def test_clean_up():
client0 = MagicMock()
client1 = MagicMock()
manager = SessionManager()
manager.add_session("name0", client0)
manager.add_session("name1", client1)
manager.clean_up_all()
client0.delete.assert_called_once_with()
client1.delete.assert_called_once_with()
