Asp.net mvc 3 带约束的单元测试ASP MVC路由

我的路线定义如下：

routes.MapRoute(
            "Default", // Route name
            "{controller}/{action}/{id}", // URL with parameters
            new { controller = "Home", action = "Index", id = UrlParameter.Optional, area = "" }, // Parameter defaults
            new { home = new HomePageConstraint() }
        );

public class HomePageConstraint : IRouteConstraint
{
    public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection)
    {
        return !httpContext.Request.RawUrl.StartsWith("/home", StringComparison.InvariantCultureIgnoreCase);
    }
}

[Test]
public void Home_Load_Homepage()
{
    "~/".ShouldMapTo<HomeController>(x => x.Index());
}

我试着这样测试它：

routes.MapRoute(
            "Default", // Route name
            "{controller}/{action}/{id}", // URL with parameters
            new { controller = "Home", action = "Index", id = UrlParameter.Optional, area = "" }, // Parameter defaults
            new { home = new HomePageConstraint() }
        );

public class HomePageConstraint : IRouteConstraint
{
    public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection)
    {
        return !httpContext.Request.RawUrl.StartsWith("/home", StringComparison.InvariantCultureIgnoreCase);
    }
}

[Test]
public void Home_Load_Homepage()
{
    "~/".ShouldMapTo<HomeController>(x => x.Index());
}

[测试]
公共无效主页加载主页（）
{
“~/”.ShouldMapTo（x=>x.Index（））；
}

我遇到的问题是

httpContext

为空，因此测试失败。如何将http上下文注入到约束中？

最后我做了以下操作：

var context = new FakeHttpContext("~/");
var fakeRequest = new FakeRequest("~/", new Uri("http://localhost/"), new Uri("http://localhost/"));
context.SetRequest(fakeRequest);

var route = RouteTable.Routes.GetRouteData(context);

route.ShouldMapTo<HomeController>(x => x.Index());

var context=new FakeHttpContext（“~/”）；
var fakeRequest=new fakeRequest（“~/”，新Uri（“http://localhost/“”，新Uri（“”）http://localhost/"));
SetRequest（fakeRequest）；
var route=RouteTable.Routes.GetRouteData（上下文）；
route.ShouldMapTo（x=>x.Index（））；

最后我做到了：

var context = new FakeHttpContext("~/");
var fakeRequest = new FakeRequest("~/", new Uri("http://localhost/"), new Uri("http://localhost/"));
context.SetRequest(fakeRequest);

var route = RouteTable.Routes.GetRouteData(context);

route.ShouldMapTo<HomeController>(x => x.Index());

var context=new FakeHttpContext（“~/”）；
var fakeRequest=new fakeRequest（“~/”，新Uri（“http://localhost/“”，新Uri（“”）http://localhost/"));
SetRequest（fakeRequest）；
var route=RouteTable.Routes.GetRouteData（上下文）；
route.ShouldMapTo（x=>x.Index（））；