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Catel - Part 4 of n: Unit testing with Catel

, 28 Jan 2011
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
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MVVM
Commands
Interfaces
Exceptions
Services
EventArgs
Exceptions
Interfaces
ViewModels
Attributes
Interfaces
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Reflection
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Runtime
Serialization
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Catel.Examples.Models
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Catel.Examples.PersonApplication
Properties
Settings.settings
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edit.png
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UI
Data
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ViewModels
Windows
Catel.Examples.Silverlight
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edit.png
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UI
Data
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Pages
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Windows
Catel.Examples.Silverlight.Web
Catel.Examples.Silverlight.Web.csproj.user
ClientBin
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Catel.FxCop
Catel.Silverlight
Diagnostics
log4net
Core
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Services
ViewModels
Properties
Catel.Core
Catel.Windows
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Generic
Assets
Old
Windows
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Data
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Helpers
Helpers
Catel.Silverlight.Test
Properties
Catel.Silverlight.Test.Web
Catel.Silverlight.Test.Web.csproj.user
ClientBin
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Catel.snk
Catel.Templates.WpfApplication
Properties
Settings.settings
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Controls
ViewModels
Windows
Catel.Templates.WpfItemTemplates
Properties
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Controls
ViewModels
Windows
Catel.Test
Collections
Convert
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IO
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UI
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Properties
Reflection
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Security
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Test References
Catel.Windows.accessor
Windows
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Catel.vsmdi
Catel.Windows
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ViewModelBase.cd
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MVVM
Commands
Services
Test
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Add.png
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GrayscaleEffect.fx
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DataWindow
TipOfTheDay
Local.testsettings
Settings.StyleCop
TraceAndTestImpact.testsettings
// --------------------------------------------------------------------------------------------------------------------
// <copyright file="ViewModelBase.cs" company="Catel development team">
//   Copyright (c) 2008 - 2011 Catel development team. All rights reserved.
// </copyright>
// <summary>
//   View model base for MVVM implementations. This class is based on the <see cref="DataObjectBase" />, and supports all
//   common interfaces used by WPF.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using Catel.MVVM.Services;
using Catel.Windows.Properties;
using log4net;
using log4net.Core;
using Microsoft.Practices.Unity;

#if !SILVERLIGHT
using Microsoft.Practices.Unity.Configuration;
#endif

namespace Catel.MVVM
{
    /// <summary>
    /// View model base for MVVM implementations. This class is based on the <see cref="DataObjectBase"/>, and supports all
    /// common interfaces.
    /// </summary>
    /// <remarks>
#if SILVERLIGHT
    /// This class registers the Silverlight-specific view model services.
#else
    /// This class registers the WPF-specific view model services.
#endif
    /// </remarks>
    public abstract class ViewModelBase : ViewModelBaseWithoutServices
    {
        #region Constructor & destructor
        /// <summary>
        /// Initializes a new instance of the <see cref="ViewModelBase"/> class with support for <see cref="IEditableObject"/>.
        /// </summary>
        protected ViewModelBase() { }

        /// <summary>
        /// Initializes a new instance of the <see cref="ViewModelBase"/> class.
        /// </summary>
        /// <param name="supportIEditableObject">if set to <c>true</c>, the view model will natively support models that
        /// implement the <see cref="IEditableObject"/> interface.</param>
        protected ViewModelBase(bool supportIEditableObject)
            : base(supportIEditableObject) { }

        /// <summary>
        /// Initializes a new instance of the <see cref="ViewModelBase"/> class.
        /// </summary>
        /// <param name="supportIEditableObject">if set to <c>true</c>, the view model will natively support models that
        /// implement the <see cref="IEditableObject"/> interface.</param>
        /// <param name="ignoreMultipleModelsWarning">if set to <c>true</c>, the warning when using multiple models is ignored.</param>
        /// <exception cref="ModelNotRegisteredException">when a mapped model is not registered.</exception>
        /// <exception cref="PropertyNotFoundInModelException">when a mapped model property is not found.</exception>
        protected ViewModelBase(bool supportIEditableObject, bool ignoreMultipleModelsWarning)
            : base(supportIEditableObject, ignoreMultipleModelsWarning) { }

        /// <summary>
        /// Initializes a new instance of the <see cref="ViewModelBase"/> class.
        /// <para/>
        /// This constructor allows services to be injected. When <param name="services"/> contains any elements, the
        /// <see cref="RegisterViewModelServices"/> method is not invoked.
        /// </summary>
        /// <param name="services">Dictionary of services to register.</param>
        /// <exception cref="ModelNotRegisteredException">when a mapped model is not registered.</exception>
        /// <exception cref="PropertyNotFoundInModelException">when a mapped model property is not found.</exception>
        protected ViewModelBase(Dictionary<Type, object> services)
            : base(services) { }

        /// <summary>
        /// Initializes a new instance of the <see cref="ViewModelBase"/> class.
        /// <para/>
        /// This constructor allows services to be injected. When <param name="services"/> contains any elements, the
        /// <see cref="RegisterViewModelServices"/> method is not invoked.
        /// </summary>
        /// <param name="services">Dictionary of services to register.</param>
        /// <param name="supportIEditableObject">if set to <c>true</c>, the view model will natively support models that
        /// implement the <see cref="IEditableObject"/> interface.</param>
        /// <exception cref="ModelNotRegisteredException">when a mapped model is not registered.</exception>
        /// <exception cref="PropertyNotFoundInModelException">when a mapped model property is not found.</exception>
        protected ViewModelBase(Dictionary<Type, object> services, bool supportIEditableObject)
            : base(services, supportIEditableObject) { }

        /// <summary>
        /// Initializes a new instance of the <see cref="ViewModelBase"/> class.
        /// <para />
        /// This constructor allows services to be injected. When <param name="services"/> contains any elements, the
        /// <see cref="RegisterViewModelServices"/> method is not invoked.
        /// </summary>
        /// <param name="services">Dictionary of services to register.</param>
        /// <param name="supportIEditableObject">if set to <c>true</c>, the view model will natively support models that
        /// implement the <see cref="IEditableObject"/> interface.</param>
        /// <param name="ignoreMultipleModelsWarning">if set to <c>true</c>, the warning when using multiple models is ignored.</param>
        /// <exception cref="ModelNotRegisteredException">when a mapped model is not registered.</exception>
        /// <exception cref="PropertyNotFoundInModelException">when a mapped model property is not found.</exception>
        protected ViewModelBase(Dictionary<Type, object> services, bool supportIEditableObject, bool ignoreMultipleModelsWarning)
            : base(services, supportIEditableObject, ignoreMultipleModelsWarning) { }
        #endregion

        #region Methods
        /// <summary>
        /// Registers the known view model services.
        /// </summary>
        /// <param name="container">The IoC container.</param>
        protected override void RegisterViewModelServices(IUnityContainer container)
        {
            // Logger already created, not IoC required
            ViewModelServiceManager.Add(typeof(ILogger), Log);

            try
            {
                Log.Debug(TraceMessages.RegisteringDefaultServiceImplementationsForIoCContainer);

                container.RegisterType<IOpenFileService, OpenFileService>()
                    .RegisterType<ISaveFileService, SaveFileService>()
                    .RegisterType<IMessageService, MessageService>()
#if !SILVERLIGHT
                    .RegisterType<IPleaseWaitService, PleaseWaitService>()
#endif
                    .RegisterType<IUIVisualizerService, UIVisualizerService>();

                Log.Debug(TraceMessages.RegisteredDefaultServiceImplementationsForIoCContainer);

#if !SILVERLIGHT
                // Load from config, overrides defaults
                UnityConfigurationSection section = (UnityConfigurationSection)ConfigurationManager.GetSection("unity");
                if ((section != null) && (section.Containers.Count > 0))
                {
                    Log.Debug(TraceMessages.ConfiguringIoCContainerViaConfigurationFile);

                    section.Configure(container);

                    Log.Debug(TraceMessages.ConfiguredIoCContainerViaConfigurationFile);
                }
#endif
            }
            catch (Exception ex)
            {
                Log.Error(ex, TraceMessages.FailedToConfigureIoCContainer);

                throw new Exception(Exceptions.FailedToConfigureIoCContainer, ex);
            }

            ViewModelServiceManager.Add(typeof(IOpenFileService), container.Resolve<IOpenFileService>());
            ViewModelServiceManager.Add(typeof(ISaveFileService), container.Resolve<ISaveFileService>());
            ViewModelServiceManager.Add(typeof(IMessageService), container.Resolve<IMessageService>());
            ViewModelServiceManager.Add(typeof(IPleaseWaitService), container.Resolve<IPleaseWaitService>());
            ViewModelServiceManager.Add(typeof(IUIVisualizerService), container.Resolve<IUIVisualizerService>());
        }
        #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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Article Copyright 2011 by Geert van Horrik
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