def METHOD_NAME(self):
    class NWBConverterChild(NWBConverter):
        data_interface_classes = dict(InterfaceA=self.InterfaceA, InterfaceB=self.InterfaceB)
    source_data = dict(InterfaceA=dict(), InterfaceB=dict())
    converter = NWBConverterChild(source_data)
    data_interface_names = converter.data_interface_classes.keys()
    assert ["InterfaceA", "InterfaceB"] == list(data_interface_names)
    assert converter.data_interface_classes["InterfaceA"] is self.InterfaceA
    assert converter.data_interface_classes["InterfaceB"] is self.InterfaceB