Add desktop tests project

The primary purpose of this is to split out the handling of the native
libs. This is a consequence of using ProjectReference, and resolves the
following issues:

1. When compiling for iOS, it really doesn't like multiple files being
   included in the same output path. Example: all Windows SDL.dll files
   placed as SDL.dll in the output path.
2. Even if (1) was somehow resolved, the iOS build also doesn't like the
   linux-specific .so files being included.
3. As a consequence of (1), it's likely that the project already doesn't
   work on some configurations. For example, because win-x86 is
   specified as the last item, it will likely take precedence over all
   other versions.
4. It looks like `RuntimeIdentifier` is not project-transitive, against
   my expectations. I really want the project to both select the correct
   single native lib for the current platform, and also support
   compiling with a RID (`dotnet build -r ...`).

So now we only copy the correct lib to the output path, and don't do it
while packaging (not required).

SDL3-CS.Tests.Desktop/Program.cs

@@ -0,0 +1,7 @@
+internal class Program
+{
+    public static void Main(string[] args)
+    {
+        SDL.Tests.Program.Main();
+    }
+}

SDL3-CS.Tests.Desktop/SDL3-CS.Tests.Desktop.csproj

@@ -0,0 +1,35 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>SDL3.Tests.Desktop</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\SDL3-CS.Tests\SDL3-CS.Tests.csproj"/>
+  </ItemGroup>
+
+  <PropertyGroup Condition=" '$(RuntimeIdentifier)' == '' ">
+    <SDLArch>$([System.Runtime.InteropServices.RuntimeInformation]::OSArchitecture)</SDLArch>
+
+    <!-- If RID is specified -->
+    <SDLNativeLib Condition=" $(RuntimeIdentifier.StartsWith('win')) ">$(RuntimeIdentifier)\SDL3.dll</SDLNativeLib>
+    <SDLNativeLib Condition=" $(RuntimeIdentifier.StartsWith('linux')) ">$(RuntimeIdentifier)\libSDL3.so</SDLNativeLib>
+    <SDLNativeLib Condition=" $(RuntimeIdentifier.StartsWith('osx')) ">$(RuntimeIdentifier)\libSDL3.dylib</SDLNativeLib>
+
+    <!-- If RID is not specified -->
+    <SDLNativeLib Condition=" '$(SDLNativeLib)' == '' And '$([MSBuild]::IsOSPlatform(Windows))' ">win-$(SDLArch.ToLower())\SDL3.dll</SDLNativeLib>
+    <SDLNativeLib Condition=" '$(SDLNativeLib)' == '' And '$([MSBuild]::IsOSPlatform(Linux))' ">linux-$(SDLArch.ToLower())\libSDL3.so</SDLNativeLib>
+    <SDLNativeLib Condition=" '$(SDLNativeLib)' == '' And '$([MSBuild]::IsOSPlatform(OSX))' ">osx-$(SDLArch.ToLower())\libSDL3.dylib</SDLNativeLib>
+  </PropertyGroup>
+
+  <ItemGroup Condition=" '$(SDLNativeLib)' != '' ">
+    <Content Include="$(MSBuildThisFileDirectory)..\native\$(SDLNativeLib)">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+  </ItemGroup>
+
+</Project>

SDL3-CS.Tests/SDL3-CS.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
+    <OutputType>Library</OutputType>
     <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>SDL.Tests</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>

SDL3-CS.sln

@@ -23,6 +23,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SDL3-CS.Android", "SDL3-CS.
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SDL3-CS.Tests.Android", "SDL3-CS.Tests.Android\SDL3-CS.Tests.Android.csproj", "{E8469DA5-E437-4287-9E2A-8B8F4DC21C1A}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SDL3-CS.Tests.Desktop", "SDL3-CS.Tests.Desktop\SDL3-CS.Tests.Desktop.csproj", "{7E8D719A-5B69-43B7-A9D5-385B6FE7F411}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -49,6 +51,10 @@ Global
 		{E8469DA5-E437-4287-9E2A-8B8F4DC21C1A}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{E8469DA5-E437-4287-9E2A-8B8F4DC21C1A}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{E8469DA5-E437-4287-9E2A-8B8F4DC21C1A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{7E8D719A-5B69-43B7-A9D5-385B6FE7F411}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7E8D719A-5B69-43B7-A9D5-385B6FE7F411}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7E8D719A-5B69-43B7-A9D5-385B6FE7F411}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7E8D719A-5B69-43B7-A9D5-385B6FE7F411}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

SDL3-CS/SDL3-CS.csproj

@@ -29,46 +29,38 @@
   </ItemGroup>
 
   <ItemGroup>
-    <Content Include="$(MSBuildThisFileDirectory)..\native\win-x64\SDL3.dll">
+    <None Include="$(MSBuildThisFileDirectory)..\native\win-x64\SDL3.dll">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
       <PackagePath>runtimes/win-x64/native</PackagePath>
       <Pack>true</Pack>
-    </Content>
+    </None>
-    <Content Include="$(MSBuildThisFileDirectory)..\native\win-arm64\SDL3.dll">
+    <None Include="$(MSBuildThisFileDirectory)..\native\win-arm64\SDL3.dll">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
       <PackagePath>runtimes/win-arm64/native</PackagePath>
       <Pack>true</Pack>
-    </Content>
+    </None>
-    <Content Include="$(MSBuildThisFileDirectory)..\native\win-x86\SDL3.dll">
+    <None Include="$(MSBuildThisFileDirectory)..\native\win-x86\SDL3.dll">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
       <PackagePath>runtimes/win-x86/native</PackagePath>
       <Pack>true</Pack>
-    </Content>
+    </None>
-    <Content Include="$(MSBuildThisFileDirectory)..\native\osx-x64\libSDL3.dylib">
+    <None Include="$(MSBuildThisFileDirectory)..\native\osx-x64\libSDL3.dylib">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
       <PackagePath>runtimes/osx-x64/native</PackagePath>
       <Pack>true</Pack>
-    </Content>
+    </None>
-    <Content Include="$(MSBuildThisFileDirectory)..\native\osx-arm64\libSDL3.dylib">
+    <None Include="$(MSBuildThisFileDirectory)..\native\osx-arm64\libSDL3.dylib">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
       <PackagePath>runtimes/osx-arm64/native</PackagePath>
       <Pack>true</Pack>
-    </Content>
+    </None>
-    <Content Include="$(MSBuildThisFileDirectory)..\native\linux-x64\libSDL3.so">
+    <None Include="$(MSBuildThisFileDirectory)..\native\linux-x64\libSDL3.so">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
       <PackagePath>runtimes/linux-x64/native</PackagePath>
       <Pack>true</Pack>
-    </Content>
+    </None>
-    <Content Include="$(MSBuildThisFileDirectory)..\native\linux-x86\libSDL3.so">
+    <None Include="$(MSBuildThisFileDirectory)..\native\linux-x86\libSDL3.so">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
       <PackagePath>runtimes/linux-x86/native</PackagePath>
       <Pack>true</Pack>
-    </Content>
+    </None>
-    <Content Include="$(MSBuildThisFileDirectory)..\native\ios\**\*">
+    <None Include="$(MSBuildThisFileDirectory)..\native\ios\**\*">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
       <PackagePath>runtimes/ios/native</PackagePath>
       <Pack>true</Pack>
-    </Content>
+    </None>
   </ItemGroup>
 
 </Project>