code: def test_parser_propagates_policy_to_message(self):
      msg = self._make_msg()
      self.assertIs(msg.policy, self.policy)
  
imports: import io
  import types
  import textwrap
  import unittest
  import email.errors
  import email.policy
  import email.parser
  import email.generator
  import email.message
  from email import headerregistry
label_desc: Use image node_id 8 for calling the TestPolicyPropagation obj's underlying member method code with example usage: obj.test_parser_propagates_policy_to_message() without return types