is(C4::Koha::_isbn_cleanup('0-590-35340-3'), '0590353403', '_isbn_cleanup removes hyphens');
is(C4::Koha::_isbn_cleanup('0590353403 (pbk.)'), '0590353403', '_isbn_cleanup removes parenthetical');
is(C4::Koha::_isbn_cleanup('0-590-35340-3'), '0590353403', '_isbn_cleanup removes hyphens');
is(C4::Koha::_isbn_cleanup('0590353403 (pbk.)'), '0590353403', '_isbn_cleanup removes parenthetical');