new TestStringSetGenerator() {
              @Override
              public Set<String> create(String[] elements) {
                return new CopyOnWriteArraySet<>(MinimalCollection.of(elements));
              }
            })
        .named("CopyOnWriteArraySet")
        .withFeatures(
            CollectionFeature.SUPPORTS_ADD,
            CollectionFeature.SUPPORTS_REMOVE,
            CollectionFeature.SERIALIZABLE,

      Class<?> eventType = entry.getKey();
      Collection<Subscriber> eventMethodsInListener = entry.getValue();

      CopyOnWriteArraySet<Subscriber> eventSubscribers = subscribers.get(eventType);

      if (eventSubscribers == null) {
        CopyOnWriteArraySet<Subscriber> newSet = new CopyOnWriteArraySet<>();
        eventSubscribers =
            MoreObjects.firstNonNull(subscribers.putIfAbsent(eventType, newSet), newSet);
      }

       */
      /*
       * A CopyOnWriteArraySet<WeakReference> is faster than a newSetFromMap of a MapMaker map with
       * weakKeys() and concurrencyLevel(1), even up to at least 12 cached exception types.
       */
      private static final Set<WeakReference<Class<? extends Exception>>> validClasses =
          new CopyOnWriteArraySet<>();

      @Override

            new TestStringSetGenerator() {
              @Override
              public Set<String> create(String[] elements) {
                return new CopyOnWriteArraySet<>(MinimalCollection.of(elements));
              }
            })
        .named("CopyOnWriteArraySet")
        .withFeatures(
            CollectionFeature.SUPPORTS_ADD,
            CollectionFeature.SUPPORTS_REMOVE,
            CollectionFeature.SERIALIZABLE,

  }

  @J2ktIncompatible
  @GwtIncompatible // CopyOnWriteArraySet
  public void testNewCOWASEmpty() {
    CopyOnWriteArraySet<Integer> set = Sets.newCopyOnWriteArraySet();
    verifySetContents(set, EMPTY_COLLECTION);
  }

  @J2ktIncompatible
  @GwtIncompatible // CopyOnWriteArraySet
  public void testNewCOWASFromIterable() {
    CopyOnWriteArraySet<Integer> set = Sets.newCopyOnWriteArraySet(SOME_ITERABLE);