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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="ViewModelServiceManager.cs" company="Catel development team">
//   Copyright (c) 2008 - 2011 Catel development team. All rights reserved.
// </copyright>
// <summary>
//   Class that manages services available to view models.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

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

namespace Catel.MVVM.Services
{
	/// <summary>
	/// Class that manages services available to view models.
	/// </summary>
	public class ViewModelServiceManager : IServiceProvider
	{
		#region Variables
        /// <summary>
        /// Dictionary of services registered with this view model service manager.
        /// </summary>
		private readonly Dictionary<Type, object> _services = new Dictionary<Type, object>();

        /// <summary>
        /// Lock object for the services.
        /// </summary>
		private readonly object _servicesLock = new object();
		#endregion

		#region Constructor & destructor
        /// <summary>
        /// Initializes a new instance of the <see cref="ViewModelServiceManager"/> class.
        /// </summary>
        /// <remarks>
        /// For internal use only.
        /// </remarks>
        internal ViewModelServiceManager()
        {
        }
		#endregion

		#region Properties
		#endregion

		#region Methods
		/// <summary>
		/// Clears the services.
		/// </summary>
		public void Clear()
		{
			lock (_servicesLock)
			{
				_services.Clear();
			}
		}

		/// <summary>
		/// Adds a new service.
		/// </summary>
		/// <param name="serviceType">Type of the service.</param>
		/// <param name="serviceInstance">The service instance.</param>
		public void Add(Type serviceType, object serviceInstance)
		{
			if (serviceType == null)
			{
			    throw new ArgumentNullException("serviceType");
			}

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

			lock (_servicesLock)
			{
				_services[serviceType] = serviceInstance;
			}
		}

		/// <summary>
		/// Removes the specified service.
		/// </summary>
		/// <param name="serviceType">Type of the service.</param>
		public void Remove(Type serviceType)
		{
			if (serviceType == null)
			{
			    throw new ArgumentNullException("serviceType");
			}

			lock (_servicesLock)
			{
				_services.Remove(serviceType);
			}
		}
		#endregion

		#region IServiceProvider Members
		/// <summary>
		/// Gets the service object of the specified type.
		/// </summary>
		/// <param name="serviceType">An object that specifies the type of service object to get.</param>
		/// <returns>
		/// A service object of type <paramref name="serviceType"/>.
		/// -or-
		/// null if there is no service object of type <paramref name="serviceType"/>.
		/// </returns>
		public object GetService(Type serviceType)
		{
			if (serviceType == null)
			{
			    throw new ArgumentNullException("serviceType");
			}

            if (!serviceType.IsInterface)
            {
                throw new ArgumentException(Exceptions.ParameterMustBeAnInterface, "serviceType");
            }

			lock (_servicesLock)
			{
				return _services.ContainsKey(serviceType) ? _services[serviceType] : null;
			}
		}

		/// <summary>
		/// Gets the service object of the specified type.
		/// </summary>
		/// <typeparam name="T">Type of the service to retrieve.</typeparam>
		/// <returns>
		/// A service object of the specified parameter type.
		/// -or-
		/// null if there is no service object of the specified parameter type.
		/// </returns>
		public T GetService<T>()
		{
			return (T)GetService(typeof(T));
		}
		#endregion
	}
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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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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