Mock Objects

/* The Test - Taken from 'http://dimecasts.net/Content/WatchEpisode/12' and re-written in 'AAA' syntax from Record and Playback. */
    [TestClass]
    public class UnitTest1
    {
        [TestMethod]
        public void EmailerServiceTest()
        {
            //Arrange
            var emailerService = MockRepository.GenerateMock<IEmailerService>();
            emailerService.Expect(x => x.SendEmail("", "")).IgnoreArguments().Return(true).Repeat.Any();

            //Act
            var emailer = new Emailer(emailerService);
            emailer.SendBatchEmails();

            //Assert                                                 Call ignore arguments becasue you don't care what they are
            emailerService.AssertWasCalled(x => x.SendEmail("", ""), y => y.IgnoreArguments());
            emailerService.VerifyAllExpectations();
        }


        [TestMethod, ExpectedException(typeof(Exception))]
        public void EmailerServiceTestException()
        {

            //Arrange
            var emailerService = MockRepository.GenerateMock<IEmailerService>();
            emailerService.Expect(x => x.SendEmail("", "")).IgnoreArguments().Return(false);

            //Act
            var emailer = new Emailer(emailerService);
            emailer.SendBatchEmails();
            //emailerService.AssertWasNotCalled(x => x.SendEmail("", ""), y => y.IgnoreArguments());
        }
    }

//The Class

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TestLib
{

    public interface IEmailerService
    {
        bool SendEmail(string email, string message);
    }

    public class EmailerService
    {
        public bool SendEmail(string email, string message)
        {
            return false;
        }
    }

    public class Emailer
    {
        private IEmailerService _emailerService;
        public Emailer(IEmailerService emailerService)
        {
            this._emailerService = emailerService;
        }

        public void SendBatchEmails()
        {
            var emails = new Dictionary<string, string>
                            {
                                {"[email protected]", "Hello1"},
                                {"[email protected]", "Hello2"},
                                {"[email protected]", "Hello3"},
                                {"[email protected]", "Hello4"}
                            };
            foreach(KeyValuePair<string, string> email in emails)
            {
                if(!_emailerService.SendEmail(email.Key, email.Value))
                {
                    throw new Exception(" You've Err'd");
                }
            }
        }
    }
}