code: def test_writer_arg2default_fobj_path_none(self):
      self.writer_arg2default(0, path=None)
  
imports: import os
  import pathlib
  import random
  import tempfile
  import pytest
  import networkx
  from networkx.utils.decorators import argmap, not_implemented_for, np_random_state, open_file, py_random_state
  from networkx.utils.misc import PythonRandomInterface
label_desc: Use image node_id 17 for calling the TestOpenFileDecorator obj's underlying member method code with example usage: obj.test_writer_arg2default_fobj_path_none() without return types