'Ensure that the __not operator works as expected.'

def test_not(self):

    alice = self.Person(name='Alice', age=25)
    alice.save()
    obj = self.Person.objects(name__iexact='alice').first()
    self.assertEqual(obj, alice)
    obj = self.Person.objects(name__not__iexact='alice').first()
    self.assertEqual(obj, None)
