}

  @MapFeature.Require(SUPPORTS_REMOVE)
  @CollectionSize.Require(absent = ZERO)
  public void testRemovePropagatesToGet() {
    List<Entry<K, V>> entries = Helpers.copyToList(multimap().entries());
    for (Entry<K, V> entry : entries) {
      resetContainer();

      K key = entry.getKey();
      V value = entry.getValue();
      Collection<V> collection = multimap().get(key);

                new TestStringMapGenerator() {
                  @Override
                  protected Map<String, String> create(Entry<String, String>[] entries) {
                    Map<String, String> map = CompactLinkedHashMap.create();
                    for (Entry<String, String> entry : entries) {
                      map.put(entry.getKey(), entry.getValue());
                    }
                    return map;
                  }

      if (entries instanceof Collection) {
        ensureCapacity(size + ((Collection<?>) entries).size());
      }
      for (Entry<? extends K, ? extends V> entry : entries) {
        put(entry);
      }
      return this;
    }

    /**
     * Configures this {@code Builder} to order entries by value according to the specified
     * comparator.

  }

  private final transient ImmutableList<Entry<K, V>> entries;
  private final Map<K, V> forwardDelegate;
  private final Map<V, K> backwardDelegate;

  private JdkBackedImmutableBiMap(
      ImmutableList<Entry<K, V>> entries, Map<K, V> forwardDelegate, Map<V, K> backwardDelegate) {
    this.entries = entries;
    this.forwardDelegate = forwardDelegate;
    this.backwardDelegate = backwardDelegate;
  }

  @LazyInit @CheckForNull private transient Collection<Entry<K, V>> entries;

  @Override
  public Collection<Entry<K, V>> entries() {
    Collection<Entry<K, V>> result = entries;
    return (result == null) ? entries = createEntries() : result;
  }

  abstract Collection<Entry<K, V>> createEntries();

  @WeakOuter
  class Entries extends Multimaps.Entries<K, V> {
    @Override
    Multimap<K, V> multimap() {

  @LazyInit @CheckForNull private transient Collection<Entry<K, V>> entries;

  @Override
  public Collection<Entry<K, V>> entries() {
    Collection<Entry<K, V>> result = entries;
    return (result == null) ? entries = createEntries() : result;
  }

  abstract Collection<Entry<K, V>> createEntries();

  @WeakOuter
  class Entries extends Multimaps.Entries<K, V> {
    @Override
    Multimap<K, V> multimap() {

            + " even if some keys are null.",
        getMap().equals(newHashMap(entries)));
  }

  @CollectionSize.Require(absent = CollectionSize.ZERO)
  public void testEquals_otherContainsNullKey() {
    Collection<Entry<K, V>> entries = getSampleEntries(getNumEntries() - 1);
    entries.add(entry(null, v3()));
    Map<K, V> other = newHashMap(entries);

    assertFalse(

            + " even if some keys are null.",
        getMap().equals(newHashMap(entries)));
  }

  @CollectionSize.Require(absent = CollectionSize.ZERO)
  public void testEquals_otherContainsNullKey() {
    Collection<Entry<K, V>> entries = getSampleEntries(getNumEntries() - 1);
    entries.add(entry(null, v3()));
    Map<K, V> other = newHashMap(entries);

    assertFalse(

  }

  @MapFeature.Require(SUPPORTS_PUT)
  public void testPutNotPresentKeyPropagatesToEntries() {
    Collection<Entry<K, V>> entries = multimap().entries();
    assertFalse(entries.contains(Helpers.mapEntry(k3(), v3())));
    multimap().put(k3(), v3());
    assertContains(entries, Helpers.mapEntry(k3(), v3()));
  }

  @CollectionSize.Require(absent = ZERO)
  @MapFeature.Require(SUPPORTS_PUT)

  public static class ImmutableBiMapGenerator extends TestStringBiMapGenerator {
    @Override
    protected BiMap<String, String> create(Entry<String, String>[] entries) {
      ImmutableBiMap.Builder<String, String> builder = ImmutableBiMap.builder();
      for (Entry<String, String> entry : entries) {
        builder.put(entry.getKey(), entry.getValue());
      }
      return builder.build();
    }
  }