def test_scrypt(self): backend = MultiBackend([DummyScryptBackend()]) backend.derive_scrypt(b"key", b"salt", 1, 1, 1, 1) backend = MultiBackend([DummyBackend]) with pytest.raises(UnsupportedAlgorithm): backend.derive_scrypt(b"key", b"salt", 1, 1, 1, 1)