code: def test_relabel_duplicate(self):
      data = """
  graph
  [
          label   ""
          directed        1
          node
          [
                  id      0
                  label   "same"
          ]
          node
          [
                  id      1
                  label   "same"
          ]
  ]
  """
      fh = io.BytesIO(data.encode("UTF-8"))
      fh.seek(0)
      pytest.raises(nx.NetworkXError, nx.read_gml, fh, label="label")
  
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 6 for calling the TestGraph obj's underlying member method code with example usage: obj.test_relabel_duplicate() without return types