code: def test_adjoint_method(op):
      """Tests the adjoint method for operations that are their own adjoint."""
      adj_op = copy.copy(op)
      for _ in range(4):
          adj_op = adj_op.adjoint()
  
          assert qml.equal(adj_op, op)
  
imports: import copy
  import numpy
  import pytest
  from scipy.linalg import fractional_matrix_power
  from scipy.sparse import csr_matrix
  from scipy.stats import unitary_group
  from gate_data import CY, CZ
  import pennylane
  from pennylane.wires import Wires
  from pennylane.operation import AnyWires
  from pennylane.ops.qubit.matrix_ops import QubitUnitary
label_desc: Use image node_id 3 for calling a global function with example usage: test_adjoint_method(op) without return types