eng/Coverage.targets

<Project>

  <PropertyGroup>
    <CoverageFormat Condition="'$(CoverageFormat)' == ''">cobertura</CoverageFormat>
    <CoverageOutputPath Condition="'$(CoverageOutputPath)' == ''">coverage.cobertura.xml</CoverageOutputPath>
  </PropertyGroup>

  <PropertyGroup>
    <CoverletId />
  </PropertyGroup>

  <Target Name="BeforeCollectCodeCoverage" BeforeTargets="RunTests">
    <BeforeCollectCodeCoverageTask TestAssembly="%(TestToRun.Identity)" PipeName="%(TestToRun.Filename)">
      <Output TaskParameter="CoverletId" PropertyName="CoverletId" />
    </BeforeCollectCodeCoverageTask>
  </Target>

  <Target Name="AfterCollectCodeCoverage" AfterTargets="RunTests">
    <AfterCollectCodeCoverageTask PipeName="%(TestToRun.Filename)" CoverletId="$(CoverletId)" />
    <!-- <Exec Command="$(DotNetTool) tool run codecov -f '$(CoverageOutputPath)'" /> -->
  </Target>

  <UsingTask
    TaskName="BeforeCollectCodeCoverageTask"
    TaskFactory="RoslynCodeTaskFactory"
    AssemblyName="Microsoft.Build.Tasks.Core">

    <ParameterGroup>
      <TestAssembly ParameterType="System.String" Required="true" />
      <PipeName ParameterType="System.String" Required="true" />
      <CoverletId ParameterType="System.Int32" Output="true" />
    </ParameterGroup>

    <Task>
      <Using Namespace="System.Diagnostics" />
      <Using Namespace="System.IO.Pipes" />
      <Code>
        Log.LogMessage(MessageImportance.High, $"Collecting code coverage for {PipeName} .");

        using var coverlet = Process.Start(
          @"$(DotNetTool)",
          $@"tool run coverlet ""{TestAssembly}"" " +
          @"--format $(CoverageFormat) " +
          @"--output ""$(CoverageOutputPath)"" " +
          @"--target ""$(DotNetTool)"" " +
          @"--targetargs ""tool run pwsh " +
          $"$server = [System.IO.Pipes.NamedPipeServerStream]::new('{PipeName}');" +
          "$server.WaitForConnection();" +
          "$server.ReadByte();" +
          "$server.Disconnect();" +
          "$server.WaitForConnection();" +
          "$server.Disconnect();" +
          @"""");
        CoverletId = coverlet.Id;

        Log.LogMessage(MessageImportance.High, $"Collecting code coverage for {PipeName} ..");

        using var client = new NamedPipeClientStream(PipeName);
        client.Connect();
        client.WriteByte(0);

        Log.LogMessage(MessageImportance.High, $"Collecting code coverage for {PipeName} ...");
      </Code>
    </Task>

  </UsingTask>

  <UsingTask
    TaskName="AfterCollectCodeCoverageTask"
    TaskFactory="RoslynCodeTaskFactory"
    AssemblyName="Microsoft.Build.Tasks.Core">

    <ParameterGroup>
      <PipeName ParameterType="System.String" Required="true" />
      <CoverletId ParameterType="System.Int32" Required="true" />
    </ParameterGroup>

    <Task>
      <Using Namespace="System.Diagnostics" />
      <Using Namespace="System.IO.Pipes" />
      <Code>
        Log.LogMessage(MessageImportance.High, $"Collecting code coverage for {PipeName} ....");

        using var client = new NamedPipeClientStream(PipeName);
        client.Connect();

        Log.LogMessage(MessageImportance.High, $"Collecting code coverage for {PipeName} .....");

        using var coverlet = Process.GetProcessById(CoverletId);
        coverlet.WaitForExit();

        Log.LogMessage(MessageImportance.High, $"Collecting code coverage for {PipeName} ......");
      </Code>
    </Task>

  </UsingTask>

</Project>