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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
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ViewModels
Catel.Articles.Base
Data
Attributes
Properties
Settings.settings
Resources
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CatenaLogic.png
Preview.png
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UI
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Helpers
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Windows
Catel.Core
Attributes
ClassDiagrams
DataObjectBase.cd
SavableDataObjectBase.cd
Collections
Helpers
ComponentModel
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Attributes
Exceptions
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Diagnostics
Extensions
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Exceptions
Helpers
IO
Exceptions
IoC
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Interfaces
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EventArgs
Exceptions
Interfaces
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Reflection
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Catel.Examples.Models
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Catel.Examples.PersonApplication
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Catel.Examples.Silverlight
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Catel.Examples.Silverlight.Web
Catel.Examples.Silverlight.Web.csproj.user
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Catel.FxCop
Catel.Silverlight
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log4net
Core
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Catel.Core
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Old
Windows
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Helpers
Catel.Silverlight.Test
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Catel.Silverlight.Test.Web
Catel.Silverlight.Test.Web.csproj.user
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Catel.snk
Catel.Templates.WpfApplication
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Catel.Templates.WpfItemTemplates
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ViewModels
Windows
Catel.Test
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Convert
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UI
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Catel.Windows.accessor
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Catel.vsmdi
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Local.testsettings
Settings.StyleCop
TraceAndTestImpact.testsettings
// --------------------------------------------------------------------------------------------------------------------
// <copyright file="BooleanToTextConverter.cs" company="Catel development team">
//   Copyright (c) 2008 - 2011 Catel development team. All rights reserved.
// </copyright>
// <summary>
//   Available modes for the <see cref="BooleanToTextConverter" />.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

using System;
using System.Windows;
using System.Windows.Data;
using Catel.Windows.Properties;
using log4net;

namespace Catel.Windows.Data.Converters
{
    #region Enums
    /// <summary>
    /// Available modes for the <see cref="BooleanToTextConverter"/>.
    /// </summary>
    enum BooleanToTextConverterMode
    {
        /// <summary>
        /// True becomes <c>Yes</c>, false becomes <c>No</c>.
        /// </summary>
        YesNo,

        /// <summary>
        /// True becomes <c>x</c>, false becomes <c></c> (thus empty).
        /// </summary>
        X
    }
    #endregion

	/// <summary>
	/// BooleanToTextConverter.
	/// </summary>
#if !SILVERLIGHT
	[ValueConversion(typeof(bool), typeof(string))]
#endif
    public class BooleanToTextConverter : IValueConverter
	{
		#region Properties
        /// <summary>
        /// The <see cref="ILog">log</see> object.
        /// </summary>
		private static readonly ILog Log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
		#endregion

		#region Methods
		/// <summary>
        /// Converts a boolean value to text.
        /// </summary>
        /// <param name="value">Value to convert.</param>
        /// <param name="targetType">Not used.</param>
        /// <param name="parameter"><see cref="BooleanToTextConverterMode"/>.</param>
        /// <param name="culture">Not used.</param>
        /// <returns>Text presentation of the boolean value.</returns>
        /// <remarks>
        /// If the parameter is invalid, or the method fails to parse the parameter, <see cref="BooleanToTextConverterMode.YesNo"/>
        /// will be used to convert the value.
        /// </remarks>
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            // Validate input
            if ((value == null) || !(value is bool))
            {
                return string.Empty;
            }

            // Parse the value
            bool typedValue = (bool)value;

            // Parse the mode
            BooleanToTextConverterMode mode = (parameter is BooleanToTextConverterMode) ? (BooleanToTextConverterMode)parameter : ParseMode(parameter as string);

            // Now convert the value
            switch (mode)
            {
                case BooleanToTextConverterMode.X:
                    return (typedValue) ? "x" : string.Empty;

                case BooleanToTextConverterMode.YesNo:
                    return (typedValue) ? Resources.Yes : Resources.No;

                default:
                    // Some strange way, this method fails (all known modes must be handled), so return "failed"
					return Resources.Failed;
            }
        }

        /// <summary>
        /// Not supported.
        /// </summary>
        /// <param name="value"></param>
        /// <param name="targetType"></param>
        /// <param name="parameter"></param>
        /// <param name="culture"></param>
        /// <returns></returns>
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            return ConverterHelper.DoNothingBindingValue;
        }

        /// <summary>
        /// Parses the parameter and returns a <see cref="BooleanToTextConverterMode"/> that represents the parameter. 
        /// </summary>
        /// <param name="parameter"><see cref="BooleanToTextConverterMode"/> as text.</param>
        /// <returns><see cref="BooleanToTextConverterMode"/> as it was passed as a string.</returns>
        /// <remarks>
        /// If the parameter is invalid, or the method fails to parse the parameter, <see cref="BooleanToTextConverterMode.YesNo"/>
        /// will be returned as a default value.
        /// </remarks>
        private static BooleanToTextConverterMode ParseMode(string parameter)
        {
            // Declare variables
            BooleanToTextConverterMode mode = BooleanToTextConverterMode.YesNo;

            // Check input
            if (string.IsNullOrEmpty(parameter))
            {
                // Log
				Log.Error(TraceMessages.ConverterParameterIsNullSoDefaultIsUsed, mode.ToString());

                // Return mode
                return mode;
            }

            try
            {
                // Parse
                mode = (BooleanToTextConverterMode)Enum.Parse(typeof(BooleanToTextConverterMode), parameter, false);
            }
            catch (ArgumentException)
            {
                // Log
				Log.Error(TraceMessages.ParseFailed, parameter, "BooleanToTextConverterMode");

                // Return mode
                return mode;
            }

            // Return
            return mode;
        }
        #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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