code: def test_path_graph(self):
      p = nx.path_graph(0)
      assert is_isomorphic(p, nx.null_graph())
  
      p = nx.path_graph(1)
      assert is_isomorphic(p, nx.empty_graph(1))
  
      p = nx.path_graph(10)
      assert nx.is_connected(p)
      assert sorted(d for n, d in p.degree()) == [
          1,
          1,
          2,
          2,
          2,
          2,
          2,
          2,
          2,
          2,
      ]
      assert p.order() - 1 == p.size()
  
      dp = nx.path_graph(3, create_using=nx.DiGraph)
      assert dp.has_edge(0, 1)
      assert not dp.has_edge(1, 0)
  
      mp = nx.path_graph(10, create_using=nx.MultiGraph)
      assert edges_equal(mp.edges(), p.edges())
  
      G = nx.path_graph("abc")
      assert len(G) == 3
      assert G.size() == 2
      G = nx.path_graph("abcb")
      assert len(G) == 3
      assert G.size() == 2
      g = nx.path_graph("abc", nx.DiGraph)
      assert len(g) == 3
      assert g.size() == 2
      assert g.is_directed()
      g = nx.path_graph("abcb", nx.DiGraph)
      assert len(g) == 3
      assert g.size() == 3
  
      G = nx.path_graph((1, 2, 3, 2, 4))
      assert G.has_edge(2, 4)
  
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 28 for calling the TestGeneratorClassic obj's underlying member method code with example usage: obj.test_path_graph() without return types