def test_selectors(self): m = FieldFilter(keep=["a","c"]) self.assertListEqual([True, False, True, False], m.field_mask(self.fields)) m = FieldFilter(drop=["b","d"]) self.assertListEqual([True, False, True, False], m.field_mask(self.fields)) m = FieldFilter() self.assertListEqual([True, True, True, True], m.field_mask(self.fields))