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hen a piece of software grows beyond a few hundred lines, how do you know if it is broken How do you know if it is doing what it is supposed to do How do you know if there is a case, maybe driven by user input, that will cause the whole application to crash Common sense will tell us that you need to develop a set of tests to test all the individual pieces, components, or modules of the application as well as tests to cover all the scenarios of possible interactions between those components and external entities such as users and other systems. Let s illustrate some points about testing by using the perhaps most overused analogy in software engineering, the building of a house. A house can be seen from many different perspectives by the different people involved in its construction and use. The house can be seen as a collection of individual components (like bricks, wood beams, doors, nails, etc.). This is the most simplistic component view of a house. From this perspective we draw the conclusion that if each one of those components has passed some sort of quality control by the manufacturer, all that is left to test is the interaction between those components. Today in software development the term unit testing is commonly used to refer to the type of testing that isolates a unit and tests its internal functionality as well as its external contracts. If you approach testing as the first stage of development, unit testing becomes testing of code that you are yet to write. The test-first philosophy is at the core of test-driven development (TDD) and has been proven to improve code quality and control the scope of a project. In the house example, the manufacturer testing would be considered unit testing. Unit testing in Java treats a Java class as the atomic unit of functionality and mixes white-box and black-box testing. For example, if a class MyClass has a public method called doSomething that depends on a private method performCommonOperation, then as part of the tests for MyClass, let s say in class MyClassTest, we will have a method performCommonOperationTest (a white-box test) and a doSomethingTest (black-box test). A software test has certain preconditions, and the actual test is checking the post-conditions against the expected state for the given preconditions.
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When a client makes a DNS query of a DNS server, and the server doesn t have the information either in its own records or in its cache of known IP addresses from previous queries, there are three possible options for the server: Return record not found Forward the query to a nearby server that might have the information Forward the query to one of the Internet s root DNS servers Obviously the rst option isn t terribly useful, unless you re creating a very private test network and you don t want any queries going outside it. The second option, DNS forwarding, was the default behavior for SBS 2003 and is still the default if you migrate from SBS 2003 to SBS 2008. In SBS 2003, the DNS server was con gured to automatically forward DNS requests that it didn t have the answer for to the DNS server of your Internet service provider (ISP). This was ef cient because the ISP s DNS servers were
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Website restrictions set up in Parental Controls work independently of Content Advisor in Internet Explorer, and there are some important differences in the approach taken by these two tools . Because it s part of Internet Explorer, Content Advisor has no effect when another web browser is being used, whereas Parental Controls monitors the use of any browser . Content Advisor uses ratings systems created by independent ratings boards; for the most part these systems rely on site owners to rate their own site and embed the ratings information in each page . Unfortunately, many sites including some of the raunchiest don t bother to take this step . Content Advisor has one other drawback: its settings apply to all users on a computer, whereas Parental Controls lets an administrator apply separate settings to each standard user . For more information about Content Advisor, see Blocking Objectionable Content, 27 .
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correction in text lists is sometimes much easier in Excel than in Word because corrective text formulas can be used . A list of available text functions (and other function groups) is provided on the CD-ROM under \Materials\Functions.xlsx .
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back methods, you can execute code that resolves the binding problem and allows the application to continue running without throwing an exception .
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INSIDE OUT
View state is a mechanism used by ASP.NET to store user-specific request and response data between page requests. View state data is not stored by the server. Instead, it is saved into the page s view state and sent in the page s response back to the user. When the user makes the next request, the view state is returned with his or her request. When the page processes, ASP.NET pulls the view state from the page and uses it to reset the property values of the page and its controls. This allows ASP.NET to have all the object data between requests without having to store it on the server. The result is a more scalable web server that can handle more requests. Unless it is disabled, view state is part of every ASP.NET page. As an example, suppose a user requests a webpage that allows users to edit their own profile information. When processing the user s request on the server, your application might have to go out to a database and get the user s profile information. Your application then uses this information to set the property values of the data entry fields on the page. When this page is sent to the user, these property value settings are wrapped up and stored in the view state. When the user then clicks a button to submit his or her changes to the server, the user also sends back the view state as part of the postback. ASP.NET uses this view state information to again set the property values of the server controls on the page back to what they were, as part of the request. It then checks to see if any of these values were modified by the user as part of the postback request. Next, suppose there is an issue with processing the page on the server, and therefore the server must return the same page back to the user. In this case, it again wraps the server control state (including any data changed by the user) back into the view state and sends it back to the client. You do not have to write this code; the ASP.NET view state client-side state management feature takes care of it. The Page.ViewState property provides a dictionary object for retaining values between multiple requests for the same page. This object is of the type StateBag. When an ASP.NET page is processed, the current state of the page and its controls is hashed into a string and saved in the page as an HTML hidden field called __ViewState. If the data is too long for a single field (as specified in the Page.MaxPageStateFieldLength property), ASP.NET performs view state chunking to split it across multiple hidden fields. The following code sample demonstrates how view state adds data as a hidden form field within a webpage s HTML.
Figure 2-57. Change the title of the menu to About Joomla Jumpstart.
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multiple developers adding new functionality to the UI, and it promotes a unified appearance. They promote reuse and a clean separation of concerns between the application s horizontal capabilities, such as logging and authentication, and its vertical capabilities, such as business functionality that is specific to the application. This also allows you to more easily manage the dependencies and interactions between application components. They help maintain a separation of roles by allowing different individuals or subteams to focus on a specific task or piece of functionality according to their focus or expertise. In particular, they provide a cleaner separation between the UI and the business logic of the application this means that the UI designer can focus on creating a richer user experience. Composite applications are highly suited to a range of client application scenarios. For example, a composite application is ideal for creating a rich end-user experience over disparate back-end systems. The following illustration shows an example of this type of a composite application.
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