class_docstr: Tests for CopyTo functions of Descriptor.
code: def testCopyToProto_EmptyMessage(self):
      self._InternalTestCopyToProto(
          unittest_pb2.TestEmptyMessage.DESCRIPTOR,
          descriptor_pb2.DescriptorProto,
          TEST_EMPTY_MESSAGE_DESCRIPTOR_ASCII,
      )
  
imports: import sys
  from google.protobuf import unittest_custom_options_pb2
  from google.protobuf import unittest_import_pb2
  from google.protobuf import unittest_pb2
  from google.protobuf import descriptor_pb2
  from google.protobuf.internal import api_implementation
  from google.protobuf.internal import test_util
  from google.protobuf import descriptor
  from google.protobuf import descriptor_pool
  from google.protobuf import symbol_database
  from google.protobuf import text_format
label_desc: Use image node_id 3 for calling the DescriptorCopyToProtoTest obj's underlying member method code with example usage: obj.testCopyToProto_EmptyMessage() without return types