Fix errors when installing jQuery NuGet package.

src/AddIns/Misc/PackageManagement/Project/PackageManagement.csproj

@@ -61,6 +61,7 @@
     <Folder Include="Src" />
     <Folder Include="Src\Design" />
     <Folder Include="Src\EnvDTE" />
+    <Folder Include="Src\VisualStudio" />
     <Folder Include="Src\Scripting" />
   </ItemGroup>
   <ItemGroup>
@@ -304,6 +305,9 @@
     <Compile Include="Src\UpdatePackageAction.cs" />
     <Compile Include="Src\ViewModelBase.cs" />
     <Compile Include="Src\PackageManagementViewModels.cs" />
+    <Compile Include="Src\VisualStudio\NotInstalledException.cs" />
+    <Compile Include="Src\VisualStudio\Package.cs" />
+    <Compile Include="Src\VisualStudio\SVsExtensionManager.cs" />
   </ItemGroup>
   <ItemGroup>
     <Page Include="Src\AddPackageReferenceView.xaml" />

src/AddIns/Misc/PackageManagement/Project/Src/VisualStudio/NotInstalledException.cs

@@ -0,0 +1,11 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+
+namespace Microsoft.VisualStudio.ExtensionManager
+{
+	public class NotInstalledException : Exception
+	{
+	}
+}

src/AddIns/Misc/PackageManagement/Project/Src/VisualStudio/Package.cs

@@ -0,0 +1,16 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using Microsoft.VisualStudio.ExtensionManager;
+
+namespace Microsoft.VisualStudio.Shell
+{
+	public abstract class Package
+	{
+		public static object GetGlobalService(Type serviceType)
+		{
+			return new SVsExtensionManager();
+		}
+	}
+}

src/AddIns/Misc/PackageManagement/Project/Src/VisualStudio/SVsExtensionManager.cs

@@ -0,0 +1,15 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+
+namespace Microsoft.VisualStudio.ExtensionManager
+{
+	public class SVsExtensionManager
+	{
+		public object GetInstalledExtension(string identifier)
+		{
+			throw new NotInstalledException();
+		}
+	}
+}

src/AddIns/Misc/PackageManagement/Test/PackageManagement.Tests.csproj

@@ -230,6 +230,8 @@
     <Compile Include="Src\UpdatedPackageViewModelTests.cs" />
     <Compile Include="Src\UpdatePackageActionTests.cs" />
     <Compile Include="Src\ViewModelBaseTests.cs" />
+    <Compile Include="Src\VisualStudio\PackageTests.cs" />
+    <Compile Include="Src\VisualStudio\SVsExtensionManagerTests.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\..\..\Libraries\AvalonEdit\ICSharpCode.AvalonEdit\ICSharpCode.AvalonEdit.csproj">
@@ -270,6 +272,7 @@
     <Folder Include="Src\Helpers\Tests" />
     <Folder Include="Src" />
     <Folder Include="Src\EnvDTE" />
+    <Folder Include="Src\VisualStudio" />
     <Folder Include="Src\Scripting" />
   </ItemGroup>
   <ItemGroup>

src/AddIns/Misc/PackageManagement/Test/Src/VisualStudio/PackageTests.cs

@@ -0,0 +1,22 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using Microsoft.VisualStudio.ExtensionManager;
+using Microsoft.VisualStudio.Shell;
+using NUnit.Framework;
+
+namespace PackageManagement.Tests.VisualStudio
+{
+	[TestFixture]
+	public class PackageTests
+	{
+		[Test]
+		public void GetGlobalService_GetExtensionManagerService_ReturnsExtensionManager()
+		{
+			object extensionManager = Package.GetGlobalService(typeof(SVsExtensionManager)) as SVsExtensionManager;
+			
+			Assert.IsInstanceOf(typeof(SVsExtensionManager), extensionManager);
+		}
+	}
+}

src/AddIns/Misc/PackageManagement/Test/Src/VisualStudio/SVsExtensionManagerTests.cs

@@ -0,0 +1,28 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using Microsoft.VisualStudio.ExtensionManager;
+using NUnit.Framework;
+
+namespace PackageManagement.Tests.VisualStudio
+{
+	[TestFixture]
+	public class SVsExtensionManagerTests
+	{
+		SVsExtensionManager extensionManager;
+		
+		void CreateExtensionManager()
+		{
+			extensionManager = new SVsExtensionManager();
+		}
+		
+		[Test]
+		public void GetInstalledExtension_UnknownExtensionIdPassed_ThrowsNotInstalledException()
+		{
+			CreateExtensionManager();
+			
+			Assert.Throws<NotInstalledException>(() => extensionManager.GetInstalledExtension("UnknownExtensionId"));
+		}
+	}
+}