def tearDown(self):
        self.user.subscriptions.all().delete()
        self.user.delete()
        self.group.delete()
:see Expression._set_type()
dataset/ETHPy150Open ofa/connect/open_connect/notifications/tests/test_views.py/SubscriptionUpdateViewTest.tearDown--crossover with--dataset/ETHPy150Open nltk/nltk/nltk/sem/logic.py/NegatedExpression._set_type