code: def testCUnescape(self):
      for escaped, escaped_utf8, unescaped in TEST_VALUES:
          self.assertEqual(unescaped, text_encoding.CUnescape(escaped))
          self.assertEqual(
              unescaped, text_encoding.CUnescape(escaped_utf8)
          )
  
imports: from google.protobuf import text_encoding
label_desc: Use image node_id 2 for calling the TextEncodingTestCase obj's underlying member method code with example usage: obj.testCUnescape() without return types