code: def test_dijkstra_predecessor1(self):
      G = nx.path_graph(4)
      assert nx.dijkstra_predecessor_and_distance(G, 0) == (
          {0: [], 1: [0], 2: [1], 3: [2]},
          {0: 0, 1: 1, 2: 2, 3: 3},
      )
  
imports: import pytest
  import networkx
  from networkx.utils import pairwise
label_desc: Use image node_id 6 for calling the TestWeightedPath obj's underlying member method code with example usage: obj.test_dijkstra_predecessor1() without return types