code: def test_fold_zero_max_line_length(self):
      expected = "Subject: =?utf-8?q?=C3=A1?=\n"
  
      msg = email.message.EmailMessage()
      msg["Subject"] = "á"
  
      p1 = email.policy.default.clone(max_line_length=0)
      p2 = email.policy.default.clone(max_line_length=None)
  
      self.assertEqual(p1.fold("Subject", msg["Subject"]), expected)
      self.assertEqual(p2.fold("Subject", msg["Subject"]), expected)
  
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 PolicyAPITests obj's underlying member method code with example usage: obj.test_fold_zero_max_line_length() without return types