code: def testNonUniqueProto(self):
      class ClassThatReusesProto(serialization.Serializable):
          @classmethod
          def experimental_type_proto(cls):
              return serialization_test_pb2.MyCustomRepresentation
  
          @classmethod
          def experimental_from_proto(cls, proto):
              raise NotImplementedError
  
          def experimental_as_proto(self):
              raise NotImplementedError
  
      with self.assertRaisesRegex(
          ValueError,
          (
              "Existing Python class MyCustomClass already has "
              "MyCustomRepresentation as its associated proto representation. "
              "Please ensure ClassThatReusesProto has a unique proto representation."
          ),
      ):
          serialization.register_serializable(ClassThatReusesProto)
  
imports: from tensorflow.core.function.trace_type import serialization
  from tensorflow.core.function.trace_type import serialization_test_pb2
  from tensorflow.python.platform import test
label_desc: Use image node_id 5 for calling the SerializeTest obj's underlying member method code with example usage: obj.testNonUniqueProto() and returns: serialization_test_pb2