code: def test_jordan_wigner_for_null_operator_fermi_word_ps(operator):
      """Test that the jordan_wigner function works when the result is 0"""
      # in PauliSentence return format, returns None
      assert jordan_wigner(operator, ps=True).simplify() is None
  
      # in operation return format, '0 * I'
      op = jordan_wigner(operator).simplify()
  
      assert isinstance(op, SProd)
      assert isinstance(op.base, Identity)
      assert op.scalar == 0
  
imports: import pytest
  import pennylane
  from pennylane.ops import SProd, Identity
  from pennylane.pauli.conversion import pauli_sentence
  from pennylane.fermi.conversion import jordan_wigner
  from pennylane.pauli import PauliWord, PauliSentence
  from pennylane.fermi.fermionic import FermiWord, FermiSentence
label_desc: Use image node_id 5 for calling a global function with example usage: test_jordan_wigner_for_null_operator_fermi_word_ps(operator) without return types