code: def return_type(self):
      return "NotValidReturnType"
  
file_path: pennylane/tests/measurements/legacy/test_measurements_legacy.py
imports: import pytest
  import pennylane
  from pennylane.measurements import ClassicalShadowMP, MeasurementProcess, MeasurementTransform, SampleMeasurement, SampleMP, Shots, StateMeasurement, StateMP, expval, var
label_desc: Use image node_id 1 for calling the NotValidMeasurement obj's underlying member method code with example usage: obj.return_type() and returns: str