code: def test_trivial_graph(self):
      assert nx.number_of_nodes(nx.trivial_graph()) == 1
  
imports: import itertools
  import typing
  import pytest
  import networkx
  from networkx.algorithms.isomorphism.isomorph import graph_could_be_isomorphic
  from networkx.utils import edges_equal, nodes_equal
label_desc: Use image node_id 39 for calling the TestGeneratorClassic obj's underlying member method code with example usage: obj.test_trivial_graph() without return types