code: def test_matrix():
      """Test that the matrix of commuting evolution is the same as exponentiating -1j * t the hamiltonian."""
  
      h = 2.34 * qml.PauliX(0)
      time = 0.234
      op = qml.CommutingEvolution(h, time)
  
      mat = qml.matrix(op)
  
      expected = expm(-1j * time * qml.matrix(h))
  
      assert qml.math.allclose(mat, 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 5 for calling a global function with example usage: test_matrix() without return types