new_contents: from lektor.publisher import Command
  
  
  def test_Command_triggers_no_warnings(recwarn):
      # This excercises the issue where publishing via rsync resulted
      # in ResourceWarnings about unclosed streams.
  
      # This is essentially how RsyncPublisher runs rsync.
      with Command(["echo"]) as client:
          for _ in client:
              pass
      # Delete our reference so that the Command instance gets garbage
      # collected here. Otherwise, gc will not happen until after the
      # test completes and warnings emitted during gc will not be captured
      # by the recwarn fixture.
      del client
  
      for warning in recwarn.list:
          print(warning)
      assert len(recwarn) == 0
  
subject: Add test to excercise unclosed file warnings