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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
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
ExpressionDark
Assets
Generic
Assets
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Jetpack
Assets
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Old
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Windows
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Media
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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="TraceAppenderEx.cs" company="Catel development team">
//   Copyright (c) 2008 - 2011 Catel development team. All rights reserved.
// </copyright>
// <summary>
//   
// </summary>
// --------------------------------------------------------------------------------------------------------------------

#region Apache License
// Licensed to the Apache Software Foundation (ASF) under one or more 
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership. 
// The ASF licenses this file to you under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with 
// the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#endregion

#define TRACE

using System.Diagnostics;
using log4net.Core;
using log4net.Layout;

namespace log4net.Appender
{
	/// <summary>
	/// Appends log events to the <see cref="System.Diagnostics.Trace"/> system.
	/// </summary>
	/// <remarks>
	/// <para>
	/// The application configuration file can be used to control what listeners 
	/// are actually used. See the MSDN documentation for the 
	/// <see cref="System.Diagnostics.Trace"/> class for details on configuring the
	/// trace system.
	/// </para>
	/// <para>
	/// Events are written using the <c>System.Diagnostics.Trace.Write(string,string)</c>
	/// method. The event's logger name is the default value for the category parameter 
    /// of the Write method. 
	/// </para>
	/// <para>
	/// <b>Compact Framework</b><br />
	/// The Compact Framework does not support the <see cref="System.Diagnostics.Trace"/>
	/// class for any operation except <c>Assert</c>. When using the Compact Framework this
	/// appender will write to the <see cref="System.Diagnostics.Debug"/> system rather than
	/// the Trace system. This appender will therefore behave like the <see cref="DebugAppender"/>.
	/// </para>
	/// </remarks>
	/// <author>Douglas de la Torre</author>
	/// <author>Nicko Cadell</author>
	/// <author>Gert Driesen</author>
	/// <author>Ron Grabowski</author>
	/// <author>Geert van Horrik (created the extended version)</author>
	public class TraceAppenderEx : AppenderSkeleton
	{
		#region Public Instance Constructors

        /// <summary>
        /// Initializes a new instance of the <see cref="TraceAppenderEx"/> class.
        /// </summary>
        /// <remarks>Empty default constructor</remarks>
		public TraceAppenderEx()
		{
		}

		/// <summary>
		/// Initializes a new instance of the <see cref="TraceAppenderEx" /> class
		/// with a specified layout.
		/// </summary>
		/// <param name="layout">The layout to use with this appender.</param>
		/// <remarks>
		/// <para>
		/// Obsolete constructor.
		/// </para>
		/// </remarks>
		[System.Obsolete("Instead use the default constructor and set the Layout property")]
		public TraceAppenderEx(ILayout layout)
		{
			Layout = layout;
		}

		#endregion Public Instance Constructors

		#region Public Instance Properties

		/// <summary>
		/// Gets or sets a value indicating whether the appender will 
		/// flush at the end of each write.
		/// </summary>
		/// <remarks>
		/// <para>The default behavior is to flush at the end of each 
		/// write. If the option is set to<c>false</c>, then the underlying 
		/// stream can defer writing to physical medium to a later time. 
		/// </para>
		/// <para>
		/// Avoiding the flush operation at the end of each append results 
		/// in a performance gain of 10 to 20 percent. However, there is safety
		/// trade-off involved in skipping flushing. Indeed, when flushing is
		/// skipped, then it is likely that the last few log events will not
		/// be recorded on disk when the application exits. This is a high
		/// price to pay even for a 20% performance gain.
		/// </para>
		/// </remarks>
		public bool ImmediateFlush
		{
			get { return _immediateFlush; }
			set { _immediateFlush = value; }
		}

        /// <summary>
        /// Gets or sets the category parameter sent to the Trace method.
        /// </summary>
        /// <remarks>
        /// <para>
        /// Defaults to %logger which will use the logger name of the current 
        /// <see cref="LoggingEvent"/> as the category parameter.
        /// </para>
        /// <para>
        /// </para> 
        /// </remarks>
	    public PatternLayout Category
	    {
	        get { return _category; }
	        set { _category = value; }
	    }

	    #endregion Public Instance Properties

		#region Override implementation of AppenderSkeleton

		/// <summary>
		/// Writes the logging event to the <see cref="System.Diagnostics.Trace"/> system.
		/// </summary>
		/// <param name="loggingEvent">The event to log.</param>
		/// <remarks>
		/// <para>
		/// Writes the logging event to the <see cref="System.Diagnostics.Trace"/> system.
		/// </para>
		/// </remarks>
        protected override void Append(LoggingEvent loggingEvent) 
		{
#if NETC
			System.Diagnostics.Debug.WriteLine(RenderLoggingEvent(loggingEvent), m_category.Format(loggingEvent));
#else
			string message = RenderLoggingEvent(loggingEvent);

			if (loggingEvent.Level == Level.Info)
			{
				Trace.TraceInformation(message);
			}
			else if (loggingEvent.Level == Level.Warn)
			{
				Trace.TraceWarning(message);
			}
			else if (loggingEvent.Level == Level.Error || loggingEvent.Level == Level.Severe || loggingEvent.Level == Level.Alert || 
				loggingEvent.Level == Level.Fatal || loggingEvent.Level == Level.Emergency)
			{
				Trace.TraceError(message);
			}
			else
			{
				// Treat as verbose
				Trace.WriteLine(message);
			}
#endif
	 
			if (_immediateFlush) 
			{
#if NETCF
				System.Diagnostics.Debug.Flush();
#else
				Trace.Flush();
#endif
			} 
		}

		/// <summary>
		/// This appender requires a <see cref="Layout"/> to be set.
		/// </summary>
		/// <value><c>true</c> if the appender requires layout to be set; otherwise <c>false</c>.</value>
		/// <remarks>
		/// <para>
		/// This appender requires a <see cref="Layout"/> to be set.
		/// </para>
		/// </remarks>
        protected override bool RequiresLayout
		{
			get { return true; }
		}

		#endregion Override implementation of AppenderSkeleton

		#region Private Instance Fields

		/// <summary>
		/// Immediate flush means that the underlying writer or output stream
		/// will be flushed at the end of each append operation.
		/// </summary>
		/// <remarks>
		/// <para>
		/// Immediate flush is slower but ensures that each append request is 
		/// actually written. If <see cref="ImmediateFlush"/> is set to
		/// <c>false</c>, then there is a good chance that the last few
		/// logs events are not actually written to persistent media if and
		/// when the application crashes.
		/// </para>
		/// <para>
		/// The default value is <c>true</c>.</para>
		/// </remarks>
		private bool _immediateFlush = true;

        /// <summary>
        /// Defaults to %logger
        /// </summary>
        private PatternLayout _category = new PatternLayout("%logger");

		#endregion Private Instance Fields
	}
}

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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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