code: def ReadGolden(self, golden_filename):
      f = test_util.GoldenFile(golden_filename)
      golden_lines = f.readlines()
      f.close()
      return golden_lines
  
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 1 for calling the TextFormatTest obj's underlying member method code with example usage: obj.ReadGolden(golden_filename) and returns: golden_lines