code: def testDup(self):
      self._test_contiguous(MPI.COMBINER_DUP)
  
imports: from mpi4py import MPI
  import mpiunittest
  import arrayimpl
  import os, tempfile
  import platform
label_desc: Use image node_id 4 for calling the BaseTestIOView obj's underlying member method code with example usage: obj.testDup() without return types