protected Set<String> create(String[] elements) {
                    return Sets.newConcurrentHashSet(Arrays.asList(elements));
                  }
                })
            .named("Sets.newConcurrentHashSet")
            .withFeatures(CollectionSize.ANY, SetFeature.GENERAL_PURPOSE)
            .createTestSuite());

    suite.addTest(
        SetTestSuiteBuilder.using(

                MapFeature.REJECTS_DUPLICATES_AT_CREATION,
                MapFeature.ALLOWS_ANY_NULL_QUERIES)
            .named("ImmutableSortedMap.copyOf[Iterable<Entry>]")
            .createTestSuite());

    suite.addTest(
        ListTestSuiteBuilder.using(new ImmutableSortedMapEntryListGenerator())
            .named("ImmutableSortedMap.entrySet.asList")
            .withFeatures(
                CollectionSize.ANY,

            new TestStringSetGenerator() {
              @Override
              public Set<String> create(String[] elements) {
                return Collections.emptySet();
              }
            })
        .named("emptySet")
        .withFeatures(CollectionFeature.SERIALIZABLE, CollectionSize.ZERO)
        .suppressing(suppressForEmptySet())
        .createTestSuite();
  }

  public Test testsForSingletonSet() {

                Map<String, String> map = populate(new HashMap<String, String>(), entries);
                return Collections.checkedMap(map, String.class, String.class);
              }
            })
        .named("checkedMap/HashMap")
        .withFeatures(
            MapFeature.GENERAL_PURPOSE,
            MapFeature.ALLOWS_NULL_KEYS,
            MapFeature.ALLOWS_NULL_VALUES,
            MapFeature.ALLOWS_ANY_NULL_QUERIES,

                  }
                })
            .named("Lists.reverse[ImmutableList]")
            .withFeatures(CollectionSize.ANY, CollectionFeature.ALLOWS_NULL_QUERIES)
            .createTestSuite());

    suite.addTest(
        ListTestSuiteBuilder.using(new CharactersOfStringGenerator())
            .named("Lists.charactersOf[String]")
            .withFeatures(

                            .result();
                      }
                    }.sortedCopy(insertionOrder);
                  }
                })
            .named("TreeMultimap nullsFirst")
            .withFeatures(
                MapFeature.ALLOWS_NULL_KEYS,
                MapFeature.ALLOWS_NULL_VALUES,
                MapFeature.ALLOWS_ANY_NULL_QUERIES,

                            .result();
                      }
                    }.sortedCopy(insertionOrder);
                  }
                })
            .named("TreeMultimap nullsFirst")
            .withFeatures(
                MapFeature.ALLOWS_NULL_KEYS,
                MapFeature.ALLOWS_NULL_VALUES,
                MapFeature.ALLOWS_ANY_NULL_QUERIES,

            .named("ImmutableListMultimap")
            .withFeatures(ALLOWS_ANY_NULL_QUERIES, SERIALIZABLE, KNOWN_ORDER, CollectionSize.ANY)
            .createTestSuite());
    suite.addTest(
        ListMultimapTestSuiteBuilder.using(new ImmutableListMultimapCopyOfEntriesGenerator())
            .named("ImmutableListMultimap.copyOf[Iterable<Entry>]")

            .named("ImmutableSetMultimap")
            .withFeatures(ALLOWS_ANY_NULL_QUERIES, KNOWN_ORDER, SERIALIZABLE, CollectionSize.ANY)
            .createTestSuite());
    suite.addTest(
        SetMultimapTestSuiteBuilder.using(new ImmutableSetMultimapCopyOfEntriesGenerator())
            .named("ImmutableSetMultimap.copyOf[Iterable<Entry>]")

                CollectionFeature.GENERAL_PURPOSE,
                CollectionFeature.SERIALIZABLE,
                CollectionFeature.ALLOWS_NULL_QUERIES,
                MultisetFeature.ENTRIES_ARE_VIEWS)
            .named("TreeMultiset, Ordering.natural")
            .createTestSuite());
    suite.addTest(
        SortedMultisetTestSuiteBuilder.using(
                new TestStringMultisetGenerator() {
                  @Override