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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
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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
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Save.png
TipOfTheDay.png
Warning.png
Themes
Aero
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Assets
background.png
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EmptyEffect.ps
EmptyEffect.fx
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GrayscaleEffect.fx
GrayscaleEffect.ps
Extensions
Imaging
Extensions
Windows
DataWindow
TipOfTheDay
Local.testsettings
Settings.StyleCop
TraceAndTestImpact.testsettings
using System;
using System.Collections.Generic;
using System.Windows.Markup;
using Catel.Windows.Properties;
using log4net;

namespace Catel.Windows.Markup
{
    /// <summary>
    /// Custom <see cref="IXamlTypeResolver"/> because Microsoft "wisely" decided to make it internal.
    /// </summary>
    /// <remarks>
    /// This class was intended to be used by the <see cref="StyleHelper"/> class, but the issue was solved by
    /// using the <see cref="XamlTypeMapper"/> class. Therefore, this class is just party finished (but not yet thrown away).
    /// </remarks>
    internal class XamlTypeResolver : IXamlTypeResolver
    {
        #region Variables
        /// <summary>
        /// The <see cref="ILog">log</see> object.
        /// </summary>
        private static readonly ILog Log = LogManager.GetLogger(System.Reflection.MethodInfo.GetCurrentMethod().DeclaringType);

        private readonly Dictionary<string, Type> _cache = new Dictionary<string, Type>();
        #endregion

        #region Methods
        /// <summary>
        /// When implemented in a derived class, resolves a XAML element to the corresponding type.
        /// </summary>
        /// <param name="qualifiedTypeName">The fully qualified type name to resolve.</param>
        /// <returns>
        /// The type that <paramref name="qualifiedTypeName"/> represents.
        /// </returns>
        public Type Resolve(string qualifiedTypeName)
        {
            // Clean up type name
            string typeName = CleanUpTypeName(qualifiedTypeName);

            // Resolve type
            ResolveType(typeName);

            // Check if the object isn't already in the cache
            if (!_cache.ContainsKey(typeName))
            {
                // Log
                Log.Warn(TraceMessages.CouldNotResolveType, qualifiedTypeName);

                // Failed);
                return null;
            }

            // Log
            Log.Debug(TraceMessages.SuccessfullyResolvedType, qualifiedTypeName, _cache[typeName]);

            // Return
            return _cache[typeName];
        }

        /// <summary>
        /// Resolves the type.
        /// </summary>
        /// <param name="typeName">Name of the type.</param>
        private void ResolveType(string typeName)
        {
            // Check if the object isn't already in the cache
            if (_cache.ContainsKey(typeName)) return;

            // Try to get the .NET framework type
            Type dotNetType = ResolveDotNetFrameworkType(typeName);
            if (dotNetType != null)
            {
                // Add to cache
                _cache.Add(typeName, dotNetType);

                // Exit
                return;
            }

            // Resolve manually
            // TODO:
        }

        /// <summary>
        /// Resolves the type of the .NET Framework (thus a control located in the .NET Framework that can be used without
        /// namespace prefix in XAML).
        /// </summary>
        /// <param name="typeName">Name of the type.</param>
        /// <returns>
        /// 	<see cref="Type"/> or <c>null</c> if the name is not a .NET Framework type.
        /// </returns>
        private static Type ResolveDotNetFrameworkType(string typeName)
        {
            // Create list of possible prefixes
            List<string> prefixes = new List<string>();
            prefixes.Add("System.Windows.Controls");
            prefixes.Add("System.Windows");

            // Loop all prefixes and try to load the type
            foreach (string prefix in prefixes)
            {
                string fullTypeName = string.Format("{0}{1}", prefix, typeName);
                Type type = Type.GetType(fullTypeName);
                if (type != null)
                {
                    return type;
                }
            }

            // Not found
            return null;
        }

        /// <summary>
        /// Cleans up the name of the type by stripping "{x:Type" and "}" from the type name.
        /// </summary>
        /// <param name="typeName">Name of the type.</param>
        /// <returns></returns>
        private static string CleanUpTypeName(string typeName)
        {
            // TODO: Implement
            return typeName;
        }
        #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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