String oneSizeName =
          Platform.format(
              "%s [collection size: %s]", name, collectionSize.toString().toLowerCase());
      OneSizeGenerator<T, E> oneSizeGenerator =
          new OneSizeGenerator<>(getSubjectGenerator(), (CollectionSize) collectionSize);
      Set<Feature<?>> oneSizeFeatures = copyToSet(features);
      oneSizeFeatures.add(collectionSize);