code: def testEmpty(self):
      self.assertEqual("", "")
  
imports: import copy
  import re
  import sys
  import textwrap
  from google.protobuf import text_format
  from tensorflow.python.platform import googletest
  from tensorflow.python.util.protobuf import compare
  from tensorflow.python.util.protobuf import compare_test_pb2
label_desc: Use image node_id 4 for calling the ProtoEqTest obj's underlying member method code with example usage: obj.testEmpty() without return types