code: def testBcast(self):
      for smess in messages:
          for root in range(self.COMM.Get_size()):
              rmess = self.COMM.bcast(smess, root=root)
              self.assertEqual(smess, rmess)
  
imports: from mpi4py import MPI
  import mpiunittest
  from functools import reduce
label_desc: Use image node_id 2 for calling the BaseTestCCOObj obj's underlying member method code with example usage: obj.testBcast() without return types