def METHOD_NAME(self):
    headers = {
        'From': 'foo@example.com',
        'To': 'bar@example.com',
        'Subject': 'Test email héhé',
    }
    e = envelope.Envelope(account=test_account,
                          headers={k: [v] for k, v in headers.items()},
                          bodytext='Test')
    mail = e.construct_mail()
    raw = mail.as_string(policy=email.policy.SMTP, maxheaderlen=sys.maxsize)
    actual = email.parser.Parser().parsestr(raw)
    self.assertEqual('Test email =?utf-8?b?aMOpaMOp?=', actual['Subject'])