code: def test_pauli_operators_multiplication_with_labels():
      assert qsimplify_pauli(sx1 * sx1) == 1
      assert qsimplify_pauli(sy1 * sy1) == 1
      assert qsimplify_pauli(sz1 * sz1) == 1
  
      assert isinstance(sx1 * sx2, Mul)
      assert isinstance(sy1 * sy2, Mul)
      assert isinstance(sz1 * sz2, Mul)
  
      assert qsimplify_pauli(sx1 * sy1 * sx2 * sy2) == -sz1 * sz2
      assert qsimplify_pauli(sy1 * sz1 * sz2 * sx2) == -sx1 * sy2
  
file_path: sympy/sympy/physics/quantum/tests/test_pauli.py
imports: from sympy.core.mul import Mul
  from sympy.core.numbers import I
  from sympy.matrices.dense import Matrix
  from sympy.printing.latex import latex
  from sympy.physics.quantum import Dagger, Commutator, AntiCommutator, qapply, Operator, represent
  from sympy.physics.quantum.pauli import SigmaOpBase, SigmaX, SigmaY, SigmaZ, SigmaMinus, SigmaPlus, qsimplify_pauli
  from sympy.physics.quantum.pauli import SigmaZKet, SigmaZBra
  from sympy.testing.pytest import raises
label_desc: Use image node_id 8 for calling a global function with example usage: test_pauli_operators_multiplication_with_labels() without return types