code: def test_fermi_sentence_identity():
      """Test that a FermiSentence composed of a single Identity operator
      converts to PauliSentence and operation as expected"""
      op = FermiSentence({fw4: 1})
      ps = PauliSentence({PauliWord({}): 1})
  
      ps_op = jordan_wigner(op, ps=True)
      qubit_op = jordan_wigner(op)
  
      assert ps_op == ps
  
      result = ps.operation(wire_order=[0])
      assert qml.equal(qubit_op.simplify(), result.simplify())
  
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 7 for calling a global function with example usage: test_fermi_sentence_identity() without return types