c# - 在单元测试期间呈现 View - ControllerContext.DisplayMode

Question

我正在开发一个生成大型复杂报告的 ASP.NET MVC 4 Web 应用程序。我想编写渲染 View 的单元测试，以确保 View 不会因模型而崩溃:

 [Test]
 public void ExampleTest(){                  
     var reportModel = new ReportModel();

     var reportHtml = RenderRazorView(
           @"..\..\Report.Mvc\Views\Report\Index.cshtml", 
           reportModel);

     Assert.IsFalse(
         string.IsNullOrEmpty(reportHtml),
         "View Failed to Render!");          
 }

 public string RenderRazorView(string viewPath, object model){
    //WHAT GOES HERE?
 }

我在网络上看到了很多关于这个的信息，但它要么反对测试 vies，要么只能在网络请求的上下文中使用。

• 反对 - Unit Testing the Views? - 结论是 View 中应该没有逻辑，因此您只需要测试编译。我认为测试 View 以确保不存在空引用异常、显示正确的部分等是有值(value)的。
• Web 请求的上下文 - Render a view as a string - 这是为了呈现要在电子邮件中发送的 View 。但这种方法需要通过网络请求(即有效的 HttpContextBase)调用。

我一直在努力适应Render a view as a string使用 Mocked HttpContextBase，但在使用 Mocked ControllerContext 时遇到问题:

Object reference not set to an instance of an object. at System.Web.WebPages.DisplayModeProvider.GetDisplayMode(HttpContextBase context) at System.Web.Mvc.ControllerContext.get_DisplayMode() at System.Web.Mvc.VirtualPathProviderViewEngine.GetPath(ControllerContext controllerContext, String[] locations, String[] areaLocations, String locationsPropertyName, String name, String controllerName, String cacheKeyPrefix, Boolean useCache, String[]& searchedLocations)

这是我目前的代码:

    public string RenderRazorView(string viewPath, object model)
    {
        var controller = GetMockedDummyController();

        //Exception here
        var viewResult = 
            ViewEngines.Engines.FindView(controller.ControllerContext, "Index", "");

        using (var sw = new StringWriter())
        {
            var viewContext =
                new ViewContext(
                    controller.ControllerContext,
                    viewResult.View,
                    new ViewDataDictionary(model),
                    new TempDataDictionary(),
                    sw);

            viewResult.View.Render(viewContext, sw);

            return sw.ToString();
        }
    }

我正在构建 Controller :

    private Controller GetMockedDummyController()
    {
        var HttpContextBaseMock = new Mock<HttpContextBase>();
        var HttpRequestMock = new Mock<HttpRequestBase>();
        var HttpResponseMock = new Mock<HttpResponseBase>();
        HttpContextBaseMock.SetupGet(x => x.Request).Returns(HttpRequestMock.Object);
        HttpContextBaseMock.SetupGet(x => x.Response).Returns(HttpResponseMock.Object);

        var controller = new DummyController();

        var routeData = new RouteData();
        routeData.Values.Add("controller", "Dummy");

        controller.ControllerContext = 
            new ControllerContext(
                HttpContextBaseMock.Object,
                routeData,
                controller);

        controller.Url =
            new UrlHelper(
                new RequestContext(
                    HttpContextBaseMock.Object,
                    routeData), 
                new RouteCollection());

        return controller;
    }

DummyController 只是public class DummyController : Controller {}

问题

给出一个 View 的路径，我怎样才能将它从一个测试项目渲染成 HTML？或者更具体地说，如何模拟 ControllerContext.DisplayMode？

Answer 1

假设您完全分离关注点，是否有必要实例化 Controller ？如果没有，那么也许您可以使用 RazorEngine测试你的观点。

var contents = File.ReadAllText("pathToView"); 
var result = Razor.Parse(contents,model);
// assert here