code: def testPrintNestedMessageAsOneLine(self):
      message = unittest_pb2.TestAllTypes()
      msg = message.repeated_nested_message.add()
      msg.bb = 42
      self.CompareToGoldenText(
          text_format.MessageToString(message, as_one_line=True),
          "repeated_nested_message { bb: 42 }",
      )
  
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 9 for calling the TextFormatTest obj's underlying member method code with example usage: obj.testPrintNestedMessageAsOneLine() without return types