code: def test_adjoint_method_involution(op):
      """Assert that involution ops are their own adjoint."""
      assert op.has_adjoint
  
      adj_op = op.adjoint()
      assert qml.equal(adj_op, op)
      assert adj_op is not op
  
imports: import copy
  import pytest
  import numpy
  from gate_data import TSHIFT, TCLOCK, TADD, TSWAP, TH
  import pennylane
  from pennylane.wires import Wires
label_desc: Use image node_id 4 for calling a global function with example usage: test_adjoint_method_involution(op) without return types