code: def test_abc(self):
      with self.assertRaises(TypeError) as cm:
          email.policy.Policy()
      msg = str(cm.exception)
      abstract_methods = (
          "fold",
          "fold_binary",
          "header_fetch_parse",
          "header_source_parse",
          "header_store_parse",
      )
      for method in abstract_methods:
          self.assertIn(method, msg)
  
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 3 for calling the PolicyAPITests obj's underlying member method code with example usage: obj.test_abc() without return types