Test URL to MVC Controller method

Testing Incoming URL

If you need to test routes, you need to mock three classes from the MVC Framework: HttpRequestBase, HttpContextBase and HttpResponseBase(only for outgoing URL´s)

private HttpContextBase CreateHttpContext(string targetUrl = null, string httpMethod = "GET")
    {
        // create mock request
        Mock<HttpRequestBase> mockRequest = new Mock<HttpRequestBase>();
        // url you want to test through the property 
        mockRequest.Setup(m => m.AppRelativeCurrentExecutionFilePath).Returns(targetUrl);
        mockRequest.Setup(m => m.HttpMethod).Returns(httpMethod);

        // create mock response
        Mock<HttpResponseBase> mockResponse = new Mock<HttpResponseBase>();
        mockResponse.Setup(m => m.ApplyAppPathModifier(It.IsAny<string>())).Returns<string>(s => s);

        // create the mock context, using the request and response
        Mock<HttpContextBase> mockContext = new Mock<HttpContextBase>();
        mockContext.Setup(m => m.Request).Returns(mockRequest.Object);
        mockContext.Setup(m => m.Response).Returns(mockResponse.Object);

        // return the mock context object
        return mockContext.Object;
    }

then you need an additional helper method that let´s you specify the URL to test and the expected segment variables and an object for additional variables.

        private void TestRouteMatch(string url, string controller, string action, 
        object routeProperties = null, string httpMethod = "GET")
    {
        // arrange
        RouteCollection routes = new RouteCollection();
        // loading the defined routes about the Route-Config
        RouteConfig.RegisterRoutes(routes);
        RouteData result = routes.GetRouteData(CreateHttpContext(url, httpMethod));

        // assert
        Assert.IsNotNull(result);
        // here you can check your properties (controller, action, routeProperties) with the result
        Assert.IsTrue(.....);
    }

You don´t need to define your routes in the test methodes, because they were load directly using the RegisterRoutes method in the RouteConfig class.

The mechanism by wich inbound URL matching works.

GetRouteData(HttpContextBase httpContext)

referencesource.microsoft

The framework calls this method for each route table entry, until one of thems returns a non-null value.

You have to call the helper method as example in this way

    [TestMethod]
    public void TestIncomingRoutes() {
        // check for the URL that is hoped for
        TestRouteMatch("~/Home/Index", "Home", "Index");
    }

the method check the URL you expecting as in the example above, call the Index action in the Home controller. You must prefix the URL with tilde (~) this is they way how the ASP.NET Framework presents the URL to the routing system.

In reference to the book Pro ASP.NET MVC 5 by Adam Freeman i can recommand it to every ASP.NET MVC developer!