def test_usernameReturnedOnSuccess(self):
        d = self.checker.requestAvatarId(self.credentials)
        self.assertEqual(b'alice', self.successResultOf(d))
L{checker.SSHPublicKeyChecker.requestAvatarId}, if successful,
dataset/ETHPy150Open twisted/twisted/twisted/conch/test/test_checkers.py/SSHPublicKeyCheckerTests.test_usernameReturnedOnSuccess