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Next, we will add code to the GetConnectionString1() function to retrieve the connection string value from the ConnectionStrings.xml file: private static string GetConnectionString1() { string featureDir = @"C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\TEMPLATE\FEATURES\ VisualWebPartExternalDatabase_Feature1\VisualWebPart1\"; XElement xEl = XElement.Load(featureDir + "ConnectionStrings.xml"); XElement xElConnection = (from x in xEl.Elements("add") where (string)x.Attribute("name") == "AdventureWorks" select x).First(); return xElConnection.Attribute("connectionString").Value; } This function is relatively simple, and uses LINQ to XML to load the ConnectionStrings.xml file from the feature directory it is deployed to, extracts the connection string information, and returns it.

This chapter covered the big concerns, such as scalability and performance, that continue to drive the need to seek out techniques to make websites faster in high-load situations. I explained several scenarios where scalability intersects with performance and demands that you implement a plan to distribute the content and load in a way that is manageable from the perspectives of the network, web servers, and database servers. Having the ability to change the distribution of the data and the software with simple configuration changes will enable a highly agile environment that can adapt to your growing needs so you can address performance issues when they start to reveal themselves.

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One of the practical challenges of unit testing is that, as your test suite grows larger and larger, you can easily acquire many tests that are hard to read and maintain. You ll find yourself asking, What behavior is this test trying to express or, Is it an accurate and minimal representation of the desired behavior or, Is this behavior still applicable To avoid becoming a productivity drain, each test in the suite must be named clearly and implemented succinctly. To make our unit tests easier to understand at a glance, we ll build up a small library of static methods that enable a readable ASP.NET MVC unit testing syntax. The first one, an extension method on all object types, is very general in purpose. Add the following class to your SportsStore.UnitTests project:

public static class UnitTestHelpers { public static void ShouldEqual<T>(this T actualValue, T expectedValue) { Assert.AreEqual(expectedValue, actualValue); } }

Note The connection strings stored in ConnectionStrings.xml are exactly in the same format that they would be found in a web.config file of an ASP.NET application. This makes it convenient to copy and paste connection strings from your .NET application into your SharePoint 2010 web part.

To hold the first unit test, create a new class called CatalogBrowsing in your SportsStore.UnitTests project. The first test will say that users can retrieve a single page of products from the entire catalog.

Listing A-1. Configuration < xml version="1.0" > <configuration> <configSections> <section name="photoAlbumService" type="05.PhotoAlbumProvider.PhotoAlbumSection, 05.PhotoAlbumProvider"/> </configSections> <appSettings> <!-- Flickr Settings http://www.flickr.com/services/api/ --> <add key="FlickrFeedUrlFormat" value="http://api.flickr.com/services/feeds/photos_public.gne tags={0} &format={1}"/> </appSettings> <connectionStrings> <add name="chpt5" connectionString="Data Source=.\SQLEXPRESS; Initial Catalog=05;Integrated Security=True" providerName="System.Data.SqlClient"/> </connectionStrings> <system.web> <!-- Web Settings--> </system.web> <photoAlbumService defaultProvider="SqlPhotoAlbumProvider"> <providers> <clear/> <add name="SqlPhotoAlbumProvider" connectionStringName="chpt5" type="05.PhotoAlbumProvider.SqlPhotoAlbumProvider, 05.PhotoAlbumProvider"/>

When choosing names for our unit tests, we ll follow the BDD idea of trying to describe a behavior in business terms so for example, our first test will be called Can_View_A_Single_Page_Of_Products. Note how this differs from the older, TDD-style naming convention, which typically describes an implementation (e.g., ListAction_RendersViewWithModelContainingRequestedProductInstances). Naming tests in business terms makes it easier to remember why you wrote each of them so that, as business requirements evolve over time, you can quickly decide whether each test is still relevant and which ones need to be updated.

[TestFixture] public class CatalogBrowsing { [Test] public void Can_View_A_Single_Page_Of_Products() { // Arrange: If there are 5 products in the repository... IProductsRepository repository = UnitTestHelpers.MockProductsRepository( new Product { Name = "P1" }, new Product { Name = "P2" }, new Product { Name = "P3" }, new Product { Name = "P4" }, new Product { Name = "P5" } ); var controller = new ProductsController(repository); controller.PageSize = 3; // This property doesn't yet exist, but by // accessing it, you're implicitly forming // a requirement for it to exist // Act: ... then when the user asks for the second page (PageSize=3)... var result = controller.List(2); // Assert: ... they'll just see the last two products. var displayedProducts = (IList<Product>)result.ViewData.Model; displayedProducts.Count.ShouldEqual(2); displayedProducts[0].Name.ShouldEqual("P4"); displayedProducts[1].Name.ShouldEqual("P5"); } }

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