code: def test_exceptions_optimal_sector(
      symbols, geometry, generators, num_electrons, msg_match
  ):
      r"""Test that find_optimal_sector returns the correct result."""
      mol = qml.qchem.Molecule(symbols, geometry)
      hamiltonian = qml.qchem.diff_hamiltonian(mol)()
  
      with pytest.raises(ValueError, match=msg_match):
          optimal_sector(hamiltonian, generators, num_electrons)
  
imports: import functools
  import pytest
  import scipy
  import pennylane
  from pennylane import numpy
  from pennylane.pauli import pauli_sentence
  from pennylane.qchem.tapering import _kernel, _reduced_row_echelon, clifford, optimal_sector, taper_hf, taper_operation, _split_pauli_sentence, _taper_pauli_sentence
  from pennylane.operation import enable_new_opmath, disable_new_opmath
label_desc: Use image node_id 8 for calling a global function with example usage: test_exceptions_optimal_sector(symbols, geometry, generators, num_electrons, msg_match) without return types