def test_is_webextension(self):
        """An add-on with a package.json file can't be a webextension."""
        assert self.parse({}) not in 'is_webextension'
dataset/ETHPy150Open mozilla/addons-server/src/olympia/files/tests/test_utils_.py/TestPackageJSONExtractor.test_is_webextension/swapped operands of `not in`