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Who cares about Domain Rules?

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20 Nov 2006MIT12 min read 95.8K   85   118  
With this article, I am evolving a domain problem towards the best possible solution.
 
using NMock2;

using NUnit.Framework;

namespace BusinessRules.Evolution_Three.Tests
{
    [TestFixture]
    public class IncomeTaxEngineFixture
    {
        private Mockery mocks = null;
        private ICurrentCultureInfo currentCulture = null;
        private IIncomeTaxEngine incomeTaxEngine = 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 ValidateCalculateTaxRateForUsaTaxEngine()
        {
            // Setup expectations for our mock.
            Expect.Once.On(currentCulture).GetProperty("CurrentCultureName").Will(Return.Value("en-US"));

            // Create the instance of the income tax engine
            incomeTaxEngine = IncomeTaxEngine.CreateInstance(currentCulture);

            // Validate the income tax engine works as expected

            Assert.AreEqual(0.10, incomeTaxEngine.CalculateTaxRate(0.0));
            Assert.AreEqual(0.10, incomeTaxEngine.CalculateTaxRate(1500.00));
            Assert.AreEqual(0.10, incomeTaxEngine.CalculateTaxRate(7550.99));

            Assert.AreEqual(0.15, incomeTaxEngine.CalculateTaxRate(7551.00));
            Assert.AreEqual(0.15, incomeTaxEngine.CalculateTaxRate(28000.00));
            Assert.AreEqual(0.15, incomeTaxEngine.CalculateTaxRate(30650.99));

            Assert.AreEqual(0.25, incomeTaxEngine.CalculateTaxRate(30651.00));
            Assert.AreEqual(0.25, incomeTaxEngine.CalculateTaxRate(65000.00));
            Assert.AreEqual(0.25, incomeTaxEngine.CalculateTaxRate(74200.99));

            Assert.AreEqual(0.28, incomeTaxEngine.CalculateTaxRate(74201.00));
            Assert.AreEqual(0.28, incomeTaxEngine.CalculateTaxRate(84526.00));
            Assert.AreEqual(0.28, incomeTaxEngine.CalculateTaxRate(154800.99));

            Assert.AreEqual(0.33, incomeTaxEngine.CalculateTaxRate(154801.00));
            Assert.AreEqual(0.33, incomeTaxEngine.CalculateTaxRate(205456.44));
            Assert.AreEqual(0.33, incomeTaxEngine.CalculateTaxRate(336550.99));

            Assert.AreEqual(0.35, incomeTaxEngine.CalculateTaxRate(336551.00));
            Assert.AreEqual(0.35, incomeTaxEngine.CalculateTaxRate(536551.00));
            Assert.AreEqual(0.35, incomeTaxEngine.CalculateTaxRate(double.MaxValue - 0.01));
        }

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

            // Create the instance of the income tax engine
            incomeTaxEngine = IncomeTaxEngine.CreateInstance(currentCulture);

            // Validate the income tax engine works as expected

            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxLiability(0.0), 2.0);
            Assert.AreEqual(150.00, incomeTaxEngine.CalculateTaxLiability(1500.00), 2.0);
            Assert.AreEqual(755.10, incomeTaxEngine.CalculateTaxLiability(7550.99), 2.0);

            Assert.AreEqual(755.10, incomeTaxEngine.CalculateTaxLiability(7551.00), 2.0);
            Assert.AreEqual(3822.45, incomeTaxEngine.CalculateTaxLiability(28000.00), 2.0);
            Assert.AreEqual(4220.10, incomeTaxEngine.CalculateTaxLiability(30650.99), 2.0);

            Assert.AreEqual(4220.10, incomeTaxEngine.CalculateTaxLiability(30651.00), 2.0);
            Assert.AreEqual(12807.35, incomeTaxEngine.CalculateTaxLiability(65000.00), 2.0);
            Assert.AreEqual(15107.60, incomeTaxEngine.CalculateTaxLiability(74200.99), 2.0);

            Assert.AreEqual(15107.60, incomeTaxEngine.CalculateTaxLiability(74201.00), 2.0);
            Assert.AreEqual(17998.60, incomeTaxEngine.CalculateTaxLiability(84526.00), 2.0);
            Assert.AreEqual(37675.60, incomeTaxEngine.CalculateTaxLiability(154800.99), 2.0);

            Assert.AreEqual(37675.60, incomeTaxEngine.CalculateTaxLiability(154801.00), 2.0);
            Assert.AreEqual(54391.89, incomeTaxEngine.CalculateTaxLiability(205456.44), 2.0);
            Assert.AreEqual(97653.09, incomeTaxEngine.CalculateTaxLiability(336550.99), 2.0);

            Assert.AreEqual(97653.09, incomeTaxEngine.CalculateTaxLiability(336551.00), 2.0);
            Assert.AreEqual(167653.09, incomeTaxEngine.CalculateTaxLiability(536551.00), 2.0);
            Assert.AreEqual(6.2919259720181043E+307, incomeTaxEngine.CalculateTaxLiability(double.MaxValue - 0.01), 2.0);
        }

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

            // Create the instance of the income tax engine
            incomeTaxEngine = IncomeTaxEngine.CreateInstance(currentCulture);

            // Validate the income tax engine works as expected

            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxRate(0.0));
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxRate(1500.00));
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxRate(6000.99));

            Assert.AreEqual(0.15, incomeTaxEngine.CalculateTaxRate(6001.00));
            Assert.AreEqual(0.15, incomeTaxEngine.CalculateTaxRate(22258.32));
            Assert.AreEqual(0.15, incomeTaxEngine.CalculateTaxRate(25000.99));

            Assert.AreEqual(0.30, incomeTaxEngine.CalculateTaxRate(25001.00));
            Assert.AreEqual(0.30, incomeTaxEngine.CalculateTaxRate(65000.00));
            Assert.AreEqual(0.30, incomeTaxEngine.CalculateTaxRate(75000.99));

            Assert.AreEqual(0.40, incomeTaxEngine.CalculateTaxRate(75001.00));
            Assert.AreEqual(0.40, incomeTaxEngine.CalculateTaxRate(84526.00));
            Assert.AreEqual(0.40, incomeTaxEngine.CalculateTaxRate(150000.99));

            Assert.AreEqual(0.45, incomeTaxEngine.CalculateTaxRate(150001.00));
            Assert.AreEqual(0.45, incomeTaxEngine.CalculateTaxRate(205456.44));
            Assert.AreEqual(0.45, incomeTaxEngine.CalculateTaxRate(double.MaxValue - 0.01));
        }

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

            // Create the instance of the income tax engine
            incomeTaxEngine = IncomeTaxEngine.CreateInstance(currentCulture);

            // Validate the income tax engine works as expected

            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxLiability(0.0), 2.0);
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxLiability(1500.00), 2.0);
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxLiability(6000.99), 2.0);

            Assert.AreEqual(0.15, incomeTaxEngine.CalculateTaxLiability(6001.00), 2.0);
            Assert.AreEqual(2438.60, incomeTaxEngine.CalculateTaxLiability(22258.32), 2.0);
            Assert.AreEqual(2850.00, incomeTaxEngine.CalculateTaxLiability(25000.99), 2.0);

            Assert.AreEqual(2850.00, incomeTaxEngine.CalculateTaxLiability(25001.00), 2.0);
            Assert.AreEqual(14849.70, incomeTaxEngine.CalculateTaxLiability(65000.00), 2.0);
            Assert.AreEqual(17850.00, incomeTaxEngine.CalculateTaxLiability(75000.99), 2.0);

            Assert.AreEqual(17850.00, incomeTaxEngine.CalculateTaxLiability(75001.00), 2.0);
            Assert.AreEqual(21660.00, incomeTaxEngine.CalculateTaxLiability(84526.00), 2.0);
            Assert.AreEqual(47850.00, incomeTaxEngine.CalculateTaxLiability(150000.99), 2.0);

            Assert.AreEqual(47850.00, incomeTaxEngine.CalculateTaxLiability(150001.00), 2.0);
            Assert.AreEqual(72804.94, incomeTaxEngine.CalculateTaxLiability(205456.44), 2.0);
            Assert.AreEqual(8.0896191068804208E+307, incomeTaxEngine.CalculateTaxLiability(double.MaxValue - 0.01), 2.0);
        }

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

            // Create the instance of the income tax engine
            incomeTaxEngine = IncomeTaxEngine.CreateInstance(currentCulture);

            // Validate the income tax engine works as expected

            Assert.AreEqual(0.195, incomeTaxEngine.CalculateTaxRate(0.0));
            Assert.AreEqual(0.195, incomeTaxEngine.CalculateTaxRate(9500.00));
            Assert.AreEqual(0.195, incomeTaxEngine.CalculateTaxRate(19500.00));
            Assert.AreEqual(0.195, incomeTaxEngine.CalculateTaxRate(19500.99));

            Assert.AreEqual(0.33, incomeTaxEngine.CalculateTaxRate(19501.00));
            Assert.AreEqual(0.33, incomeTaxEngine.CalculateTaxRate(28000.00));
            Assert.AreEqual(0.33, incomeTaxEngine.CalculateTaxRate(60000.00));
            Assert.AreEqual(0.33, incomeTaxEngine.CalculateTaxRate(60000.99));

            Assert.AreEqual(0.39, incomeTaxEngine.CalculateTaxRate(60001.00));
            Assert.AreEqual(0.39, incomeTaxEngine.CalculateTaxRate(65000.00));
            Assert.AreEqual(0.39, incomeTaxEngine.CalculateTaxRate(999999999.00));
        }

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

            // Create the instance of the income tax engine
            incomeTaxEngine = IncomeTaxEngine.CreateInstance(currentCulture);

            // Validate the income tax engine works as expected

            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxLiability(0.0), 2.0);
            Assert.AreEqual(1852.50, incomeTaxEngine.CalculateTaxLiability(9500.00), 2.0);
            Assert.AreEqual(3802.50, incomeTaxEngine.CalculateTaxLiability(19500.00), 2.0);
            Assert.AreEqual(3802.69, incomeTaxEngine.CalculateTaxLiability(19500.99), 2.0);

            Assert.AreEqual(3802.70, incomeTaxEngine.CalculateTaxLiability(19501.00), 2.0);
            Assert.AreEqual(6607.36, incomeTaxEngine.CalculateTaxLiability(28000.00), 2.0);
            Assert.AreEqual(17167.36, incomeTaxEngine.CalculateTaxLiability(60000.00), 2.0);
            Assert.AreEqual(17167.69, incomeTaxEngine.CalculateTaxLiability(60000.99), 2.0);

            Assert.AreEqual(17167.69, incomeTaxEngine.CalculateTaxLiability(60001.00), 2.0);
            Assert.AreEqual(19117.30, incomeTaxEngine.CalculateTaxLiability(65000.00), 2.0);
            Assert.AreEqual(389993766.91, incomeTaxEngine.CalculateTaxLiability(999999999.00), 2.0);
            Assert.AreEqual(7.0110032259630313E+307, incomeTaxEngine.CalculateTaxLiability(double.MaxValue - 0.01), 2.0);
        }

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

            // Create the instance of the income tax engine
            incomeTaxEngine = IncomeTaxEngine.CreateInstance(currentCulture);

            // Validate the income tax engine works as expected

            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxRate(0.0));
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxRate(9500.00));
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxRate(19500.00));
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxRate(19500.99));

            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxRate(19501.00));
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxRate(28000.00));
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxRate(60000.00));
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxRate(60000.99));

            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxRate(60001.00));
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxRate(65000.00));
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxRate(999999999.00));
        }

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

            // Create the instance of the income tax engine
            incomeTaxEngine = IncomeTaxEngine.CreateInstance(currentCulture);

            // Validate the income tax engine works as expected

            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxLiability(0.0), 2.0);
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxLiability(9500.00), 2.0);
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxLiability(19500.00), 2.0);
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxLiability(19500.99), 2.0);

            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxLiability(19501.00), 2.0);
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxLiability(28000.00), 2.0);
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxLiability(60000.00), 2.0);
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxLiability(60000.99), 2.0);

            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxLiability(60001.00), 2.0);
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxLiability(65000.00), 2.0);
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxLiability(999999999.00), 2.0);
            Assert.AreEqual(0.0, incomeTaxEngine.CalculateTaxLiability(double.MaxValue - 0.01), 2.0);
        }

        /// <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();
        }
    }
}

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This article, along with any associated source code and files, is licensed under The MIT License


Written By
Maruis Marais
Web Developer
New Zealand New Zealand
This member has not yet provided a Biography. Assume it's interesting and varied, and probably something to do with programming.

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Posted 20 Nov 2006

Article Copyright 2006 by Maruis Marais
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