def test_bool(self):
        prio_set_list = event._PrioritizedSetList()

        assert bool(prio_set_list) is False

        prio_set_list.add(0, None)
        assert bool(prio_set_list) is True
def _init_liststore(self):
        """Creates the liststore"""
        self.liststore = Gtk.ListStore(object, GdkPixbuf.Pixbuf, str, str)
        self.set_model(self.liststore)