code: def test_forward_execution():
      """Compare the foward execution to an exactly known result."""
      dev = qml.device("default.qubit", wires=2)
  
      H = qml.PauliX(0) @ qml.PauliY(1) - 1.0 * qml.PauliY(
          0
      ) @ qml.PauliX(1)
      freq = (2, 4)
  
      @qml.qnode(dev, diff_method=None)
      def circuit(time):
          qml.PauliX(0)
          qml.CommutingEvolution(H, time, freq)
          return qml.expval(qml.PauliZ(0))
  
      t = 1.0
      res = circuit(t)
      expected = -np.cos(4)
      assert np.allclose(res, expected)
  
file_path: pennylane/tests/templates/test_subroutines/test_commuting_evolution.py
imports: import pytest
  from scipy.linalg import expm
  import pennylane
  from pennylane import numpy
label_desc: Use image node_id 6 for calling a global function with example usage: test_forward_execution() and returns: qml