return new ArrayList<>(MinimalCollection.of(elements));
              }
            })
        .named("ArrayList")
        .withFeatures(
            ListFeature.GENERAL_PURPOSE,
            CollectionFeature.SERIALIZABLE,
            CollectionFeature.ALLOWS_NULL_VALUES,
            CollectionFeature.FAILS_FAST_ON_CONCURRENT_MODIFICATION,
            CollectionSize.ANY)

 *
 * @author George van den Driessche
 */
@SuppressWarnings("rawtypes") // maybe avoidable if we rework the whole package?
@GwtCompatible
public enum SetFeature implements Feature<Set> {
  GENERAL_PURPOSE(CollectionFeature.GENERAL_PURPOSE);

  private final Set<Feature<? super Set>> implied;

  SetFeature(Feature<? super Set>... implied) {
    this.implied = copyToSet(implied);
  }

  @Override

              CollectionFeature.FAILS_FAST_ON_CONCURRENT_MODIFICATION)
          .put(MapFeature.GENERAL_PURPOSE, ListFeature.SUPPORTS_ADD_WITH_INDEX)
          .put(MapFeature.GENERAL_PURPOSE, ListFeature.SUPPORTS_REMOVE_WITH_INDEX)
          .put(MapFeature.GENERAL_PURPOSE, ListFeature.SUPPORTS_SET)
          .put(MapFeature.ALLOWS_NULL_VALUE_QUERIES, CollectionFeature.ALLOWS_NULL_QUERIES)

                CollectionFeature.SERIALIZABLE,
                MapFeature.ALLOWS_NULL_VALUES,
                CollectionFeature.SUPPORTS_ITERATOR_REMOVE,
                MapFeature.GENERAL_PURPOSE)
            .named("SafeTreeMap with natural comparator")
            .createTestSuite());
    suite.addTest(
        NavigableMapTestSuiteBuilder.using(
                new TestStringSortedMapGenerator() {

    return testers;
  }

  private static Set<Feature<?>> computeEntrySetFeatures(Set<Feature<?>> features) {
    Set<Feature<?>> derivedFeatures = new HashSet<>(features);
    derivedFeatures.remove(CollectionFeature.GENERAL_PURPOSE);
    derivedFeatures.remove(CollectionFeature.SUPPORTS_ADD);
    derivedFeatures.remove(CollectionFeature.ALLOWS_NULL_VALUES);
    derivedFeatures.add(CollectionFeature.REJECTS_DUPLICATES_AT_CREATION);

                  }
                })
            .withFeatures(
                CollectionSize.ANY,
                CollectionFeature.KNOWN_ORDER,
                CollectionFeature.GENERAL_PURPOSE)
            .named("SafeTreeSet with natural comparator")
            .createTestSuite());
    suite.addTest(
        SetTestSuiteBuilder.using(
                new TestStringSetGenerator() {

            .withFeatures(
                CollectionSize.ANY,
                CollectionFeature.KNOWN_ORDER,
                MapFeature.ALLOWS_NULL_VALUES,
                MapFeature.GENERAL_PURPOSE,
                CollectionFeature.SUPPORTS_ITERATOR_REMOVE)
            .createTestSuite());
    suite.addTest(
        SortedMapTestSuiteBuilder.using(
                new TestStringSortedMapGenerator() {

    if (derivedFeatures.contains(CollectionFeature.SUPPORTS_REMOVE)) {
      derivedFeatures.add(ListFeature.SUPPORTS_REMOVE_WITH_INDEX);
    }
    if (derivedFeatures.contains(CollectionFeature.GENERAL_PURPOSE)) {
      derivedFeatures.add(ListFeature.GENERAL_PURPOSE);
    }
    return derivedFeatures;
  }

  private static final class MultimapGetGenerator<K, V>

                    return map;
                  }
                })
            .named("CompactHashMap")
            .withFeatures(
                CollectionSize.ANY,
                MapFeature.GENERAL_PURPOSE,
                MapFeature.ALLOWS_NULL_KEYS,
                MapFeature.ALLOWS_NULL_VALUES,
                CollectionFeature.SERIALIZABLE,
                CollectionFeature.SUPPORTS_ITERATOR_REMOVE)

                  }
                })
            .withFeatures(
                CollectionSize.ANY,
                CollectionFeature.KNOWN_ORDER,
                CollectionFeature.GENERAL_PURPOSE,
                CollectionFeature.SERIALIZABLE,
                CollectionFeature.ALLOWS_NULL_QUERIES,
                MultisetFeature.ENTRIES_ARE_VIEWS)
            .named("TreeMultiset, Ordering.natural")