Jeffrey Palermo 2:44 am on March 22, 2008  

So much easier to test plain ASP.NET MVC controllers!!

I was having a hard time easily testing controller classes with the MVC Framework December CTP.  Now it’s easier.  For some background, I’m writing ASP.NET MVC in Action for Manning, so I’m going through all kinds of scenarios, and in the first chapter with the tiny little Hello World samples, it’s now easier to test these.  Consider the following controller:

 

using System.Web.Mvc;
 
namespace MvcApplication.Controllers
{
    public class HelloWorld1Controller : IController
    {
        public void Execute(ControllerContext controllerContext)
        {
            controllerContext.HttpContext.Response.Write(
                "<h1>Hello World1</h1>");
        }
    }
}

 

And here’s my unit test:

 

using MvcApplication.Controllers;
using NUnit.Framework;
using NUnit.Framework.SyntaxHelpers;
 
namespace MvcApplicationTest.Controllers
{
    [TestFixture]
    public class HelloWorld1ControllerTester
    {
        [Test]
        public void ShouldRender()
        {
            var response = new ResponseWriteStub();
            var contextStub = new HttpContextStub(response);
            var controller = new HelloWorld1Controller();
 
            controller.Execute(new ControllerContextStub(controller, contextStub));
 
            Assert.That(response.ActualWritten, Is.EqualTo("<h1>Hello World1</h1>"));
        }
    }
}

 

Pretty darned simple.  Below are my stub classes.

 

 

using System.Web;
using System.Web.Mvc;
using System.Web.Routing;
 
namespace MvcApplicationTest
{
    public class ControllerContextStub : ControllerContext
    {
        public ControllerContextStub(IController controller)
            : base(new RequestContext(new HttpContextStub(), new RouteData()), controller)
        {
        }
 
        public ControllerContextStub(IController controller, HttpContextBase contextBase)
            : base(new RequestContext(contextBase, new RouteData()), controller)
        {
        }
    }
}

 

 

using System.Web;
 
namespace MvcApplicationTest
{
    public class HttpContextStub : HttpContextBase
    {
        private readonly HttpResponseBase _response;
 
        public HttpContextStub(HttpResponseBase response)
        {
            _response = response;
        }
 
        public HttpContextStub()
        {
            
        }
 
        public override HttpResponseBase Response
        {
            get { return _response; }
        }
    }
}

 

 

using System.Web;
 
namespace MvcApplicationTest.Controllers
{
    public class ResponseWriteStub : HttpResponseBase
    {
        public string ActualWritten;
 
        public override void Write(string s)
        {
            ActualWritten = s;
        }
    }
}