docstr: Test valid initialization cases.
docstr_tok: ["Test","valid","initialization","cases","."]
code: def test_ValidInitializationCases(self):
      """Test valid initialization cases."""
      IntensityRangeStandardization()
      IntensityRangeStandardization(
          landmarkp=IntensityRangeStandardization.L2
      )
      IntensityRangeStandardization(
          landmarkp=IntensityRangeStandardization.L3
      )
      IntensityRangeStandardization(
          landmarkp=IntensityRangeStandardization.L4
      )
      IntensityRangeStandardization(landmarkp=(50,))
      IntensityRangeStandardization(landmarkp=[50])
      IntensityRangeStandardization(landmarkp=numpy.asarray([50]))
  
file_path: medpy/tests/filter_/IntensityRangeStandardization.py
imports: import unittest
  import tempfile
  import pickle
  import numpy
  from medpy.filter import IntensityRangeStandardization, UntrainedException, InformationLossException, SingleIntensityAccumulationError
label_desc: Use image node_id 1 for calling the TestIntensityRangeStandardization obj's underlying member method code with example usage: obj.test_ValidInitializationCases() without return types