code: def testSplit(self):
      base = self.COMM
      comm = base.Split(42, 42)
      self.assertEqual(comm.Get_rank(), base.Get_rank())
      self.assertEqual(comm.Get_size(), base.Get_size())
      comm.Free()
      color = base.Get_rank()
      comm = base.Split(color, 42)
      self.assertEqual(comm.Get_rank(), 0)
      self.assertEqual(comm.Get_size(), 1)
      comm.Free()
  
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 17 for calling the BaseTestComm obj's underlying member method code with example usage: obj.testSplit() without return types