def check(self, hostname, key):
        for e in self.matching_keys(hostname):
            if e.key.get_name() == key.get_name() and not e.marker:
                if e.key.get_base64() == key.get_base64():
                    return True
        return False
A context manager that sets up the isolation for invoking of a
dataset/ETHPy150Open radssh/radssh/radssh/known_hosts.py/KnownHosts.check--crossover with--dataset/ETHPy150Open pallets/click/click/testing.py/CliRunner.isolation