new TestStringSortedSetGenerator() {
              @Override
              public SortedSet<String> create(String[] elements) {
                return new TreeSet<>(MinimalCollection.of(elements));
              }
            })
        .named("TreeSet, natural")
        .withFeatures(
            SetFeature.GENERAL_PURPOSE,
            CollectionFeature.SERIALIZABLE,
            CollectionFeature.KNOWN_ORDER,

                NavigableSet<String> innerSet = new TreeSet<>();
                Collections.addAll(innerSet, elements);
                return Collections.checkedNavigableSet(innerSet, String.class);
              }
            })
        .named("checkedNavigableSet/TreeSet, natural")
        .withFeatures(
            SetFeature.GENERAL_PURPOSE,