fully parallelize tests

Author: Insire

Directory.Packages.props

@@ -57,6 +57,7 @@
     <PackageVersion Include="xunit.v3.extensibility.core" Version="3.1.0" />
     <PackageVersion Include="Microsoft.Testing.Extensions.CodeCoverage" Version="17.14.2" />
     <PackageVersion Include="OpenTelemetry.Extensions.Hosting" Version="1.13.1" />
+    <PackageVersion Include="Meziantou.Xunit.v3.ParallelTestFramework" Version="1.0.6" />
   </ItemGroup>
   <!-- cake -->
   <ItemGroup Label="cake">

MvvmScarletToolkit.slnx

@@ -33,6 +33,8 @@
     <File Path="README.md" />
     <File Path="targetframeworks-windows.props" />
     <File Path="targetframeworks.props" />
+    <File Path="tests/test-libraries.props" />
+    <File Path="tests/xunit.runner.json" />
     <File Path="version.json" />
   </Folder>
   <Folder Name="/src/">

tests/test-libraries.props

@@ -12,6 +12,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Meziantou.Xunit.v3.ParallelTestFramework" />
     <PackageReference Include="Microsoft.Testing.Extensions.CodeCoverage" />
     <PackageReference Include="NSubstitute" />
     <PackageReference Include="NSubstitute.Analyzers.CSharp" />

tests/xunit.runner.json

@@ -4,5 +4,6 @@
     "parallelizeAssembly": true,
     "showLiveOutput": true,
     "parallelizeTestCollections": true,
-    "parallelAlgorithm": "aggressive"
+    "parallelAlgorithm": "aggressive",
+    "preEnumerateTheories": true
 }