code: def testReduceScatter(self):
      super().testReduceScatter()
  
imports: from mpi4py import MPI
  import mpiunittest
  import arrayimpl
  from functools import reduce
label_desc: Use image node_id 1 for calling the TestCCOBufInplaceWorld obj's underlying member method code with example usage: obj.testReduceScatter() without return types