def test_non_containment(self):
    view = PropertyDictView({'A': 1, 'B': 2, 'C': 3})
    self.assertNotIn('D', view)
def test_non_containment(self):
    view = PropertyDictView({'A': 1, 'B': 2, 'C': 3})
    self.assertNotIn('D', view)