code: def test_read_gml(self, tmp_path):
      fname = tmp_path / "test.gml"
      with open(fname, "w") as fh:
          fh.write(self.simple_data)
      Gin = nx.read_gml(fname, label="label")
      G = nx.parse_gml(self.simple_data, label="label")
      assert sorted(G.nodes(data=True)) == sorted(Gin.nodes(data=True))
      assert sorted(G.edges(data=True)) == sorted(Gin.edges(data=True))
  
imports: import codecs
  import io
  import math
  from ast import literal_eval
  from contextlib import contextmanager
  from textwrap import dedent
  import pytest
  import networkx
  from networkx.readwrite.gml import literal_destringizer, literal_stringizer
label_desc: Use image node_id 4 for calling the TestGraph obj's underlying member method code with example usage: obj.test_read_gml(tmp_path) without return types