def METHOD_NAME(self):
    self.assertEqual(parse_datetime(None), None)
    self.assertEqual(
        parse_datetime('2016-11-28T23:57:30.090459+01:00'),
        datetime_parser.parse('2016-11-28T23:57:30.090459+01:00'))
    self.assertEqual(
        parse_datetime('2016-11-28T23%3A57%3A30.090459%2B01%3A00'),
        datetime_parser.parse('2016-11-28T23:57:30.090459+01:00'))