code: def test_escape_unescape(self):
      gml = """graph [
    name "&amp;&#34;&#xf;&#x4444;&#1234567890;&#x1234567890abcdef;&unknown;"
  ]"""
      G = nx.parse_gml(gml)
      assert (
          '&"\x0f'
          + chr(0x4444)
          + "&#1234567890;&#x1234567890abcdef;&unknown;"
          == G.name
      )
      gml = "\n".join(nx.generate_gml(G))
      alnu = "#1234567890;&#38;#x1234567890abcdef"
      answer = (
          """graph [
    name "&#38;&#34;&#15;&#17476;&#38;"""
          + alnu
          + """;&#38;unknown;"
  ]"""
      )
      assert answer == gml
  
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 15 for calling the TestGraph obj's underlying member method code with example usage: obj.test_escape_unescape() without return types