def test_encoding_special_character_on_header(self):
subject = "=?UTF-8?Q?test_encoding_St=C3=A4ch?="
email_from = "=?UTF-8?Q?St=C3=A4ch_<*****@*****.**>?="
email_to = "=?utf-8?b?IsOEw7zDtiDDlsO8w6QiIDxmb2xrZXJAcGl4ZWxhdGVkLXByb2plY3Qub3Jn?=\n =?utf-8?b?PiwgRsO2bGtlciA8Zm9sa2VyQHBpeGVsYXRlZC1wcm9qZWN0Lm9yZz4=?="
pixel_mail = PixelatedMail()
self.assertEqual(pixel_mail._decode_header(subject), 'test encoding St\xc3\xa4ch')
self.assertEqual(pixel_mail._decode_header(email_from), 'St\xc3\xa4ch <*****@*****.**>')
self.assertEqual(pixel_mail._decode_header(email_to), '"\xc3\x84\xc3\xbc\xc3\xb6 \xc3\x96\xc3\xbc\xc3\xa4" <*****@*****.**>, F\xc3\xb6lker <*****@*****.**>')
self.assertEqual(pixel_mail._decode_header(None), None)
