code: def test_observable(
      fermion_ops,
      init_term,
      mapping,
      terms_exp,
      custom_wires,
      monkeypatch,
  ):
      r"""Tests the correctness of the 'observable' function used to build many-body observables.
  
      The parametrized inputs `terms_exp` are `.terms` attribute of the corresponding
      `QubitOperator. The equality checking is implemented in the `qchem` module itself
      as it could be something useful to the users as well.
      """
      # pylint: disable=protected-access
  
      res_obs = qchem.observable(
          fermion_ops,
          init_term=init_term,
          mapping=mapping,
          wires=custom_wires,
      )
  
      qubit_op = QubitOperator()
      monkeypatch.setattr(qubit_op, "terms", terms_exp)
  
      assert qml.qchem.convert._openfermion_pennylane_equivalent(
          qubit_op, res_obs, wires=custom_wires
      )
  
imports: import sys
  import pytest
  import pennylane
  from pennylane import qchem
label_desc: Use image node_id 1 for calling a global function with example usage: test_observable(fermion_ops, init_term, mapping, terms_exp, custom_wires, monkeypatch) without return types