def METHOD_NAME(self, load_system_with_callbacks):
    scwc = load_system_with_callbacks
    mock_rod = self.MockRod(2, 3, 4, 5)
    scwc.append(mock_rod)
    _mock_callback = scwc.collect_diagnostics(mock_rod)
    assert _mock_callback in scwc._callback_list
    assert _mock_callback.__class__ == _CallBack