code: def testIsPredefined(self):
      self.assertTrue(MPI.OP_NULL.is_predefined)
      ops = [
          MPI.MAX,
          MPI.MIN,
          MPI.SUM,
          MPI.PROD,
          MPI.LAND,
          MPI.BAND,
          MPI.LOR,
          MPI.BOR,
          MPI.LXOR,
          MPI.BXOR,
          MPI.MAXLOC,
          MPI.MINLOC,
      ]
      for op in ops:
          self.assertTrue(op.is_predefined)
  
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 10 for calling the TestOp obj's underlying member method code with example usage: obj.testIsPredefined() without return types