code: def test_singlewire_pennylane_to_openfermion():
      """Test that _pennylane_to_openfermion function returns the correct Hamiltonian for a
      single-wire case.
      """
      coeffs = np.array([0.5])
      obs_list = [qml.PauliZ(wires=[0])]
  
      op_str = str(
          qml.qchem.convert._pennylane_to_openfermion(coeffs, obs_list)
      )
  
      # Remove new line characters
      op_str = op_str.replace("\n", "")
      assert op_str == "(0.5+0j) [Z0]"
  
imports: import os
  import sys
  import pytest
  import pennylane
  from pennylane import numpy
  from pennylane import qchem
  from pennylane.operation import disable_new_opmath, enable_new_opmath
label_desc: Use image node_id 13 for calling a global function with example usage: test_singlewire_pennylane_to_openfermion() without return types