class_docstr: Tests for CopyTo functions of Descriptor.
code: def _InternalTestCopyToProto(
      self, desc, expected_proto_class, expected_proto_ascii
  ):
      actual = expected_proto_class()
      desc.CopyToProto(actual)
      self._AssertProtoEqual(
          actual, expected_proto_class, expected_proto_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 2 for calling the DescriptorCopyToProtoTest obj's underlying member method code with example usage: obj._InternalTestCopyToProto(desc, expected_proto_class, expected_proto_ascii) without return types