code: def setup_class(cls):
      BaseGraphML.setup_class()
      _ = pytest.importorskip("lxml.etree")
  
imports: import io
  import pytest
  import networkx
  from networkx.readwrite.graphml import GraphMLWriter
  from networkx.utils import edges_equal, nodes_equal
label_desc: Use image node_id 1 for calling the TestWriteGraphML obj's underlying member method code with example usage: obj.setup_class(cls) without return types