code: def setUp(self):
      self.COMM = self.CommType(self.COMM)
      self.bigmpi_prev = pkl5._bigmpi
      self.bigmpi = pkl5._BigMPI()
      pkl5._bigmpi = self.bigmpi
  
imports: from mpi4py import MPI
  from mpi4py.util import pkl5
  import sys, os
label_desc: Use image node_id 1 for calling the BaseTest obj's underlying member method code with example usage: obj.setUp() without return types