def METHOD_NAME(self) -> None:
    duplicate_names = []
    for feature in self.all_features_set:
        if self.all_features_list.count(feature) > 1:
            duplicate_names.append(feature.value)
    self.assertTrue(
        len(duplicate_names) == 0,
        msg='Following entries appear more than once in features lists'
        ': %s.' % (duplicate_names)
    )