code: def test_identities_pennylane_to_openfermion():
      """Test that tensor products that contain Identity instances are handled
      correctly by the _pennylane_to_openfermion function.
  
      A decomposition of the following observable was used:
      [[1 0 0 0]
       [0 2 0 0]
       [0 0 3 0]
       [0 0 0 4]]
      """
      coeffs = [2.5, -0.5, -1.0]
      obs_list = [
          qml.Identity(wires=[0]) @ qml.Identity(wires=[1]),
          qml.Identity(wires=[0]) @ qml.PauliZ(wires=[1]),
          qml.PauliZ(wires=[0]) @ qml.Identity(wires=[1]),
      ]
  
      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 == "(2.5+0j) [] +(-1+0j) [Z0] +(-0.5+0j) [Z1]"
  
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 12 for calling a global function with example usage: test_identities_pennylane_to_openfermion() without return types