The tests project is a library, so we have to manually tell it to copy the native libSkiaSharp files

tests/SkiaSharp.Desktop.Tests/SkiaSharp.Desktop.Tests.csproj

@@ -11,6 +11,7 @@
     <AssemblyName>SkiaSharp.Desktop.Tests</AssemblyName>
     <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
+    <ShouldIncludeNativeSkiaSharp>True</ShouldIncludeNativeSkiaSharp>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>