added tests for the disposable action class

mRemoteNGTests/Tools/DisposableActionTests.cs

@@ -0,0 +1,42 @@
+using mRemoteNG.Tools;
+using NUnit.Framework;
+
+namespace mRemoteNGTests.Tools
+{
+	public class DisposableActionTests
+	{
+		[Test]
+		public void InitializerActionRunsWhenObjectIsCreated()
+		{
+			var initializerRan = false;
+			new DisposableAction(() => initializerRan = true, () => { });
+
+			Assert.That(initializerRan);
+		}
+
+		[Test]
+		public void DisposalActionRunsWhenDisposeIsCalled()
+		{
+			var disposeActionRan = false;
+			var action = new DisposableAction(() => {}, () => disposeActionRan = true);
+
+			Assert.That(disposeActionRan, Is.False);
+			action.Dispose();
+			Assert.That(disposeActionRan, Is.True);
+		}
+
+		[Test]
+		public void DisposeActionOnlyExecutedOnceWhenCallingDisposeMultipleTimes()
+		{
+			var invokeCount = 0;
+			var action = new DisposableAction(() => { }, () => invokeCount++);
+
+			action.Dispose();
+			action.Dispose();
+			action.Dispose();
+			action.Dispose();
+			action.Dispose();
+			Assert.That(invokeCount, Is.EqualTo(1));
+		}
+	}
+}

mRemoteNGTests/mRemoteNGTests.csproj

@@ -176,6 +176,7 @@
     <Compile Include="Security\XmlCryptoProviderBuilderTests.cs" />
     <Compile Include="TestHelpers\FileTestHelpers.cs" />
     <Compile Include="TestHelpers\SerializableConnectionInfoAllPropertiesOfType.cs" />
+    <Compile Include="Tools\DisposableActionTests.cs" />
     <Compile Include="Tools\ExternalToolsArgumentParserTests.cs" />
     <Compile Include="Tools\FullyObservableCollectionTests.cs" />
     <Compile Include="Tools\OptionalTests.cs" />

mRemoteV1/Tools/DisposableAction.cs

@@ -9,6 +9,7 @@ namespace mRemoteNG.Tools
 	/// </summary>
 	public class DisposableAction : IDisposable
 	{
+		private bool _isDisposed;
 		private readonly Action _disposeAction;
 
 		/// <summary>
@@ -29,6 +30,15 @@ namespace mRemoteNG.Tools
 
 		public void Dispose()
 		{
+			Dispose(true);
+		}
+
+		protected virtual void Dispose(bool disposing)
+		{
+			if (!disposing || _isDisposed)
+				return;
+
+			_isDisposed = true;
 			_disposeAction();
 		}
 	}