def test_non_ascii_chars_do_not_cause_inf_loop(self):
policy = email.policy.default.clone(max_line_length=20)
actual = policy.fold('Subject', 'ą' * 12)
self.assertEqual(
actual,
'Subject: \n' +
12 * ' =?utf-8?q?=C4=85?=\n')
def test_short_maxlen_error(self):
# RFC 2047 chrome takes up 7 characters, plus the length of the charset
# name, so folding should fail if maxlen is lower than the minimum
# required length for a line.
# Note: This is only triggered when there is a single word longer than
# max_line_length, hence the 1234567890 at the end of this whimsical
# subject. This is because when we encounter a word longer than
# max_line_length, it is broken down into encoded words to fit
# max_line_length. If the max_line_length isn't large enough to even
# contain the RFC 2047 chrome (`?=<charset>?q??=`), we fail.
subject = "Melt away the pounds with this one simple trick! 1234567890"
for maxlen in [3, 7, 9]:
with self.subTest(maxlen=maxlen):
policy = email.policy.default.clone(max_line_length=maxlen)
with self.assertRaises(email.errors.HeaderParseError):
policy.fold("Subject", subject)