code: def test_decomposition_expand():
      """Test that the decomposition of CommutingEvolution is an ApproxTimeEvolution with one step."""
  
      hamiltonian = 0.5 * qml.PauliX(0) @ qml.PauliY(1)
      time = 2.345
  
      op = qml.CommutingEvolution(hamiltonian, time)
  
      decomp = op.decomposition()[0]
  
      assert isinstance(decomp, qml.ApproxTimeEvolution)
      assert all(
          decomp.hyperparameters["hamiltonian"].coeffs
          == hamiltonian.coeffs
      )
      assert decomp.hyperparameters["n"] == 1
  
      tape = op.expand()
      assert len(tape) == 1
      assert isinstance(tape[0], qml.ApproxTimeEvolution)
  
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 4 for calling a global function with example usage: test_decomposition_expand() without return types