suite.addTest(testsForConcurrentSkipListMapNatural());
    suite.addTest(testsForConcurrentSkipListMapWithComparator());
    return suite;
  }

  protected Collection<Method> suppressForCheckedMap() {
    return emptySet();
  }

  protected Collection<Method> suppressForCheckedSortedMap() {
    return emptySet();
  }

  protected Collection<Method> suppressForEmptyMap() {
    return emptySet();