code: def test_closing(self, r):
      with closing(r.pipeline()):
          pass
  
imports: from contextlib import closing
  from unittest import mock
  import pytest
  import redis
  from .conftest import skip_if_server_version_lt, wait_for_command
label_desc: Use image node_id 21 for calling the TestPipeline obj's underlying member method code with example usage: obj.test_closing(r) without return types