No Smiles Dynamic

SmokeTestController.cs

using System;
using System.Dynamic;
using System.Linq;
using System.Web.Mvc;

namespace MvcApplication1.Controllers
{
    public class SmokeTestController : Controller
    {
        private readonly Func<SmokeTestResult>[] smokeTests;

        public SmokeTestController(Func<SmokeTestResult>[] smokeTests)
        {
            this.smokeTests = smokeTests;
        }

        public ActionResult Index()
        {
            dynamic testResults = from test in smokeTests
                                  let result = test()
                                  select new
                                             {
                                                 ClassName = result.GetType().Name.Replace("TestResult", "")
                                             };

            dynamic viewModel = new ExpandoObject();

            viewModel.TestResults = testResults;

            return View(viewModel);
        }
    }

    public class FailureTestResult : SmokeTestResult
    {
    }

    public class SmokeTestResult
    {
    }
}

SmokeTestControllerTests.cs

using System;
using System.Web.Mvc;
using FluentAssertions;
using MvcApplication1.Controllers;

namespace MvcApplication1.Tests
{
    using TestFixture = Microsoft.VisualStudio.TestTools.UnitTesting.TestClassAttribute;
    using Test  = Microsoft.VisualStudio.TestTools.UnitTesting.TestMethodAttribute;

    [TestFixture]
    public class SmokeTestTests
    {
        [Test]
        public void ShouldMakeMeSmile()
        {
            Func<SmokeTestResult> failingTest = () => new FailureTestResult();

            var results = new SmokeTestController(new[] { failingTest }).Index().As<ViewResult>();

            dynamic viewmodel = results.Model;

            viewmodel.TestResults.First().Should().BeEquivalent("failure");
        }
    }
}

Test Runner Output.txt

Test Name:	ShouldMakeMeSmile
Test FullName:	MvcApplication1.Tests.SmokeTestTests.ShouldMakeMeSmile
Test Source:	c:\Users\ryan.cromwell\Documents\Visual Studio 11\Projects\MvcApplication1\MvcApplication1\Tests\SmokeTestTests.cs : line 16
Test Outcome:	Failed
Test Duration:	0:00:00.5489077

Result Message:	
Test method MvcApplication1.Tests.SmokeTestTests.ShouldMakeMeSmile threw exception: 
Microsoft.CSharp.RuntimeBinder.RuntimeBinderException: 'object' does not contain a definition for 'First'
Result StackTrace:	
at CallSite.Target(Closure , CallSite , Object )
   at System.Dynamic.UpdateDelegates.UpdateAndExecute1[T0,TRet](CallSite site, T0 arg0)
   at MvcApplication1.Tests.SmokeTestTests.ShouldMakeMeSmile() in c:\Users\ryan.cromwell\Documents\Visual Studio 11\Projects\MvcApplication1\MvcApplication1\Tests\SmokeTestTests.cs:line 23