code: def test_all_pairs_shortest_path_length(self):
      ans = dict(nx.shortest_path_length(self.cycle))
      assert ans[0] == {0: 0, 1: 1, 2: 2, 3: 3, 4: 3, 5: 2, 6: 1}
      assert ans == dict(nx.all_pairs_shortest_path_length(self.cycle))
      ans = dict(nx.shortest_path_length(self.grid))
      assert ans[1][16] == 6
      # now with weights
      ans = dict(nx.shortest_path_length(self.cycle, weight="weight"))
      assert ans[0] == {0: 0, 1: 1, 2: 2, 3: 3, 4: 3, 5: 2, 6: 1}
      assert ans == dict(nx.all_pairs_dijkstra_path_length(self.cycle))
      ans = dict(nx.shortest_path_length(self.grid, weight="weight"))
      assert ans[1][16] == 6
      # weights and method specified
      ans = dict(
          nx.shortest_path_length(
              self.cycle, weight="weight", method="dijkstra"
          )
      )
      assert ans[0] == {0: 0, 1: 1, 2: 2, 3: 3, 4: 3, 5: 2, 6: 1}
      assert ans == dict(nx.all_pairs_dijkstra_path_length(self.cycle))
      ans = dict(
          nx.shortest_path_length(
              self.cycle, weight="weight", method="bellman-ford"
          )
      )
      assert ans[0] == {0: 0, 1: 1, 2: 2, 3: 3, 4: 3, 5: 2, 6: 1}
      assert ans == dict(
          nx.all_pairs_bellman_ford_path_length(self.cycle)
      )
  
imports: import pytest
  import networkx
label_desc: Use image node_id 10 for calling the TestGenericPath obj's underlying member method code with example usage: obj.test_all_pairs_shortest_path_length() without return types