@CollectionSize.Require(SEVERAL)
  public void testDescendingNavigation() {
    List<E> descending = new ArrayList<>();
    for (Iterator<E> i = navigableSet.descendingIterator(); i.hasNext(); ) {
      descending.add(i.next());
    }
    Collections.reverse(descending);
    assertEquals(values, descending);
  }

  public void testEmptySubSet() {
    NavigableSet<E> empty = navigableSet.subSet(e0(), false, e0(), false);

      Iterator<Entry<K, Collection<V>>> asMapItr = multimap().asMap().entrySet().iterator();
      Collection<V> collection = null;
      while (asMapItr.hasNext()) {
        Entry<K, Collection<V>> asMapEntry = asMapItr.next();
        if (key.equals(asMapEntry.getKey())) {
          collection = asMapEntry.getValue();
          break;
        }
      }
      assertNotNull(collection);

        ConcurrentModificationException.class,
        () -> {
          Iterator<E> iterator = collection.iterator();
          assertTrue(collection.addAll(MinimalCollection.of(e3(), e0())));
          iterator.next();
        });
  }

  @CollectionFeature.Require(absent = SUPPORTS_ADD)
  @CollectionSize.Require(absent = ZERO)
  public void testAddAll_unsupportedAllPresent() {
    try {
      assertFalse(

        Iterator<V> valueItr = valueIterators.get(key);
        if (valueItr == null) {
          valueIterators.put(key, valueItr = sampleValuesIterator());
        }
        entries[i] = mapEntry(key, valueItr.next());
      }
      return multimapGenerator.create((Object[]) entries).keys();
    }

    private Iterator<V> sampleValuesIterator() {

  }

  private static final DiscreteDomain<Integer> UNBOUNDED_DOMAIN =
      new DiscreteDomain<Integer>() {
        @Override
        public Integer next(Integer value) {
          return integers().next(value);
        }

        @Override
        public Integer previous(Integer value) {
          return integers().previous(value);
        }

        @Override

				bucket := buckets[i].Name
				updated := false

				meta, err := loadBucketMetadata(ctx, sys.objAPI, bucket)
				if err != nil {
					internalLogIf(ctx, err, logger.WarningKind)
					wait() // wait to proceed to next entry.
					continue
				}

				sys.Lock()
				// Update if the bucket metadata in the memory is older than on-disk one
				if lu := sys.metadataMap[bucket].lastUpdate(); lu.Before(meta.lastUpdate()) {

				return
			}
			var next []byte
			next, remain, err = msgp.ReadBytesZC(remain)
			if err != nil {
				if !xnet.IsNetworkOrHostDown(err, true) {
					gridLogIf(ctx, fmt.Errorf("ws read merged: %w", err))
				}
				return
			}

			m.Payload = nil
			subID, _, err = m.parse(next)
			if err != nil {
				if !xnet.IsNetworkOrHostDown(err, true) {

    Set<E> edgesConnecting = edgesConnecting(nodeU, nodeV);
    switch (edgesConnecting.size()) {
      case 0:
        return null;
      case 1:
        return edgesConnecting.iterator().next();
      default:
        throw new IllegalArgumentException(String.format(MULTIPLE_EDGES_CONNECTING, nodeU, nodeV));
    }
  }

  @Override
  public @Nullable E edgeConnectingOrNull(EndpointPair<N> endpoints) {

    if (e is ProtocolException) {
      return false
    }

    // If there was an interruption don't recover, but if there was a timeout connecting to a route
    // we should try the next route (if there is one).
    if (e is InterruptedIOException) {
      return e is SocketTimeoutException && !requestSendStarted
    }

          )
        }

        val callsToExecute = mutableListOf<AsyncCall>()
        val i = readyAsyncCalls.iterator()
        while (i.hasNext()) {
          val asyncCall = i.next()

          if (runningAsyncCalls.size >= this.maxRequests) break // Max capacity.
          if (asyncCall.callsPerHost.get() >= this.maxRequestsPerHost) continue // Host max capacity.

          i.remove()