Base for a repository demo test with Simple.Data.FakeResult

gistfile1.cs

using System;
using System.Collections.Generic;
using FakeItEasy;
using NUnit.Framework;
using Simple.Data.FakeResult;

namespace TestingWithSimpleDataFakeResult
{
    [TestFixture]
    public class RepositoryUsingSimpleDataTests
    {
        [Test]
        public void should_return_faked_data_when_calling_repository()
        {
            // Arrange
            dynamic fakeResult = FakeResult.For.Users.All().OrderByScore().Take().Returns(GetTestResultUsers());
            var dbFactory = A.Fake<ISimpleDataDbFactory>();

            // This next line runs into problem since dynamic doesn't play nicely with extensions methods
            // 
            /*
             *Error	1	'FakeItEasy.Configuration.IAnyCallConfigurationWithReturnTypeSpecified<System.Collections.Generic.IList<TestingWithSimpleDataFakeResult.User>>' 
             *has no applicable method named 'Returns' but appears to have an extension method by that name. 
             *Extension methods cannot be dynamically dispatched. 
             *Consider casting the dynamic arguments or calling the extension method without the extension method syntax.
 
             */
            A.CallTo(dbFactory).WithReturnType<dynamic>().Returns(fakeResult);
            
            var repositoryUnderTest = new UserRepository(dbFactory);

            // Act
            var result = repositoryUnderTest.GetTopUsers();

            // Assert
            Assert.AreEqual(3, result.Count());
        }

        private IList<User> GetTestResultUsers()
        {
            return new List<User>
                       {
                           new User { Name = "Marcus", Score = 3000},
                           new User { Name = "Albert", Score = 30000},
                           new User { Name = "The Gu", Score = 4500},
                       };
        }
    }

    public class UserRepository
    {
        private readonly ISimpleDataDbFactory _dbFactory;

        public UserRepository(ISimpleDataDbFactory dbFactory)
        {
            _dbFactory = dbFactory;
        }

        public IList<User> GetTopUsers()
        {
            return _dbFactory.DB.Users.All().OrderByScore().Take(3).ToList();
        }
    }

    public interface ISimpleDataDbFactory
    {
        dynamic DB { get; }
    }

    public class User
    {
        public string Name { get; set; }
        public int Score { get; set; }
    }
}