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Catel - Part 4 of n: Unit testing with Catel

, 28 Jan 2011 CPOL
This article explains how to write unit tests for MVVM using Catel.
Catel-04_01-unittesting.zip
src
Catel.Articles.04 - Unit testing
Models
Properties
Settings.settings
Resources
Images
add.png
delete.png
edit.png
group.png
UI
Data
Converters
ViewModels
Windows
Catel.Articles.04 - Unit testing.Test
Models
Properties
UI
ViewModels
Catel.Articles.Base
Data
Attributes
Properties
Settings.settings
Resources
Images
CatenaLogic.png
Preview.png
Run.png
ShowCode.png
UI
Controls
Helpers
ViewModels
Windows
Catel.Core
Attributes
ClassDiagrams
DataObjectBase.cd
SavableDataObjectBase.cd
Collections
Helpers
ComponentModel
Data
Attributes
Exceptions
Interfaces
Diagnostics
Extensions
Helpers
Exceptions
Helpers
IO
Exceptions
IoC
LLBLGen
Log4net
Appender
Extensions
Helpers
MVVM
Commands
Interfaces
Exceptions
Services
EventArgs
Exceptions
Interfaces
ViewModels
Attributes
Interfaces
Properties
Reflection
Exceptions
Extensions
Helpers
Runtime
Serialization
Attributes
Helpers
Security
Cryptography
Helpers
Catel.Examples.Models
Properties
Catel.Examples.PersonApplication
Properties
Settings.settings
Resources
Images
add.png
delete.png
edit.png
group.png
UI
Data
Converters
ViewModels
Windows
Catel.Examples.Silverlight
Properties
Resources
Images
add.png
delete.png
edit.png
group.png
UI
Data
Converters
Pages
ViewModels
Windows
Catel.Examples.Silverlight.Web
Catel.Examples.Silverlight.Web.csproj.user
ClientBin
Properties
Catel.FxCop
Catel.Silverlight
Diagnostics
log4net
Core
MVVM
Commands
Services
ViewModels
Properties
Catel.Core
Catel.Windows
Reflection
Themes
Generic
Assets
Old
Windows
Controls
Data
Converters
Helpers
Helpers
Catel.Silverlight.Test
Properties
Catel.Silverlight.Test.Web
Catel.Silverlight.Test.Web.csproj.user
ClientBin
Properties
Catel.snk
Catel.Templates.WpfApplication
Properties
Settings.settings
UI
Controls
ViewModels
Windows
Catel.Templates.WpfItemTemplates
Properties
UI
Controls
ViewModels
Windows
Catel.Test
Collections
Convert
Data
Helpers
IO
MVVM
UI
ViewModels
Properties
Reflection
Runtime
Serialization
Security
Cryptography
Test References
Catel.Windows.accessor
Windows
Data
Converters
Catel.vsmdi
Catel.Windows
ClassDiagrams
ViewModelBase.cd
Collections
Extensions
Helpers
MVVM
Commands
Services
Test
UI
ViewModels
Properties
Settings.settings
Resources
Images
Add.png
ClearOutput.png
Edit.png
Error.png
Loading.gif
Preview.png
Remove.png
Save.png
TipOfTheDay.png
Warning.png
Themes
Aero
ExpressionDark
Assets
Generic
Assets
Controls
Jetpack
Assets
background.png
Old
SunnyOrange
Assets
Windows
Controls
Extensions
LinkLabel
StackGrid
Data
Converters
Helpers
Documents
Extensions
Extensions
Helpers
Input
Markup
Media
Effects
EmptyEffect
EmptyEffect.fx
EmptyEffect.ps
EmptyEffect.fx
GrayscaleEffect
GrayscaleEffect.fx
GrayscaleEffect.ps
Extensions
Imaging
Extensions
Windows
DataWindow
TipOfTheDay
Local.testsettings
Settings.StyleCop
TraceAndTestImpact.testsettings
// --------------------------------------------------------------------------------------------------------------------
// <copyright file="ViewModelManager.cs" company="Catel development team">
//   Copyright (c) 2008 - 2011 Catel development team. All rights reserved.
// </copyright>
// <summary>
//   Manager for view models. Thanks to this manager, it is possible to subscribe to other view models and be able to respond
//   correctly to property changes in other views.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

using System;
using System.Collections.Generic;
using Catel.Properties;
using log4net;

namespace Catel.MVVM
{
	/// <summary>
	/// Manager for view models. Thanks to this manager, it is possible to subscribe to other view models and be able to respond
	/// correctly to property changes in other views.
	/// </summary>
	public class ViewModelManager
	{
		#region Variables
        /// <summary>
        /// The <see cref="ILog">log</see> object.
        /// </summary>
		private static readonly ILog Log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        /// <summary>
        /// Dictionary containing all the managed view models by this view model manager.
        /// </summary>
		private readonly Dictionary<Type, ManagedViewModel> _managedViewModels = new Dictionary<Type, ManagedViewModel>();
		#endregion

		#region Constructor & destructor
		/// <summary>
		/// Initializes a new instance of the <see cref="ViewModelManager"/> class.
		/// </summary>
		/// <remarks>
		/// The constructor is private because this is a singleton class.
		/// </remarks>
		internal ViewModelManager()
		{
			Log.Debug(TraceMessages.InstantiatedViewModelManager);
		}
		#endregion

		#region Properties
		#endregion

		#region Methods
		/// <summary>
		/// Registers a view model instance with the manager. All view models must register themselves to the manager.
		/// </summary>
		/// <param name="viewModel">The view model to register.</param>
		/// <exception cref="ArgumentNullException">When <paramref name="viewModel"/> is <c>null</c>.</exception>
		internal void RegisterViewModelInstance(IViewModel viewModel)
		{
			RegisterViewModelInstanceInternal(viewModel);
		}

		/// <summary>
		/// Registers a view model instance with the manager. All view models must register themselves to the manager.
		/// </summary>
		/// <param name="viewModel">The view model to register.</param>
		/// <exception cref="ArgumentNullException">When <paramref name="viewModel"/> is <c>null</c>.</exception>
        private void RegisterViewModelInstanceInternal(IViewModel viewModel)
		{
			if (viewModel == null)
			{
			    throw new ArgumentNullException("viewModel");
			}

			var managedViewModel = GetManagedViewModel(viewModel.GetType());
			managedViewModel.AddViewModelInstance(viewModel);
		}

		/// <summary>
		/// Unregisters a view model instance from the manager. All view models must unregister themselves from the manager.
		/// </summary>
		/// <param name="viewModel">The view model to unregister.</param>
		/// <exception cref="ArgumentNullException">When <paramref name="viewModel"/> is <c>null</c>.</exception>
        internal void UnregisterViewModelInstance(IViewModel viewModel)
		{
			UnregisterViewModelInstanceInternal(viewModel);
		}

		/// <summary>
		/// Unregisters a view model instance from the manager. All view models must unregister themselves from the manager.
		/// </summary>
		/// <param name="viewModel">The view model to unregister.</param>
		/// <exception cref="ArgumentNullException">When <paramref name="viewModel"/> is <c>null</c>.</exception>
        private void UnregisterViewModelInstanceInternal(IViewModel viewModel)
		{
			if (viewModel == null)
			{
			    throw new ArgumentNullException("viewModel");
			}

			var managedViewModel = GetManagedViewModel(viewModel.GetType());
			managedViewModel.RemoveViewModelInstance(viewModel);
		}

		/// <summary>
        /// Adds an interested view model instance. The <see cref="IViewModel"/> class will automatically register
		/// itself to the manager by using this method when decorated with the <see cref="InterestedInAttribute"/>.
		/// </summary>
		/// <param name="viewModelType">Type of the view model the <paramref name="viewModel"/> is interested in.</param>
		/// <param name="viewModel">The view model instance.</param>
		/// <exception cref="ArgumentNullException">When <paramref name="viewModelType"/> is <c>null</c>.</exception>
		/// <exception cref="ArgumentNullException">When <paramref name="viewModel"/> is <c>null</c>.</exception>
        internal void AddInterestedViewModel(Type viewModelType, IViewModel viewModel)
		{
			AddInterestedViewModelInstanceInternal(viewModelType, viewModel);
		}

		/// <summary>
        /// Adds an interested view model instance. The <see cref="IViewModel"/> class will automatically register
		/// itself to the manager by using this method when decorated with the <see cref="InterestedInAttribute"/>.
		/// </summary>
		/// <param name="viewModelType">Type of the view model the <paramref name="viewModel"/> is interested in.</param>
		/// <param name="viewModel">The view model instance.</param>
		/// <exception cref="ArgumentNullException">When <paramref name="viewModelType"/> is <c>null</c>.</exception>
		/// <exception cref="ArgumentNullException">When <paramref name="viewModel"/> is <c>null</c>.</exception>
        private void AddInterestedViewModelInstanceInternal(Type viewModelType, IViewModel viewModel)
		{
			if (viewModel == null)
			{
			    throw new ArgumentNullException("viewModel");
			}

			var managedViewModel = GetManagedViewModel(viewModelType);
			managedViewModel.AddInterestedViewModel(viewModel);
		}

		/// <summary>
        /// Removes an interested view model instance. The <see cref="IViewModel"/> class will automatically unregister
		/// itself from the manager by using this method when decorated with the <see cref="InterestedInAttribute"/>.
		/// </summary>
		/// <param name="viewModelType">Type of the view model the <paramref name="viewModel"/> was interested in.</param>
		/// <param name="viewModel">The view model instance.</param>
		/// <exception cref="ArgumentNullException">When <paramref name="viewModelType"/> is <c>null</c>.</exception>
		/// <exception cref="ArgumentNullException">When <paramref name="viewModel"/> is <c>null</c>.</exception>
        internal void RemoveInterestedViewModelInstance(Type viewModelType, IViewModel viewModel)
		{
			RemoveInterestedViewModelInstanceInternal(viewModelType, viewModel);
		}

		/// <summary>
        /// Removes an interested view model instance. The <see cref="IViewModel"/> class will automatically unregister
		/// itself from the manager by using this method when decorated with the <see cref="InterestedInAttribute"/>.
		/// </summary>
		/// <param name="viewModelType">Type of the view model the <paramref name="viewModel"/> was interested in.</param>
		/// <param name="viewModel">The view model instance.</param>
		/// <exception cref="ArgumentNullException">When <paramref name="viewModelType"/> is <c>null</c>.</exception>
		/// <exception cref="ArgumentNullException">When <paramref name="viewModel"/> is <c>null</c>.</exception>
        private void RemoveInterestedViewModelInstanceInternal(Type viewModelType, IViewModel viewModel)
		{
			if (viewModelType == null)
			{
			    throw new ArgumentNullException("viewModelType");
			}

			if (viewModel == null)
			{
			    throw new ArgumentNullException("viewModel");
			}

			var managedViewModel = GetManagedViewModel(viewModelType);
			managedViewModel.RemoveInterestedViewModel(viewModel);
		}

		/// <summary>
		/// Gets the managed view model for a specific view model type.
		/// </summary>
		/// <param name="viewModelType">Type of the view model.</param>
		/// <returns>The <see cref="ManagedViewModel"/> of the specified type.</returns>
		private ManagedViewModel GetManagedViewModel(Type viewModelType)
		{
			lock (_managedViewModels)
			{
				if (!_managedViewModels.ContainsKey(viewModelType))
				{
					_managedViewModels.Add(viewModelType, new ManagedViewModel(viewModelType));
				}

				return _managedViewModels[viewModelType];
			}
		}
		#endregion
	}
}

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About the Author

Geert van Horrik
Software Developer CatenaLogic
Netherlands Netherlands
I am Geert van Horrik, and I have studied Computer Science in the Netherlands.
 
I love to write software using .NET (especially the combination of WPF and C#). I am also the lead developer of Catel, an open-source application development framework for WPF, Silverlight, WP7 and WinRT with the focus on MVVM.
 
I have my own company since January 1st 2007, called CatenaLogic. This company develops commercial and non-commercial software.
 
To download (or buy) applications I have written, visit my website: http://www.catenalogic.com
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