code: def test_astar_w1(self):
      G = nx.DiGraph()
      G.add_edges_from(
          [
              ("s", "u"),
              ("s", "x"),
              ("u", "v"),
              ("u", "x"),
              ("v", "y"),
              ("x", "u"),
              ("x", "w"),
              ("w", "v"),
              ("x", "y"),
              ("y", "s"),
              ("y", "v"),
          ]
      )
      assert nx.astar_path(G, "s", "v") == ["s", "u", "v"]
      assert nx.astar_path_length(G, "s", "v") == 2
  
imports: import pytest
  import networkx
  from networkx.utils import pairwise
label_desc: Use image node_id 12 for calling the TestAStar obj's underlying member method code with example usage: obj.test_astar_w1() without return types