code: def test_ctor_extra_is_none(self):
      transport = asyncio.Transport()
      self.assertEqual(transport._extra, {})
  
file_path: cpython/Lib/test/test_asyncio/test_transports.py
imports: import unittest
  from unittest import mock
  import asyncio
  from asyncio import transports
label_desc: Use image node_id 1 for calling the TransportTests obj's underlying member method code with example usage: obj.test_ctor_extra_is_none() without return types