def parse_cookies(self, req, name, field):
        return core.get_value(req.cookies, name, field)
It should pass the right value to get_by_username().
dataset/ETHPy150Open sloria/webargs/webargs/webapp2parser.py/Webapp2Parser.parse_cookies--crossover with--dataset/ETHPy150Open hypothesis/h/h/accounts/test/__init___test.py/test_make_staff_gets_user_by_username