Dotnet test task is taking long time and getting failed (Stdio did not close within 10 sec)

An old colleague of mine had similar issue. After a long series of troubleshooting, this was what resolved it. We replaced the DotNetCoreCLI@2 task with a 'powershell' task.

- powershell: |
    dotnet test your.dll --no-restore --logger trx
  displayName: dotnet2powershelltest

Let me know if this resolved your issue.