arcade code coverage changes

Author: Keren Fuentes

Directory.Build.targets

@@ -2,6 +2,10 @@
 <Project>
   <Import Project="Sdk.targets" Sdk="Microsoft.DotNet.Arcade.Sdk" />
 
+  <ItemGroup Condition="'$(IsUnitTestProject)' == 'true'">
+    <PackageReference Include="coverlet.msbuild" Version="2.9.0" PrivateAssets="all" />
+  </ItemGroup>
+
   <Target Name="CopyNativeAssembiles" AfterTargets="CopyFilesToOutputDirectory">
     <PropertyGroup>
 		<LibPrefix Condition="'$(OS)' != 'Windows_NT'">lib</LibPrefix>
@@ -35,5 +39,45 @@
 		<Output TaskParameter="DestinationFiles" ItemName="FileWrites"/>
 		</Copy>
   </Target>
+  <PropertyGroup Condition="'$(Coverage)' == 'true'">
+    <!-- https://github.com/tonerdo/coverlet/issues/363 -->
+    <DeterministicSourcePaths>false</DeterministicSourcePaths>
+
+    <!-- https://github.com/tonerdo/coverlet/issues/618 -->
+    <IncludeTestAssembly>true</IncludeTestAssembly>
+
+    <CollectCoverage>true</CollectCoverage>
+    <SingleHit>true</SingleHit>
+    <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
+    <CoverletOutputFormat>opencover</CoverletOutputFormat>
+    <CoverletOutput>$(BaseOutputPath)$(PlatformConfig)\coverage\coverage.opencover.xml</CoverletOutput>
+    <Include></Include>
+    <Exclude></Exclude>
+    <ExcludeByAttribute>ExcludeFromCodeCoverage</ExcludeByAttribute>
+    <ExcludeByFile></ExcludeByFile>
+  </PropertyGroup>
+
+  <Target Name="OuterInstrumentModulesNoBuild" BeforeTargets="RunTests" Condition="'$(IsUnitTestProject)' == 'true' AND '$(TargetFramework)' == ''">
+    <MSBuild
+      Projects="$(MSBuildProjectFullPath)"
+      Targets="InnerInstrumentModulesNoBuild"
+      Properties="TargetFramework=%(_TargetFramework.Identity)" />
+  </Target>
+
+  <Target Name="OuterGenerateCoverageResult" BeforeTargets="Test" Condition="'$(IsUnitTestProject)' == 'true' AND '$(TargetFramework)' == ''">
+    <MSBuild
+      Projects="$(MSBuildProjectFullPath)"
+      Targets="InnerGenerateCoverageResult"
+      Properties="TargetFramework=%(_TargetFramework.Identity)" />
+  </Target>
+
+  <Target Name="InnerInstrumentModulesNoBuild"
+          BeforeTargets="RunTests"
+          DependsOnTargets="InstrumentModules"
+          Condition="'$(IsUnitTestProject)' == 'true' AND '$(TargetFramework)' != '' AND '$(CollectCoverage)' == 'true'" />
 
+  <Target Name="InnerGenerateCoverageResult"
+          BeforeTargets="Test"
+          DependsOnTargets="GenerateCoverageResult"
+          Condition="'$(IsUnitTestProject)' == 'true' AND '$(TargetFramework)' != '' AND '$(CollectCoverage)' == 'true'" />
 </Project>