code: def test_default_attribute(self):
      G = nx.Graph()
      G.add_node(1, label="1", color="green")
      nx.add_path(G, [0, 1, 2, 3])
      G.add_edge(1, 2, foo=3)
      G.graph["node_default"] = {"color": "yellow"}
      G.graph["edge_default"] = {"foo": 7}
      fh = io.BytesIO()
      nx.write_gexf(G, fh)
      fh.seek(0)
      H = nx.read_gexf(fh, node_type=int)
      assert sorted(G.nodes()) == sorted(H.nodes())
      assert sorted(sorted(e) for e in G.edges()) == sorted(
          sorted(e) for e in H.edges()
      )
      # Reading a gexf graph always sets mode attribute to either
      # 'static' or 'dynamic'. Remove the mode attribute from the
      # read graph for the sake of comparing remaining attributes.
      del H.graph["mode"]
      assert G.graph == H.graph
  
imports: import io
  import time
  import pytest
  import networkx
label_desc: Use image node_id 10 for calling the TestGEXF obj's underlying member method code with example usage: obj.test_default_attribute() without return types