'\'attachment\', specifying a filename of foo-Ã€.html.
Using RFC2231 encoded UTF-8, but a single quote is missing.
The parameter is invalid, thus should be ignored.'

def test_attwithfn2231singleqmissing(self, header_checker):

    header_checker.check_ignored("attachment;    filename*=UTF-8'foo-%c3%a4.html")
