code: def testReduce(self):
      import pickle
      import copy
  
      def functions(obj):
          for protocol in range(0, pickle.HIGHEST_PROTOCOL + 1):
              yield lambda ob: pickle.loads(pickle.dumps(ob, protocol))
          yield copy.copy
          yield copy.deepcopy
  
      for obj in self.objects:
          for copier in functions(obj):
              dup = copier(obj)
              self.assertIs(type(dup), type(obj))
              if isinstance(obj, MPI.Status):
                  self.assertIsNot(dup, obj)
              else:
                  self.assertIs(dup, obj)
              cls = type(obj)
              dup = copier(cls(obj))
              self.assertIs(type(dup), cls)
              self.assertIsNot(dup, obj)
              cls = type(f"My{type(obj).__name__}", (type(obj),), {})
              main = __import__("__main__")
              cls.__module__ = main.__name__
              setattr(main, cls.__name__, cls)
              dup = copier(cls(obj))
              delattr(main, cls.__name__)
              self.assertIs(type(dup), cls)
              self.assertIsNot(dup, obj)
  
imports: from mpi4py import MPI
  import mpiunittest
  import ctypes
  import operator
  import weakref
  import sys
label_desc: Use image node_id 5 for calling the TestObjModel obj's underlying member method code with example usage: obj.testReduce() without return types