code: def setup_class(cls):
      cls.K3 = G = nx.complete_graph(3)
      G.graph["foo"] = []
      G.nodes[0]["foo"] = []
      G.remove_edge(1, 2)
      ll = []
      G.add_edge(1, 2, foo=ll)
      G.add_edge(2, 1, foo=ll)
  
imports: import pytest
  import networkx
  from networkx.utils import edges_equal
label_desc: Use image node_id 1 for calling the TestInducedSubGraph obj's underlying member method code with example usage: obj.setup_class(cls) without return types