'If the passed credentials aren\'t handled by any registered checker,
L{SSHProtocolChecker} should raise L{UnhandledCredentials}.'

def test_requestAvatarIdInvalidCredential(self):

    checker = checkers.SSHProtocolChecker()
    d = checker.requestAvatarId(UsernamePassword('test', 'test'))
    return self.assertFailure(d, UnhandledCredentials)
