return Collections.emptySet();
  }

  protected Collection<Method> suppressForConcurrentSkipListSetNatural() {
    return Collections.emptySet();
  }

  protected Collection<Method> suppressForConcurrentSkipListSetWithComparator() {
    return Collections.emptySet();
  }

  public Test testsForEmptySet() {
    return SetTestSuiteBuilder.using(
            new TestStringSetGenerator() {
              @Override

    return Collections.emptySet();
  }

  protected Collection<Method> suppressForConcurrentSkipListSetNatural() {
    return Collections.emptySet();
  }

  protected Collection<Method> suppressForConcurrentSkipListSetWithComparator() {
    return Collections.emptySet();
  }

  public Test testsForCheckedNavigableSet() {
    return SortedSetTestSuiteBuilder.using(
            new TestStringSortedSetGenerator() {