From Mocks to Isolation

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

using NUnit.Framework;

using TypeMock;

using Customers;

namespace UnitTests
{
    [TestFixture]
    public class CarInsuranceTest2_NaturalMocks
    {
        [Test]
        [VerifyMocks]
        public void GetCustomerPriceGroup_Adult_UnableToConnect()
        {
            Customer customer = MockManager.MockObject<Customer>().Object;
            customer.DateOfBirth = new DateTime(1970, 1, 1, 0, 0, 0);

            using (RecordExpectations recorder = new RecordExpectations())
            {
                var dataLayer = new DataLayer();
                recorder.ExpectAndReturn(dataLayer.GetCustomer(0), customer);
            }

            var carInsurance = new CarInsurance();
            PriceGroup priceGroup = carInsurance.GetCustomerPriceGroup(0);
            Assert.AreEqual(PriceGroup.Adult, priceGroup, "Incorrect price group");
        }

        [Test]
        [VerifyMocks]
        public void GetCustomerPriceGroup_Adult()
        {
            Customer customer = MockManager.MockObject<Customer>().Object;
            customer.DateOfBirth = new DateTime(1970, 1, 1, 0, 0, 0);

            using (RecordExpectations recorder = new RecordExpectations())
            {
                var dataLayer = new DataLayer();
                dataLayer.OpenConnection();
                recorder.ExpectAndReturn(dataLayer.GetCustomer(0), customer);
                dataLayer.CloseConnection();
            }

            var carInsurance = new CarInsurance();
            PriceGroup priceGroup = carInsurance.GetCustomerPriceGroup(0);
            Assert.AreEqual(PriceGroup.Adult, priceGroup, "Incorrect price group");
        }
    }
}