CollectionFeature.ALLOWS_NULL_VALUES,
                CollectionFeature.SUPPORTS_ADD)
            .createTestSuite());
    return suite;
  }

  @SuppressWarnings("ModifiedButNotUsed")
  public void testFastAddAllMultiset() {
    AtomicInteger addCalls = new AtomicInteger();
    Multiset<String> multiset =
        new NoRemoveMultiset<String>() {
          @Override