* objects in any other equivalence group added to this tester.
   */
  @CanIgnoreReturnValue
  public EquivalenceTester<T> addEquivalenceGroup(T first, T... rest) {
    addEquivalenceGroup(Lists.asList(first, rest));
    return this;
  }

  @CanIgnoreReturnValue
  public EquivalenceTester<T> addEquivalenceGroup(Iterable<T> group) {
    delegate.addRelatedGroup(group);
    items.addAll(ImmutableList.copyOf(group));

    return (int) (cumulativeCounts[offset + index + 1] - cumulativeCounts[offset + index]);
  }

  @Override
  Entry<E> getEntry(int index) {
    return Multisets.immutableEntry(elementSet.asList().get(index), getCount(index));
  }

  @Override
  public @Nullable Entry<E> firstEntry() {
    return isEmpty() ? null : getEntry(0);
  }

  @Override
  public @Nullable Entry<E> lastEntry() {

  private static final Ordering<@Nullable Integer> ORDERING =
      Ordering.<Integer>natural().<Integer>nullsFirst();

  private static final List<@Nullable Integer> IN_ORDER_VALUES =
      unmodifiableList(Arrays.<@Nullable Integer>asList(null, 1, 2, 3, 4, 5));

  public void testCreateEmptyRangeFails() {
    for (BoundType lboundType : BoundType.values()) {
      for (BoundType uboundType : BoundType.values()) {

                    // Put the sets in different orders for the hell of it
                    return union(
                        new LinkedHashSet<>(asList(elements[0], elements[1], elements[2])),
                        new LinkedHashSet<>(asList(elements[1], elements[0], elements[2])));
                  }
                })
            .named("set U itself")

     * List, which is _even more likely_ to have size() implemented to be fast and side-effect-free.
     *
     * We could consider recognizing specific other collections as safe (like ImmutableCollection,
     * except ContiguousSet!) or as not worth this optimization (CopyOnWriteArrayList?).
     */
    if (parts instanceof List) {
      int size = ((List<?>) parts).size();
      if (size == 0) {

    // TODO(kevinb): Support a concurrently modified collection?
    Iterable<E> iterable = getDelegate();
    if (iterable instanceof List) {
      List<E> list = (List<E>) iterable;
      if (list.isEmpty()) {
        return Optional.absent();
      }
      return Optional.of(list.get(list.size() - 1));
    }
    Iterator<E> iterator = iterable.iterator();
    if (!iterator.hasNext()) {
      return Optional.absent();

    // TODO(kevinb): Support a concurrently modified collection?
    Iterable<E> iterable = getDelegate();
    if (iterable instanceof List) {
      List<E> list = (List<E>) iterable;
      if (list.isEmpty()) {
        return Optional.absent();
      }
      return Optional.of(list.get(list.size() - 1));
    }
    Iterator<E> iterator = iterable.iterator();
    if (!iterator.hasNext()) {
      return Optional.absent();

     * @return the parsed array as a list
     * @throws IOException if an I/O error occurs
     */
    protected Object parseArray(final JsonParser jsonParser) throws IOException {
        final List<Object> list = new ArrayList<>();
        while (jsonParser.nextToken() != JsonToken.END_ARRAY) {
            if (jsonParser.getCurrentToken() == JsonToken.START_OBJECT) {
                list.add(parseObject(jsonParser));

import static java.lang.Math.max;
import static java.util.Arrays.asList;
import static java.util.Arrays.sort;
import static java.util.Collections.unmodifiableList;

import com.google.common.annotations.GwtCompatible;
import com.google.common.math.IntMath;
import java.math.RoundingMode;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.stream.Stream;

        repository.setUrl("file://" + repoDir.toURI().getPath());
        repository.setReleases(policy);
        repository.setSnapshots(policy);

        return Arrays.asList(repositorySystem.buildArtifactRepository(repository));
    }

    protected ArtifactRepository getLocalRepository() throws Exception {
        File repoDir = new File(getBasedir(), "target/local-repo").getAbsoluteFile();