Implementing Model-View-Presenter in ASP.NET

using System;
using System.Data;
using Model;
using Model.Data.Interfaces;
using Presentation.Interfaces;
using Rhino.Mocks;
using NUnit.Framework;
using Rhino.Mocks.Constraints;

namespace Presentation.Tests
{
	[TestFixture]
	public class ProductsPresenterFixture
	{
		MockRepository mocks = null;
		ProductsPresenter presenter = null;
		IProductsView view = null;
		IDomainDAO<IProduct> model = null;
		int productID;
		int eventProductID;
		IDataReader dataReader = null;

		[SetUp]
		public void SetUp()
		{
			mocks = new MockRepository();
			view = mocks.DynamicMock<IProductsView>();
			model = mocks.DynamicMock<IDomainDAO<IProduct>>();
			productID = 1;
			eventProductID = 0;
			dataReader = mocks.DynamicMock<IDataReader>();

			presenter = new ProductsPresenter(view, model);
		}

		[TearDown]
		public void TestCleanup()
		{
		}

		[Test]
		[ExpectedException(typeof(ArgumentNullException))]
		public void NullViewShouldThrowArgumentNullException()
		{
			presenter = new ProductsPresenter(null,model);
		}

		[Test]
		[ExpectedException(typeof(ArgumentNullException))]
		public void NullModelwShouldThrowArgumentNullException()
		{
			presenter = new ProductsPresenter(view, null);
		}

		[Test]
		public void InitViewShouldSetProductsAndRefreshTimeOnView()
		{
			SetUpInitView();

			presenter.InitView(false);

			mocks.VerifyAll();
		}
		
		[Test]
		public void InitViewShouldAlwaysSetRefreshTimeOnView()
		{
			SetUpInitView();

			presenter.InitView(false);
			presenter.InitView(true);

			mocks.VerifyAll();
		}

		private void SetUpInitView()
		{
			view.SetProducts(dataReader);
			LastCall.Constraints(Is.TypeOf(typeof(IDataReader)) && Is.NotNull());
			SetupResult.For(model.FetchAllByName(true)).Return(dataReader);

			view.SetRefreshTime(DateTime.Now);
			LastCall.Constraints(Is.TypeOf(typeof(DateTime)) && Is.NotNull());

			mocks.ReplayAll();
		}

		[Test]
		public void UpdateProductDetailsShouldSetProductDetailsOnView()
		{
			IProduct product = mocks.DynamicMock<IProduct>();
			SetupResult.For(model.FetchByID(productID.ToString())).Return(product);
			view.SetProductDetails(product);
			LastCall.Constraints(Is.TypeOf(typeof (IProduct)) && Is.NotNull());

			mocks.ReplayAll();

			presenter.UpdateProductDetails(productID.ToString());

			mocks.VerifyAll();
		}

		[Test]
		public void EditProductShouldRaiseRequestProductEditEvent()
		{
			presenter.RequestProductEdit += new EventHandler<SingleValueEventArgs<int>>(RequestProductEditListener);
			
			Assert.AreEqual(0, eventProductID);
			presenter.EditProduct(productID);
			Assert.AreEqual(1, eventProductID);
		}

		private void RequestProductEditListener(object sender, SingleValueEventArgs<int> e)
		{
			eventProductID = e.Value;
		}
	}
}