protected Map<K, V> makeEitherMap() {
    try {
      return makePopulatedMap();
    } catch (UnsupportedOperationException e) {
      return makeEmptyMap();
    }
  }

  protected final boolean supportsValuesHashCode(Map<K, V> map) {
    // get the first non-null value
    Collection<V> values = map.values();
    for (V value : values) {
      if (value != null) {
        try {
          int unused = value.hashCode();

      assertContentsInOrder(list, "a", "b", "c", "d");
      throw new Error();
    } catch (AssertionFailedError expected) {
    }

    try {
      assertContentsInOrder(list, "a", "c", "b");
      throw new Error();
    } catch (AssertionFailedError expected) {
    }

    try {
      assertContentsInOrder(list, "a", "B", "c");
      throw new Error();
    } catch (AssertionFailedError expected) {
    }

      assertContentsInOrder(list, "a", "b", "c", "d");
      throw new Error();
    } catch (AssertionFailedError expected) {
    }

    try {
      assertContentsInOrder(list, "a", "c", "b");
      throw new Error();
    } catch (AssertionFailedError expected) {
    }

    try {
      assertContentsInOrder(list, "a", "B", "c");
      throw new Error();
    } catch (AssertionFailedError expected) {
    }

  protected Map<K, V> makeEitherMap() {
    try {
      return makePopulatedMap();
    } catch (UnsupportedOperationException e) {
      return makeEmptyMap();
    }
  }

  protected final boolean supportsValuesHashCode(Map<K, V> map) {
    // get the first non-null value
    Collection<V> values = map.values();
    for (V value : values) {
      if (value != null) {
        try {
          int unused = value.hashCode();

    Collection<E> copy = new ArrayList<>();
    copy.addAll(collection);

    try {
      collection.add(sampleElement);
      fail("add succeeded on unmodifiable collection");
    } catch (UnsupportedOperationException expected) {
    }

    assertCollectionsAreEquivalent(copy, collection);

    try {
      collection.addAll(siblingCollection);
      fail("addAll succeeded on unmodifiable collection");

  @J2ktIncompatible
  @GwtIncompatible // concurrency
  public static void awaitUninterruptibly(CountDownLatch latch) {
    boolean interrupted = false;
    try {
      while (true) {
        try {
          latch.await();
          return;
        } catch (InterruptedException e) {
          interrupted = true;
        }
      }
    } finally {
      if (interrupted) {

    }

    @Override
    public synchronized void insert(final ProtwordsItem item) {
        try (ProtwordsUpdater updater = new ProtwordsUpdater(item)) {
            reload(updater);
        }
    }

    @Override
    public synchronized void update(final ProtwordsItem item) {
        try (ProtwordsUpdater updater = new ProtwordsUpdater(item)) {
            reload(updater);
        }
    }

    }

    @Override
    public synchronized void insert(final StopwordsItem item) {
        try (SynonymUpdater updater = new SynonymUpdater(item)) {
            reload(updater);
        }
    }

    @Override
    public synchronized void update(final StopwordsItem item) {
        try (SynonymUpdater updater = new SynonymUpdater(item)) {
            reload(updater);
        }
    }

    Collection<E> copy = new ArrayList<>();
    copy.addAll(collection);

    try {
      collection.add(sampleElement);
      fail("add succeeded on unmodifiable collection");
    } catch (UnsupportedOperationException expected) {
    }

    assertCollectionsAreEquivalent(copy, collection);

    try {
      collection.addAll(siblingCollection);
      fail("addAll succeeded on unmodifiable collection");

    }

    @Override
    public synchronized void insert(final StemmerOverrideItem item) {
        try (StemmerOverrideUpdater updater = new StemmerOverrideUpdater(item)) {
            reload(updater);
        }
    }

    @Override
    public synchronized void update(final StemmerOverrideItem item) {
        try (StemmerOverrideUpdater updater = new StemmerOverrideUpdater(item)) {
            reload(updater);
        }