'\'attachment\', specifying a filename in both formats.
foo-ae.html in the traditional format, and foo-Ã€.html in RFC2231
format.
Section 4.2 of RFC 5987 and Section 4.3 of RFC 6266 suggest that the
RFC 2231/5987 encoded parameter ("filename*") should take precedence
when understood.'

def test_attfnboth2(self, header_checker):

    header_checker.check_filename('attachment;    filename*=UTF-8\'\'foo-%c3%a4.html;    filename="foo-ae.html"', 'foo-\xc3\xa4.html')
