code: def test_none_return_type():
      """Test that a measurement process without a return type property has return_type
      `None`"""
  
      class NoReturnTypeMeasurement(MeasurementProcess):
          """Dummy measurement process with no return type."""
  
      mp = NoReturnTypeMeasurement()
      assert mp.return_type is None
  
imports: import numpy
  import pytest
  import pennylane
  from pennylane.measurements import ClassicalShadowMP, Counts, CountsMP, Expectation, ExpectationMP, MeasurementProcess, MeasurementTransform, MeasurementValue, MidMeasure, MidMeasureMP, MutualInfoMP, PurityMP, Probability, ProbabilityMP, Sample, SampleMeasurement, SampleMP, ShadowExpvalMP, Shots, State, StateMeasurement, StateMP, Variance, VarianceMP, VnEntropyMP, expval, sample, var
  from pennylane.operation import DecompositionUndefinedError
  from pennylane.queuing import AnnotatedQueue
  from pennylane.wires import Wires
label_desc: Use image node_id 5 for calling a global function with example usage: test_none_return_type() without return types