''

def test_column_deleting_works_properly(self):

    tm = TestModel.create(count=8, text='123456789')
    tm.text = None
    tm.save()
    tm2 = TestModel.objects(id=tm.pk).first()
    self.assertIsInstance(tm2, TestModel)
    self.assertTrue((tm2.text is None))
    self.assertTrue((tm2._values['text'].previous_value is None))
