code: def test_predecessor_T1_in_fail(self):
      G1 = nx.DiGraph(
          [
              (0, 1),
              (0, 3),
              (4, 0),
              (1, 5),
              (5, 2),
              (3, 6),
              (4, 6),
              (6, 5),
          ]
      )
      mapped = {0: "a", 1: "b", 2: "c", 3: "d", 4: "e", 5: "f", 6: "g"}
      G2 = nx.relabel_nodes(G1, mapped)
      l1 = {n: "blue" for n in G1.nodes()}
      l2 = {n: "blue" for n in G2.nodes()}
  
      gparams = _GraphParameters(
          G1, G2, l1, l2, nx.utils.groups(l1), nx.utils.groups(l2), None
      )
      sparams = _StateParameters(
          {0: "a", 1: "b", 2: "c"},
          {"a": 0, "b": 1, "c": 2},
          {3, 5},
          {4, 5},
          {6},
          None,
          {"d", "f"},
          {"f"},  # mapped[4] is missing from T2_in
          {"g"},
          None,
      )
  
      u, v = 6, "g"
      assert _cut_PT(u, v, gparams, sparams)
  
      sparams.T2_in.add("e")
      assert not _cut_PT(u, v, gparams, sparams)
  
imports: import itertools
  import pytest
  import networkx
  from networkx import vf2pp_is_isomorphic, vf2pp_isomorphism
  from networkx.algorithms.isomorphism.vf2pp import _consistent_PT, _cut_PT, _feasibility, _find_candidates, _find_candidates_Di, _GraphParameters, _initialize_parameters, _matching_order, _restore_Tinout, _restore_Tinout_Di, _StateParameters, _update_Tinout
label_desc: Use image node_id 9 for calling the TestDiGraphISOFeasibility obj's underlying member method code with example usage: obj.test_predecessor_T1_in_fail() without return types