Adding ViewModelBase and tests.

BrentEdwards.MVVM.Test/BrentEdwards.MVVM.Test.csproj

@@ -60,6 +60,7 @@
     <Compile Include="Navigation\ViewResultTests.cs" />
     <Compile Include="Navigation\ViewTargetsTests.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="ViewModelBaseTests.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\BrentEdwards.MVVM\BrentEdwards.MVVM.csproj">

BrentEdwards.MVVM.Test/ViewModelBaseTests.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Text;
+using System.Collections.Generic;
+using System.Linq;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.ComponentModel;
+
+namespace BrentEdwards.MVVM.Test
+{
+	[TestClass]
+	public sealed class ViewModelBaseTests
+	{
+		private class MockViewModel : ViewModelBase
+		{
+			public void TriggerPropertyChanged(string propertyName)
+			{
+				NotifyPropertyChanged(propertyName);
+			}
+		}
+
+		private List<string> _propertiesChanged;
+		private void PropertyChanged(object sender, PropertyChangedEventArgs e)
+		{
+			_propertiesChanged.Add(e.PropertyName);
+		}
+
+		[TestMethod]
+		public void NotifyPropertyChanged()
+		{
+			_propertiesChanged = new List<string>();
+
+			var viewModel = new MockViewModel();
+			var propertyName = Guid.NewGuid().ToString();
+
+			viewModel.PropertyChanged += PropertyChanged;
+			viewModel.TriggerPropertyChanged(propertyName);
+			viewModel.PropertyChanged -= PropertyChanged;
+
+			Assert.AreEqual(1, _propertiesChanged.Count);
+			Assert.IsTrue(_propertiesChanged.Contains(propertyName));
+		}
+	}
+}

BrentEdwards.MVVM/BrentEdwards.MVVM.csproj

@@ -58,6 +58,7 @@
     <Compile Include="Navigation\ViewResult.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Navigation\ViewTargets.cs" />
+    <Compile Include="ViewModelBase.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 

BrentEdwards.MVVM/ViewModelBase.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.ComponentModel;
+
+namespace BrentEdwards.MVVM
+{
+	public abstract class ViewModelBase : INotifyPropertyChanged
+	{
+		public event PropertyChangedEventHandler PropertyChanged;
+
+		protected void NotifyPropertyChanged(String propertyName)
+		{
+			if (PropertyChanged != null)
+			{
+				var args = new PropertyChangedEventArgs(propertyName);
+				PropertyChanged(this, args);
+			}
+		}
+	}
+}