code: def test_exception_import_operator(qubit_op, tol):
      r"""Test that a warning is raised if the QubitOperator contains complex coefficients.
      Currently, the Hamiltonian class does not support complex coefficients.
      """
      with pytest.warns(
          UserWarning,
          match="The coefficients entering the QubitOperator must be real",
      ):
          qml.qchem.convert.import_operator(
              qubit_op, "openfermion", tol=tol
          )
  
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 11 for calling a global function with example usage: test_exception_import_operator(qubit_op, tol) without return types