code: def test_const_mixed_covered_uncovered_neighbors(self):
      G1 = nx.DiGraph([(0, 1), (1, 2), (3, 0), (3, 2), (3, 4), (3, 5)])
      G2 = nx.DiGraph(
          [
              ("a", "b"),
              ("b", "c"),
              ("k", "a"),
              ("k", "c"),
              ("k", "w"),
              ("k", "z"),
          ]
      )
      gparams = _GraphParameters(G1, G2, None, None, None, None, None)
      sparams = _StateParameters(
          {0: "a", 1: "b", 2: "c"},
          {"a": 0, "b": 1, "c": 2},
          None,
          None,
          None,
          None,
          None,
          None,
          None,
          None,
      )
      u, v = 3, "k"
      assert _consistent_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 3 for calling the TestDiGraphISOFeasibility obj's underlying member method code with example usage: obj.test_const_mixed_covered_uncovered_neighbors() without return types