def METHOD_NAME(self) -> None:
    feature_flags = feature_services.get_all_feature_flag_dicts()
    self.assertGreater(len(feature_flags), 0)
    for feature in feature_flags:
        self.assertEqual(
            feature['data_type'],
            'bool',
            'We expect all the feature-flags to be of type boolean '
            'but "%s" feature-flag is of type "%s".' % (
                feature['name'], feature['data_type'])
        )