code: def test_key_raises(self):
      s = """<?xml version="1.0" encoding="UTF-8"?>
  <gexf xmlns="http://www.gexf.net/1.2draft" version='1.2'>
      <graph mode="static" defaultedgetype="directed" name="">
          <nodes>
              <node id="0" label="Hello">
                <attvalues>
                  <attvalue for='0' value='1'/>
                </attvalues>
              </node>
              <node id="1" label="Word" />
          </nodes>
          <edges>
              <edge id="0" source="0" target="1" type="undirected"/>
          </edges>
      </graph>
  </gexf>
  """
      fh = io.BytesIO(s.encode("UTF-8"))
      pytest.raises(nx.NetworkXError, nx.read_gexf, fh)
  
imports: import io
  import time
  import pytest
  import networkx
label_desc: Use image node_id 8 for calling the TestGEXF obj's underlying member method code with example usage: obj.test_key_raises() without return types