code: def test_astar_directed(self):
      assert nx.astar_path(self.XG, "s", "v") == ["s", "x", "u", "v"]
      assert nx.astar_path_length(self.XG, "s", "v") == 9
  
imports: import pytest
  import networkx
  from networkx.utils import pairwise
label_desc: Use image node_id 3 for calling the TestAStar obj's underlying member method code with example usage: obj.test_astar_directed() without return types