code: def testMergeInvalidUtf8(self):
      message = unittest_pb2.TestAllTypes()
      text = 'repeated_string: "\\xc3\\xc3"'
      self.assertRaises(
          text_format.ParseError, text_format.Merge, text, 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 25 for calling the TextFormatTest obj's underlying member method code with example usage: obj.testMergeInvalidUtf8() without return types