Test for compiled linq queries

GivenAVariableTypeToBeQueriedOn.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Nddc.Www.Core.CustomLinq;
using Nddc.Www.Core.Readmodel;
using Nddc.Www.Core.Tests.Factories;
using North51.Commons.Cqrs.ReadModel;
using North51.Commons.Testing;
using NUnit.Framework;
using Rhino.Mocks;

namespace Nddc.Www.Core.Tests.CustomLinq.DynamicQueries
{
    public class GivenAVariableTypeToBeQueriedOn : Specification
    {
        private object all;
        private Type typeToQueryOn;

        protected override void Given()
        {
            base.Given();

            var volunteers = new[]
                             {
                                 VolunteerFactory.NormalVolunteer("Jim", "Finn", new DateTime(1987, 10, 10), false),
                                 VolunteerFactory.NormalVolunteer("Will", "Finn", new DateTime(1982,10,10),false),
                                 VolunteerFactory.NormalVolunteer("Mick", "Finn", new DateTime(1982,10,10),false)
                             };

            Dependency<IReadModelRepository>()
                .Stub(r => r.All<Volunteer>())
                .Return(volunteers);

            this.typeToQueryOn = typeof(Volunteer);
        }

        protected override void When()
        {
            var compiledLinqQuery = typeof(CustomQuery).GetMethod("DynamicQuery").MakeGenericMethod(this.typeToQueryOn).Invoke(null, new object[] { "DateOfBirth.Year >= 1986" });

            var genericAllMethodToInvoke = Dependency<IReadModelRepository>().GetType().GetMethod("All").MakeGenericMethod(this.typeToQueryOn);

            var objectArrayOfVolunteers = (IEnumerable<object>)genericAllMethodToInvoke.Invoke(Dependency<IReadModelRepository>(), null);

            //this is what I am currently trying to fiddle with, I have tried a dynamic[] thing as well without success....
            var castMethod = typeof (Enumerable).GetMethod("Cast").MakeGenericMethod(this.typeToQueryOn);

            var stuff = castMethod.Invoke(null, new[] {objectArrayOfVolunteers});

            //this where won't work
            //var results = stuff.Where(compiledLinqQuery);
        }

        [Test]
        public void ShouldNotBeNull()
        {
            this.all.ShouldNotBeNull();
        }
    }
}