code: def test_ladder_graph(self):
      for i, G in [
          (0, nx.empty_graph(0)),
          (1, nx.path_graph(2)),
          (2, nx.hypercube_graph(2)),
          (10, nx.grid_graph([2, 10])),
      ]:
          assert is_isomorphic(nx.ladder_graph(i), G)
  
      pytest.raises(
          nx.NetworkXError, nx.ladder_graph, 2, create_using=nx.DiGraph
      )
  
      g = nx.ladder_graph(2)
      mg = nx.ladder_graph(2, create_using=nx.MultiGraph)
      assert edges_equal(mg.edges(), g.edges())
  
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 19 for calling the TestGeneratorClassic obj's underlying member method code with example usage: obj.test_ladder_graph() without return types