code: def test_shortest_path(self):
      assert nx.shortest_path(self.cycle, 0, 3) == [0, 1, 2, 3]
      assert nx.shortest_path(self.cycle, 0, 4) == [0, 6, 5, 4]
      validate_grid_path(
          4, 4, 1, 12, nx.shortest_path(self.grid, 1, 12)
      )
      assert nx.shortest_path(self.directed_cycle, 0, 3) == [0, 1, 2, 3]
      # now with weights
      assert nx.shortest_path(self.cycle, 0, 3, weight="weight") == [
          0,
          1,
          2,
          3,
      ]
      assert nx.shortest_path(self.cycle, 0, 4, weight="weight") == [
          0,
          6,
          5,
          4,
      ]
      validate_grid_path(
          4,
          4,
          1,
          12,
          nx.shortest_path(self.grid, 1, 12, weight="weight"),
      )
      assert nx.shortest_path(
          self.directed_cycle, 0, 3, weight="weight"
      ) == [
          0,
          1,
          2,
          3,
      ]
      # weights and method specified
      assert nx.shortest_path(
          self.directed_cycle, 0, 3, weight="weight", method="dijkstra"
      ) == [0, 1, 2, 3]
      assert nx.shortest_path(
          self.directed_cycle,
          0,
          3,
          weight="weight",
          method="bellman-ford",
      ) == [0, 1, 2, 3]
      # when Dijkstra's will probably (depending on precise implementation)
      # incorrectly return [0, 1, 3] instead
      assert nx.shortest_path(
          self.neg_weights, 0, 3, weight="weight", method="bellman-ford"
      ) == [0, 2, 3]
      # confirm bad method rejection
      pytest.raises(
          ValueError, nx.shortest_path, self.cycle, method="SPAM"
      )
      # confirm absent source rejection
      pytest.raises(nx.NodeNotFound, nx.shortest_path, self.cycle, 8)
  
imports: import pytest
  import networkx
label_desc: Use image node_id 2 for calling the TestGenericPath obj's underlying member method code with example usage: obj.test_shortest_path() without return types