cpython/Lib/test/test_email/test_message.py

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import unittest
from email import policy
from test.test_email import TestEmailBase
class Test(TestEmailBase):
policy = policy.default
def test_error_on_setitem_if_max_count_exceeded(self):
m = self._str_msg("")
m['To'] = 'abc@xyz'
with self.assertRaises(ValueError):
m['To'] = 'xyz@abc'
if __name__ == '__main__':
unittest.main()