can be specified by the caller. In a nutshell, generics greatly enhance application performance and type safety. Not only will you explore various generic types within the System.Collections.Generic namespace, but you will also learn how to build your own generic methods and types (with and without constraints).

This function executes a get request to a URL on the site. $path indicates the page that will be visited, and $options contains additional data that may be passed to URL in order to determine the URL to visit. The content will be loaded and saved into $this->_content where it can be retrieved using the $this->drupalGetContent() function. This function executes a post request on a Drupal page. $path indicates a page containing a form that will be filled with data described in the $edit parameter. Then the button indicated by $submit will be clicked. The $edit data should be an array where each index is the value of the name attribute of the HTML form element.

The purpose of 11 is to demystify the delegate type. Simply put, a .NET delegate is an object that points to other methods in your application. Using this type, you can build systems that allow multiple objects to engage in a two-way conversation. After you have examined the use of .NET delegates, you will then be introduced to the C# event keyword, which you can use to simplify the manipulation of raw delegate programming. You will wrap up this chapter by investigating the role of the C# lambda operator (=>) and exploring the connection between delegates, anonymous methods, and lambda expressions.

When the shell is given the name of a command to execute, it looks for that name in the directories listed in the PATH variable. This variable contains a colon-separated list of directories that contain executable commands. This is a typical value for $PATH: /bin:/usr/bin:/usr/local/bin:/usr/games If your program is not in one of the PATH directories, you must give a pathname, either absolute or relative, for bash to find it. An absolute pathname gives the location from the root of the filesystem, such as /home/chris/bin/hw; a relative pathname is given in relation to the current working directory (which should currently be your home directory), as in bin/hw.