docstr: Test that the DescriptorPool is used.
code: def testMakeSameProtoClassTwice(self):
      """Test that the DescriptorPool is used."""
      pool = descriptor_pool.DescriptorPool()
      proto_cls1 = proto_builder.MakeSimpleProtoClass(
          self._fields,
          full_name="net.proto2.python.public.proto_builder_test.Test",
          pool=pool,
      )
      proto_cls2 = proto_builder.MakeSimpleProtoClass(
          self._fields,
          full_name="net.proto2.python.public.proto_builder_test.Test",
          pool=pool,
      )
      self.assertIs(proto_cls1.DESCRIPTOR, proto_cls2.DESCRIPTOR)
  
file_path: turicreate/src/external/coremltools_wrap/coremltools/deps/protobuf/python/google/protobuf/internal/proto_builder_test.py
imports: from google.protobuf import descriptor_pb2
  from google.protobuf import descriptor_pool
  from google.protobuf import proto_builder
  from google.protobuf import text_format
label_desc: Use image node_id 4 for calling the ProtoBuilderTest obj's underlying member method code with example usage: obj.testMakeSameProtoClassTwice() without return types