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makes a connection to the database, you have to go all the way to the database server to reach it. This can mean the test execution time is unacceptable. You can fight that issue in various ways. A good solution for accelerating your web test is to deploy your application to a preconfigured web server and test it on that server. We ll deal with this in chapter 11. Another good idea is to prepare a special database for this kind of test, with less data and faster query-execution times. RELIABILITY Are the tests reliable enough You have to pay closer attention to the fact that the functional UI tests depend on the environment in which they re executing. If you re developing and testing on the same database, you re likely to introduce data that will interfere with your test suite. If your tests depend on the company s network architecture, you ll get a false alarm if your network administrator decides to replace an old switch in the server room. You can minimize this kind of problem by using a separate test database for development, manual testing, and automated testing. It may even be a good idea to set up the database every time, as with integration tests. You can minimize network dependency by setting up your hardware test architecture yourself. If it s physically impossible, how about using a virtual server If all else fails, think about putting the UI tests in a periodic-build scenario say, every 2 hours or every night.

Setting Up the Application The key functions of a save-and-resume application can be summarized in three categories. First, the application must be able to work disconnected, thus transparently using a local copy of the back-end database. Next, the application must allow you to review, filter, and reject changes. Finally, the application must allow you to reconnect and submit changes at any time. Figure 10-7 shows the key elements of the architecture.

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RepeaterTest.aspx.cs has a single method that contains code critical to the operation of the Repeater control. In the Page_Load method, the following lines are most important: cn.Open(); Repeater1.DataSource= cmd.ExecuteReader( CommandBehavior.CloseConnection); this.DataBind(); First I open the previously created connection object. Next I set the DataSource property of the Repeater object to the return value from the ExecuteReader method of the SqlCommand object. ExecuteReader returns a DataReader object, and because I specify CommandBehavior.CloseConnection, the connection will be closed when the data reader is closed. Finally, I call DataBind. Once again, without this call, the data won t be bound, and nothing will be displayed in the Repeater control. And again, this code won t be added by the .NET Framework, nor by Visual Studio .NET. Whenever bound data doesn t appear, checking to see that DataBind is actually called (and called at the correct level) is critical.

Figure 10-7: Constituent parts of a disconnected save-and-resume application. At startup, the application loads data either from the local store or from a centralized repository. Applications can determine what route should be taken first according to their own features and requirements. Likewise, they can provide distinct user interface elements to trigger the local and remote downloads independently. The DataSet object is ideal for storing a disconnected database. It can contain multiple, even indexed, tables, as well as relations and constraints. Once rebuilt, the DataSet object is used to populate the user interface, which also provides for editing. In this chapter and in 9 and 11, we examine the various options available for serializing a DataSet object: .NET Framework formatters, the ADO.NET normal form, DiffGrams, and XML serializers. A disconnected application should allow users to accumulate and review changes to the original through several work sessions. This means that the local data store must persist the state of each change and possibly the history of each row. The DataSet object provides for just this situation. The DataSet object is also ideal for gathering all the modified rows to be submitted to the back-end system for permanent updates. The DataSet object has been designed with disconnection in mind and to be used in save-and-resume applications. In saveand-resume scenarios, the serialization of the object is a critical aspect in improving overall client-side performance and efficiency. Creating the Local Data Store The sample application shown in Figure 10-8 is a simple Windows Forms application containing an editable DataGrid control. The grid is bound to a DataSet object that can be obtained by executing a SQL query or by reading a local DiffGram file.

SELENIUM Working with Selenium in a CI environment has its own issues. Starting the Selenium RC server every time to run a test is a bad idea. It takes time; and if you re working with several projects that use Selenium, you ll quickly reach the point where two projects want to start the Selenium RC server on the same port, and the second project is out of luck. The best way to use Selenium RC server is to install it on a machine and let it work constantly. You can start Selenium RC server as a Windows service. That way, it s always ready to perform the tests. To install Selenium RC server as a Windows Service, follow this quick guide:

Using Caching to Improve Performance and Scalability One feature of ASP.NET that can improve the performance and scalability of applications displaying dynamic data is output caching. Say that you add the following line to an aspx page: <%@ OutputCache Duration="20" VaryByParam="None" %> When the page is requested, rather than actually running the underlying code, the page is served up directly from the ASP.NET cache. For pages that are expensive to generate but that don t change frequently, output caching can provide a huge performance benefit. In the example OutputCache directive above, when the page is requested for the first time, the .NET Framework will run whatever code is required to generate the page. Anyone rerunning the page within the next 20 seconds (as specified by the Duration attribute) will get the cached copy rather than a copy created by rerunning the underlying code. The first client to request the page after the 20 seconds have expired will get a newly created copy of the page. Often, a page will be called with one or more parameters, and the parameters might change the content that is displayed. For that common scenario, the VaryByParam attribute allows you to specify a semicolon-delimited list of parameters, or * for all

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