code: def testMergeGolden(self):
      golden_text = "\n".join(
          self.ReadGolden("text_format_unittest_data.txt")
      )
      parsed_message = unittest_pb2.TestAllTypes()
      text_format.Merge(golden_text, parsed_message)
  
      message = unittest_pb2.TestAllTypes()
      test_util.SetAllFields(message)
      self.assertEquals(message, parsed_message)
  
imports: import difflib
  import re
  import unittest
  from google.protobuf import text_format
  from google.protobuf.internal import test_util
  from google.protobuf import unittest_pb2
  from google.protobuf import unittest_mset_pb2
label_desc: Use image node_id 18 for calling the TextFormatTest obj's underlying member method code with example usage: obj.testMergeGolden() without return types