目前我正在使用Scott Hanselman的HTTP上下文模拟来进行单元测试。这对于MVC 3效果很好,从未后悔过,我用它来测试以下代码。
public class PartialViewRenderer : IPartialViewRenderer
{
public string Render(Controller controller, string viewName, object model)
{
if (string.IsNullOrEmpty(viewName))
viewName = controller.ControllerContext.RouteData.GetRequiredString("action");
controller.ViewData.Model = model;
using (StringWriter sw = new StringWriter())
{
ViewEngineResult viewResult = ViewEngines.Engines.FindPartialView(controller.ControllerContext, viewName);
ViewContext viewContext = new ViewContext(controller.ControllerContext, viewResult.View,
controller.ViewData, controller.TempData, sw);
viewResult.View.Render(viewContext, sw);
return sw.GetStringBuilder().ToString();
}
}
}
当我第一次将我的应用程序转换为MVC 4时,遇到了问题,它会出现运行时异常。因此,我尝试着去修复需要修复的内容,这让我改变了Hanselmans MockHelpers上面的以下方法:(基本上是改变了HttpContext.Items的返回方式,因为它会抛出“null”的异常)
public static HttpContextBase FakeHttpContext()
{
var context = new Mock<HttpContextBase>();
var request = new Mock<HttpRequestBase>();
var response = new Mock<HttpResponseBase>();
var session = new Mock<HttpSessionStateBase>();
var server = new Mock<HttpServerUtilityBase>();
var cookies = new HttpCookieCollection();
var items = new ListDictionary();
request.Setup(r => r.Cookies).Returns(cookies);
response.Setup(r => r.Cookies).Returns(cookies);
context.Setup(ctx => ctx.Items).Returns(items);
context.SetupGet(ctx => ctx.Request).Returns(request.Object);
context.SetupGet(ctx => ctx.Response).Returns(response.Object);
context.SetupGet(ctx => ctx.Session).Returns(session.Object);
context.SetupGet(ctx => ctx.Server).Returns(server.Object);
return context.Object;
}
public static void SetFakeControllerContext(this Controller controller, RouteData route)
{
var httpContext = FakeHttpContext();
ControllerContext context = new ControllerContext(new RequestContext(httpContext, route), controller);
controller.ControllerContext = context;
}
这里是一个非常简单的nUnit测试,我要试图确定我需要对这个模拟的http上下文做出哪些更改(我甚至还没有放入断言)。
[Test]
public void test()
{
_contactsController = _container.Resolve<ContactsController>();
var route = new RouteData();
route.Values.Add("controller", "ContactsController");
route.Values.Add("action", "GetEditContactDetailsDialog");
_contactsController.SetFakeControllerContext(route);
var result = _contactsController.GetEditContactDetailsDialog("1");
}
当我运行这个测试时,它在ViewEngineResult viewResult = ViewEngines.Engines.FindPartialView(controller.ControllerContext, viewName);
的 PartialViewRenderer.Render 调用上失败了。以下是堆栈跟踪信息。
at System.Web.WebPages.DisplayModeProvider.<.ctor>b__2(HttpContextBase context) at System.Web.WebPages.DefaultDisplayMode.CanHandleContext(HttpContextBase httpContext) at System.Web.WebPages.DisplayModeProvider.<>c__DisplayClass6.b__5(IDisplayMode mode) at System.Linq.Enumerable.WhereListIterator
1.MoveNext() at System.Collections.Generic.List
1..ctor(IEnumerable1 collection) at System.Linq.Enumerable.ToList[TSource](IEnumerable
1 source) at System.Web.WebPages.DisplayModeProvider.GetAvailableDisplayModesForContext(HttpContextBase httpContext, IDisplayMode currentDisplayMode) at System.Web.Mvc.VirtualPathProviderViewEngine.GetPath(ControllerContext controllerContext, String[] locations, String[] areaLocations, String locationsPropertyName, String name, String controllerName, String cacheKeyPrefix, Boolean useCache, String[]& searchedLocations)
看起来我无法进入并模拟 DisplayModeProvider。根据 MVC 源代码,有人有解决此问题的方法吗?我一直无法在任何地方找到解决方案。