code: def test_predecessor_target(self):
      G = nx.path_graph(4)
      p = nx.predecessor(G, 0, 3)
      assert p == [2]
      p = nx.predecessor(G, 0, 3, cutoff=2)
      assert p == []
      p, s = nx.predecessor(G, 0, 3, return_seen=True)
      assert p == [2]
      assert s == 3
      p, s = nx.predecessor(G, 0, 3, cutoff=2, return_seen=True)
      assert p == []
      assert s == -1
  
file_path: networkx/networkx/algorithms/shortest_paths/tests/test_unweighted.py
imports: import pytest
  import networkx
label_desc: Use image node_id 14 for calling the TestUnweightedPath obj's underlying member method code with example usage: obj.test_predecessor_target() without return types