code: def msg_as_deepcopy(self, msg):
      msg2 = copy.deepcopy(msg)
      self.assertEqual(msg2.as_string(), msg.as_string())
  
file_path: cpython/Lib/test/test_email/test_pickleable.py
imports: import unittest
  import textwrap
  import copy
  import pickle
  import email
  import email.message
  from email import policy
  from email.headerregistry import HeaderRegistry
  from test.test_email import TestEmailBase, parameterize
label_desc: Use image node_id 1 for calling the TestPickleCopyMessage obj's underlying member method code with example usage: obj.msg_as_deepcopy(msg) without return types