[TestClass]
    public class ServiceTestFixtures
    {
        [TestMethod]
        public void IsCorrectChange()
        {
            IService service = new Service();
            var mockChangeCalculator = new Moq.Mock<IChangeCalculator>();
            mockChangeCalculator.SetupProperty(client => client.Cost, 1552.55M).SetupProperty(client => client.PaymentReceived, 2000M);

            DataTable t1 = service.GetDataTableChange(mockChangeCalculator.Object);
            DataTable t2 = BuildExpectedTable();

            Assert.IsNotNull(t1);
            Assert.AreEqual(t1.Rows.Count, t2.Rows.Count);

            for (int i = 0; i <= 5; i++)
            {
                Assert.AreEqual(t1.Rows[i][0], t2.Rows[i][0]);
                Assert.AreEqual(t1.Rows[i][1], t2.Rows[i][1]);
            }
        }

        public DataTable BuildExpectedTable()
        {
            DataTable dt = new DataTable();
            //Add column names to datatable
            dt.Columns.Add("Currency", typeof(string));
            dt.Columns.Add("Quantity", typeof(decimal));
            dt.Rows.Add("£50.00", 8);
            dt.Rows.Add("£20.00", 2);
            dt.Rows.Add("£5.00", 1);
            dt.Rows.Add("£2.00", 1);
            dt.Rows.Add("£0.20", 2);
            dt.Rows.Add("£0.05", 1);
            return dt;
        }

        [TestMethod]
        public void IsEnoughMoneyTestFixture()
        {
            var mockChangeCalculator = new Moq.Mock<IChangeCalculator>();
            mockChangeCalculator.SetupProperty(client => client.Cost, 3.52M).SetupProperty(client => client.PaymentReceived, 4M);
            IService service = new Service();
            var EnoughMoney = service.EnoughMoney(mockChangeCalculator.Object);
            Assert.AreEqual(EnoughMoney, true);
        }

        [TestMethod]
        public void NotIsEnoughMoneyTestFixture()
        {
            var mockChangeCalculator = new Moq.Mock<IChangeCalculator>();
            mockChangeCalculator.SetupProperty(client => client.Cost, 4M).SetupProperty(client => client.PaymentReceived, 3.52M);
            IService service = new Service();
            var EnoughMoney = service.EnoughMoney(mockChangeCalculator.Object);
            Assert.AreEqual(EnoughMoney, false);
        }
    }