@Override
                  protected SortedMap<String, String> create(Entry<String, String>[] entries) {
                    SafeTreeMap<String, String> map = new SafeTreeMap<>();
                    putEntries(map, entries);
                    return Maps.unmodifiableNavigableMap(map);
                  }
                })
            .named("unmodifiableNavigableMap[SafeTreeMap]")
            .withFeatures(

                  @Override
                  protected SortedMap<String, String> create(Entry<String, String>[] entries) {
                    SafeTreeMap<String, String> map = new SafeTreeMap<>();
                    putEntries(map, entries);
                    return Maps.unmodifiableNavigableMap(map);
                  }
                })
            .named("unmodifiableNavigableMap[SafeTreeMap]")
            .withFeatures(