Add code coverage report

Author: bytedreamer

ci/testing.yml

@@ -10,4 +10,18 @@
   inputs:
     command: 'test'
     projects: 'test/*Tests/*.csproj'
-    arguments: '--configuration $(buildConfiguration)'
+    arguments: '--configuration $(buildConfiguration)' --collect:"XPlat Code Coverage"'
+
+- task: reportgenerator@5
+  displayName: 'Generate Code Coverage Report'
+  inputs:
+    reports: '$(Agent.TempDirectory)/**/coverage.cobertura.xml'
+    targetdir: '$(Build.SourcesDirectory)/coveragereport'
+    reporttypes: 'Cobertura;HtmlInline_AzurePipelines'
+
+- task: PublishCodeCoverageResults@1
+  displayName: 'Publish Code Coverage Results'
+  inputs:
+    codeCoverageTool: 'Cobertura'
+    summaryFileLocation: '$(Build.SourcesDirectory)/coveragereport/Cobertura.xml'
+    reportDirectory: '$(Build.SourcesDirectory)/coveragereport'

test/Core.Tests/Core.Tests.csproj

@@ -13,6 +13,10 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.4">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
     <PackageReference Include="Moq" Version="4.20.72" />
     <PackageReference Include="nunit" Version="4.3.2" />
     <PackageReference Include="NUnit3TestAdapter" Version="5.0.0">