Added unit test for remote designer in Win32 mode.

Avalonia.sln

@@ -105,6 +105,10 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ControlCatalog.Desktop", "s
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ControlCatalog.iOS", "samples\ControlCatalog.iOS\ControlCatalog.iOS.csproj", "{57E0455D-D565-44BB-B069-EE1AA20F8337}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Avalonia.DesignerSupport.Tests", "tests\Avalonia.DesignerSupport.Tests\Avalonia.DesignerSupport.Tests.csproj", "{52F55355-D120-42AC-8116-8410A7D602FA}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Avalonia.DesignerSupport.TestApp", "tests\Avalonia.DesignerSupport.TestApp\Avalonia.DesignerSupport.TestApp.csproj", "{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}"
+EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "VirtualizationTest", "samples\VirtualizationTest\VirtualizationTest.csproj", "{FBCAF3D0-2808-4934-8E96-3F607594517B}"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Interop", "Interop", "{A0CC0258-D18C-4AB3-854F-7101680FC3F9}"
@@ -1633,6 +1637,82 @@ Global
 		{57E0455D-D565-44BB-B069-EE1AA20F8337}.Release|iPhoneSimulator.Build.0 = Release|iPhoneSimulator
 		{57E0455D-D565-44BB-B069-EE1AA20F8337}.Release|NetCoreOnly.ActiveCfg = Release|iPhoneSimulator
 		{57E0455D-D565-44BB-B069-EE1AA20F8337}.Release|x86.ActiveCfg = Release|iPhone
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Ad-Hoc|Any CPU.ActiveCfg = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Ad-Hoc|Any CPU.Build.0 = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Ad-Hoc|iPhone.ActiveCfg = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Ad-Hoc|iPhone.Build.0 = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Ad-Hoc|iPhoneSimulator.ActiveCfg = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Ad-Hoc|iPhoneSimulator.Build.0 = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Ad-Hoc|NetCoreOnly.ActiveCfg = Debug|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Ad-Hoc|x86.ActiveCfg = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Ad-Hoc|x86.Build.0 = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.AppStore|Any CPU.ActiveCfg = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.AppStore|Any CPU.Build.0 = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.AppStore|iPhone.ActiveCfg = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.AppStore|iPhone.Build.0 = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.AppStore|iPhoneSimulator.ActiveCfg = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.AppStore|iPhoneSimulator.Build.0 = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.AppStore|NetCoreOnly.ActiveCfg = Debug|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.AppStore|x86.ActiveCfg = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.AppStore|x86.Build.0 = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Debug|iPhone.ActiveCfg = Debug|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Debug|iPhone.Build.0 = Debug|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Debug|iPhoneSimulator.ActiveCfg = Debug|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Debug|iPhoneSimulator.Build.0 = Debug|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Debug|NetCoreOnly.ActiveCfg = Debug|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Debug|NetCoreOnly.Build.0 = Debug|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Debug|x86.Build.0 = Debug|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Release|Any CPU.Build.0 = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Release|iPhone.ActiveCfg = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Release|iPhone.Build.0 = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Release|iPhoneSimulator.ActiveCfg = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Release|iPhoneSimulator.Build.0 = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Release|NetCoreOnly.ActiveCfg = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Release|NetCoreOnly.Build.0 = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Release|x86.ActiveCfg = Release|Any CPU
+		{52F55355-D120-42AC-8116-8410A7D602FA}.Release|x86.Build.0 = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Ad-Hoc|Any CPU.ActiveCfg = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Ad-Hoc|Any CPU.Build.0 = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Ad-Hoc|iPhone.ActiveCfg = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Ad-Hoc|iPhone.Build.0 = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Ad-Hoc|iPhoneSimulator.ActiveCfg = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Ad-Hoc|iPhoneSimulator.Build.0 = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Ad-Hoc|NetCoreOnly.ActiveCfg = Debug|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Ad-Hoc|x86.ActiveCfg = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Ad-Hoc|x86.Build.0 = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.AppStore|Any CPU.ActiveCfg = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.AppStore|Any CPU.Build.0 = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.AppStore|iPhone.ActiveCfg = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.AppStore|iPhone.Build.0 = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.AppStore|iPhoneSimulator.ActiveCfg = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.AppStore|iPhoneSimulator.Build.0 = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.AppStore|NetCoreOnly.ActiveCfg = Debug|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.AppStore|x86.ActiveCfg = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.AppStore|x86.Build.0 = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Debug|iPhone.ActiveCfg = Debug|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Debug|iPhone.Build.0 = Debug|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Debug|iPhoneSimulator.ActiveCfg = Debug|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Debug|iPhoneSimulator.Build.0 = Debug|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Debug|NetCoreOnly.ActiveCfg = Debug|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Debug|NetCoreOnly.Build.0 = Debug|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Debug|x86.Build.0 = Debug|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Release|Any CPU.Build.0 = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Release|iPhone.ActiveCfg = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Release|iPhone.Build.0 = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Release|iPhoneSimulator.ActiveCfg = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Release|iPhoneSimulator.Build.0 = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Release|NetCoreOnly.ActiveCfg = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Release|NetCoreOnly.Build.0 = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Release|x86.ActiveCfg = Release|Any CPU
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08}.Release|x86.Build.0 = Release|Any CPU
 		{FBCAF3D0-2808-4934-8E96-3F607594517B}.Ad-Hoc|Any CPU.ActiveCfg = Release|Any CPU
 		{FBCAF3D0-2808-4934-8E96-3F607594517B}.Ad-Hoc|Any CPU.Build.0 = Release|Any CPU
 		{FBCAF3D0-2808-4934-8E96-3F607594517B}.Ad-Hoc|iPhone.ActiveCfg = Release|Any CPU
@@ -2258,6 +2338,7 @@ Global
 		{050CC912-FF49-4A8B-B534-9544017446DD}.Debug|iPhoneSimulator.ActiveCfg = Debug|Any CPU
 		{050CC912-FF49-4A8B-B534-9544017446DD}.Debug|iPhoneSimulator.Build.0 = Debug|Any CPU
 		{050CC912-FF49-4A8B-B534-9544017446DD}.Debug|NetCoreOnly.ActiveCfg = Debug|Any CPU
+		{050CC912-FF49-4A8B-B534-9544017446DD}.Debug|NetCoreOnly.Build.0 = Debug|Any CPU
 		{050CC912-FF49-4A8B-B534-9544017446DD}.Debug|x86.ActiveCfg = Debug|Any CPU
 		{050CC912-FF49-4A8B-B534-9544017446DD}.Debug|x86.Build.0 = Debug|Any CPU
 		{050CC912-FF49-4A8B-B534-9544017446DD}.Release|Any CPU.ActiveCfg = Release|Any CPU
@@ -2267,6 +2348,7 @@ Global
 		{050CC912-FF49-4A8B-B534-9544017446DD}.Release|iPhoneSimulator.ActiveCfg = Release|Any CPU
 		{050CC912-FF49-4A8B-B534-9544017446DD}.Release|iPhoneSimulator.Build.0 = Release|Any CPU
 		{050CC912-FF49-4A8B-B534-9544017446DD}.Release|NetCoreOnly.ActiveCfg = Release|Any CPU
+		{050CC912-FF49-4A8B-B534-9544017446DD}.Release|NetCoreOnly.Build.0 = Release|Any CPU
 		{050CC912-FF49-4A8B-B534-9544017446DD}.Release|x86.ActiveCfg = Release|Any CPU
 		{050CC912-FF49-4A8B-B534-9544017446DD}.Release|x86.Build.0 = Release|Any CPU
 		{F40FC0A2-1BC3-401C-BFC1-928EC4D4A9CE}.Ad-Hoc|Any CPU.ActiveCfg = Release|Any CPU
@@ -2418,6 +2500,8 @@ Global
 		{D0A739B9-3C68-4BA6-A328-41606954B6BD} = {9B9E3891-2366-4253-A952-D08BCEB71098}
 		{2B888490-D14A-4BCA-AB4B-48676FA93C9B} = {9B9E3891-2366-4253-A952-D08BCEB71098}
 		{57E0455D-D565-44BB-B069-EE1AA20F8337} = {9B9E3891-2366-4253-A952-D08BCEB71098}
+		{52F55355-D120-42AC-8116-8410A7D602FA} = {C5A00AC3-B34C-4564-9BDD-2DA473EF4D8B}
+		{F1381F98-4D24-409A-A6C5-1C5B1E08BB08} = {C5A00AC3-B34C-4564-9BDD-2DA473EF4D8B}
 		{FBCAF3D0-2808-4934-8E96-3F607594517B} = {9B9E3891-2366-4253-A952-D08BCEB71098}
 		{A0CC0258-D18C-4AB3-854F-7101680FC3F9} = {9B9E3891-2366-4253-A952-D08BCEB71098}
 		{C7A69145-60B6-4882-97D6-A3921DD43978} = {A0CC0258-D18C-4AB3-854F-7101680FC3F9}

build.cake

@@ -194,6 +194,7 @@ Task("Run-Unit-Tests")
         RunCoreTest("./tests/Avalonia.Markup.Xaml.UnitTests", parameters, false);
         RunCoreTest("./tests/Avalonia.Styling.UnitTests", parameters, false);
         RunCoreTest("./tests/Avalonia.Visuals.UnitTests", parameters, false);
+        RunCoreTest("./tests/Avalonia.DesignerSupport.UnitTests", parameters, false);
         if (parameters.IsRunningOnWindows)
         {
             RunCoreTest("./tests/Avalonia.Direct2D1.UnitTests", parameters, true);

build/XUnit.props

@@ -8,7 +8,7 @@
     <PackageReference Include="xunit.extensibility.execution" Version="2.3.0" />
     <PackageReference Include="xunit.runner.console" Version="2.3.0" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.3.0" />
-    <DotNetCliToolReference Include="dotnet-xunit" Version="2.3.0" />
+    <PackageReference Include="Xunit.SkippableFact" Version="1.3.6" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp2.0'">
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0" />

tests/Avalonia.DesignerSupport.TestApp/App.xaml

@@ -0,0 +1,6 @@
+<Application xmlns="https://github.com/avaloniaui">
+    <Application.Styles>
+        <StyleInclude Source="resm:Avalonia.Themes.Default.DefaultTheme.xaml?assembly=Avalonia.Themes.Default"/>
+        <StyleInclude Source="resm:Avalonia.Themes.Default.Accents.BaseLight.xaml?assembly=Avalonia.Themes.Default"/>
+    </Application.Styles>
+</Application>

tests/Avalonia.DesignerSupport.TestApp/App.xaml.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Avalonia.Markup.Xaml;
+
+namespace Avalonia.DesignerSupport.TestApp
+{
+    public class App : Application
+    {
+        public override void Initialize()
+        {
+            AvaloniaXamlLoader.Load(this);
+        }
+    }
+}

tests/Avalonia.DesignerSupport.TestApp/Avalonia.DesignerSupport.TestApp.csproj

@@ -0,0 +1,37 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.0</TargetFramework>    
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Update="**\*.xaml.cs">
+      <DependentUpon>%(Filename)</DependentUpon>
+    </Compile>
+    <EmbeddedResource Include="**\*.xaml">
+      <SubType>Designer</SubType>
+    </EmbeddedResource>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Avalonia.DesignerSupport\Avalonia.DesignerSupport.csproj" />
+    <ProjectReference Include="..\..\src\Avalonia.DotNetCoreRuntime\Avalonia.DotNetCoreRuntime.csproj" />
+    <ProjectReference Include="..\..\src\Markup\Avalonia.Markup.Xaml\Avalonia.Markup.Xaml.csproj" />
+    <ProjectReference Include="..\..\src\Markup\Avalonia.Markup\Avalonia.Markup.csproj" />
+    <ProjectReference Include="..\..\src\Avalonia.Animation\Avalonia.Animation.csproj" />
+    <ProjectReference Include="..\..\src\Avalonia.Base\Avalonia.Base.csproj" />
+    <ProjectReference Include="..\..\src\Avalonia.Controls\Avalonia.Controls.csproj" />
+    <ProjectReference Include="..\..\src\Avalonia.Diagnostics\Avalonia.Diagnostics.csproj" />
+    <ProjectReference Include="..\..\src\Avalonia.Input\Avalonia.Input.csproj" />
+    <ProjectReference Include="..\..\src\Avalonia.Interactivity\Avalonia.Interactivity.csproj" />
+    <ProjectReference Include="..\..\src\Avalonia.Layout\Avalonia.Layout.csproj" />
+    <ProjectReference Include="..\..\src\Avalonia.Visuals\Avalonia.Visuals.csproj" />
+    <ProjectReference Include="..\..\src\Avalonia.Styling\Avalonia.Styling.csproj" />
+    <ProjectReference Include="..\..\src\Avalonia.Themes.Default\Avalonia.Themes.Default.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Folder Include="Properties\" />
+  </ItemGroup>
+  
+  <Import Project="..\..\build\Serilog.props" />
+</Project>

tests/Avalonia.DesignerSupport.TestApp/MainWindow.xaml

@@ -0,0 +1,5 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:pages="clr-namespace:ControlCatalog.Pages;assembly=ControlCatalog"
+        Title="TESTAPP">
+    <Button/>
+</Window>

tests/Avalonia.DesignerSupport.TestApp/MainWindow.xaml.cs

@@ -0,0 +1,13 @@
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace Avalonia.DesignerSupport.TestApp
+{
+    public class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            AvaloniaXamlLoader.Load(this);
+        }
+    }
+}

tests/Avalonia.DesignerSupport.TestApp/Program.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Avalonia.Controls;
+
+namespace Avalonia.DesignerSupport.TestApp
+{
+    static class Program
+    {
+        /// <summary>
+        /// The main entry point for the application.
+        /// </summary>
+        static void Main()
+        {
+            BuildAvaloniaApp().Start<MainWindow>();
+        }
+
+        private static AppBuilder BuildAvaloniaApp()
+        {
+            return AppBuilder.Configure<App>().UsePlatformDetect();
+        }
+    }
+}

tests/Avalonia.DesignerSupport.Tests/Avalonia.DesignerSupport.Tests.csproj

@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk" ToolsVersion="15.0">
+  <PropertyGroup>
+    <TargetFrameworks>netcoreapp2.0</TargetFrameworks>
+    <OutputType>Library</OutputType>
+  </PropertyGroup>
+  <Import Project="..\..\build\UnitTests.NetCore.targets" />
+  <Import Project="..\..\build\Moq.props" />
+  <Import Project="..\..\build\XUnit.props" />
+  <Import Project="..\..\build\Rx.props" />
+  <Import Project="..\..\build\Microsoft.Reactive.Testing.props" />
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Avalonia.Controls\Avalonia.Controls.csproj" />
+    <ProjectReference Include="..\..\src\Avalonia.DesignerSupport\Avalonia.DesignerSupport.csproj" />
+  </ItemGroup>
+  <ItemGroup>
+    <Service Include="{82a7f48d-3b50-4b1e-b82e-3ada8210c358}" />
+  </ItemGroup>
+  <ItemGroup>
+    <Folder Include="Properties\" />
+  </ItemGroup>
+</Project>

tests/Avalonia.DesignerSupport.Tests/DesignerSupportTests.cs

@@ -0,0 +1,119 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Net;
+using System.Net.Sockets;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using Avalonia.Remote.Protocol;
+using Avalonia.Remote.Protocol.Designer;
+using Xunit;
+using Xunit.Extensions;
+
+namespace Avalonia.DesignerSupport.Tests
+{
+    public class DesignerSupportTests
+    {
+        private const string DesignerAppPath = "../../../../../src/tools/Avalonia.Designer.HostApp/bin/$BUILD/netcoreapp2.0/Avalonia.Designer.HostApp.dll";
+
+        [SkippableTheory,
+         InlineData(
+            @"..\..\..\..\..\tests/Avalonia.DesignerSupport.TestApp/bin/$BUILD/netcoreapp2.0/",
+            "Avalonia.DesignerSupport.TestApp",
+            "Avalonia.DesignerSupport.TestApp.dll",
+            @"..\..\..\..\..\tests\Avalonia.DesignerSupport.TestApp\MainWindow.xaml"),
+         InlineData(
+            @"..\..\..\..\..\samples\ControlCatalog.NetCore\bin\$BUILD\netcoreapp2.0\",
+            "ControlCatalog.NetCore",
+            "ControlCatalog.dll",
+            @"..\..\..\..\..\samples\ControlCatalog\MainWindow.xaml")]
+        public async Task Designer_In_Win32_Mode_Should_Provide_Valid_Hwnd(
+            string outputDir,
+            string executableName,
+            string assemblyName,
+            string xamlFile)
+        {
+            Skip.IfNot(RuntimeInformation.IsOSPlatform(OSPlatform.Windows));
+
+            var xaml = File.ReadAllText(xamlFile);
+            string buildType;
+#if DEBUG
+            buildType = "Debug";
+#else
+            buildType = "Release";
+#endif
+            outputDir = outputDir.Replace("$BUILD", buildType);
+
+            var sessionId = Guid.NewGuid();
+            long handle = 0;
+
+            var resultMessageReceivedToken = new CancellationTokenSource();
+
+            var tcpListener = new TcpListener(IPAddress.Loopback, 0);
+            tcpListener.Start();
+            var port = ((IPEndPoint)tcpListener.LocalEndpoint).Port;
+            tcpListener.Stop();
+            var transport = new BsonTcpTransport();
+            transport.Listen(IPAddress.Loopback, port, conn =>
+            {
+                conn.OnMessage += async (_, msg) =>
+                {
+                    if (msg is StartDesignerSessionMessage start)
+                    {
+                        Assert.Equal(sessionId, Guid.Parse(start.SessionId));
+                        await conn.Send(new UpdateXamlMessage
+                        {
+                            AssemblyPath = Path.Combine(outputDir, assemblyName),
+                            Xaml = xaml
+                        });
+                    }
+                    else if (msg is UpdateXamlResultMessage result)
+                    {
+                        handle = result.Handle != null ? long.Parse(result.Handle) : 0;
+                        resultMessageReceivedToken.Cancel();
+                        conn.Dispose();
+                    }
+                };
+            });
+
+            var cmdline =
+                $"exec --runtimeconfig \"{outputDir}{executableName}.runtimeconfig.json\" --depsfile \"{outputDir}{executableName}.deps.json\" "
+                + $" \"{DesignerAppPath.Replace("$BUILD", buildType)}\" "
+                + $"--transport tcp-bson://127.0.0.1:{port}/ --session-id {sessionId} --method win32 \"{outputDir}{executableName}.dll\"";
+
+            using (var proc = new Process
+            {
+                StartInfo = new ProcessStartInfo("dotnet", cmdline)
+                {
+                    UseShellExecute = false,
+                    RedirectStandardOutput = true,
+                    RedirectStandardError = true,
+                    CreateNoWindow = true,
+                },
+                EnableRaisingEvents = true
+            })
+            {
+                proc.Start();
+
+                var cancelled = false;
+                try
+                {
+                    await Task.Delay(10000, resultMessageReceivedToken.Token);
+                }
+                catch (TaskCanceledException)
+                {
+                    cancelled = true;
+                }
+
+                Assert.True(cancelled);
+                Assert.NotEqual(0, handle);
+                proc.Kill();
+                proc.WaitForExit();
+            }
+        }
+    }
+}