Who cares about Domain Rules?

using NMock2;

using NUnit.Framework;

namespace BusinessRules.Evolution_Four.Tests
{
    [TestFixture]
    public class IncomeTaxEngineCreationFixture
    {
        private Mockery mocks = null;
        private ICurrentCultureInfo currentCulture = null;

        /// <summary>
        /// The Setup method is called before each test method is called. 
        /// </summary>
        [SetUp]
        public void Setup()
        {
            mocks = new Mockery();
            currentCulture = mocks.NewMock<ICurrentCultureInfo>();
        }

        [Test]
        public void ShouldReturnNewZealandIncomeTaxEngine()
        {
            // Setup expectations for our mock.
            Expect.Once.On(currentCulture).GetProperty("CurrentCultureName").Will(Return.Value("en-NZ"));

            // Execute the behavior
            IIncomeTaxEngine taxEngine = IncomeTaxEngine.CreateInstance(currentCulture);

            // Validate the results is as expected
            Assert.IsNotNull(taxEngine);
            Assert.IsInstanceOfType(typeof (NewZealandIncomeTaxEngine), taxEngine);
        }

        [Test]
        public void ShouldReturnAustralianIncomeTaxEngine()
        {
            // Setup expectations for our mock.
            Expect.Once.On(currentCulture).GetProperty("CurrentCultureName").Will(Return.Value("en-AU"));

            // Execute the behavior
            IIncomeTaxEngine taxEngine = IncomeTaxEngine.CreateInstance(currentCulture);

            // Validate the results is as expected
            Assert.IsNotNull(taxEngine);
            Assert.IsInstanceOfType(typeof (AustralianIncomeTaxEngine), taxEngine);
        }

        [Test]
        public void ShouldReturnUsaTaxIncomeTaxEngine()
        {
            // Setup expectations for our mock.
            Expect.Once.On(currentCulture).GetProperty("CurrentCultureName").Will(Return.Value("en-US"));

            // Execute the behavior
            IIncomeTaxEngine taxEngine = IncomeTaxEngine.CreateInstance(currentCulture);

            // Validate the results is as expected
            Assert.IsNotNull(taxEngine);
            Assert.IsInstanceOfType(typeof (UsaIncomeTaxEngine), taxEngine);
        }

        [Test]
        public void ShouldReturnNullIncomeTaxEngine()
        {
            // Setup expectations for our mock.
            Expect.Once.On(currentCulture).GetProperty("CurrentCultureName").Will(Return.Value("en-ZA"));

            // Execute the behavior
            IIncomeTaxEngine taxEngine = IncomeTaxEngine.CreateInstance(currentCulture);

            // Validate the results is as expected
            Assert.IsNotNull(taxEngine);
            Assert.IsInstanceOfType(typeof (NullIncomeTaxEngine), taxEngine);
        }

        /// <summary>
        /// The Teardown method is called after each test method is called. 
        /// So we validate all the expectations have been met.
        /// </summary>
        [TearDown]
        public void Teardown()
        {
            mocks.VerifyAllExpectationsHaveBeenMet();
        }
    }
}