def addListener(self, listener, iface=None):
        raise NotImplementedError
Tests the __init__ function.
dataset/ETHPy150Open rwl/muntjac/muntjac/data/property.py/IValueChangeNotifier.addListener--crossover with--dataset/ETHPy150Open ForensicArtifacts/artifacts/tests/source_type_test.py/ArtifactGroupSourceTypeTest.testInitialize