在 EPiServer 中,有人会如何测试这样的扩展:
public static class LinkItemExtensions
{
public static T GetTypedPage(this LinkItem link) where T : TypedPageData
{
return (T) DataFactory.Instance.GetPage(PageReference.ParseUrl(link.Href));
}
}
我想要做的是用下面的代码以某种方式测试上面的类:
[TestFixture]
public class LinkItemExtensionsTests
{
[Test]
public void GetTypedPage_GivenALinkItem_ReturnsTypedPageData()
{
var link = new LinkItem();
var typedPage = link.GetTypedPage();
Assert.IsAssignableFrom(typeof(StartPageData), typedPage);
}
}
调用 DataFactory.Instance 时会出现问题。
System.TypeInitializationException : The type initializer for 'EPiServer.DataFactory' threw an exception. ----> System.NullReferenceException : Object reference not set to an instance of an object.
因此,我尝试将 DataFactory 的抽象传递给扩展方法,如下所示:
namespace WebTests
{
[TestFixture]
public class PageDataExtensionsTests
{
[Test]
public void GetTypedPage_GivenALinkItem_ReturnsTypedPageData()
{
var link = new LinkItem();
var startPage = A.Fake<StartPageData>();
var pageDataFactory = A.Fake<IDataFactoryFacade>();
A.CallTo(() => pageDataFactory.GetPage(null))
.WithAnyArguments()
.Returns(startPage);
var typedPage = link.GetTypedPage<StartPageData>(pageDataFactory);
Assert.IsAssignableFrom(typeof(StartPageData), typedPage);
}
}
}
我得到
System.InvalidCastException : Unable to cast object of type 'Castle.Proxies.PageDataProxy' to type 'LocalEPiSandbox.Templates.PageTypes.StartPageData'.
你如何处理这个问题?