assertEquals(2, keys.count(k0()));
    assertEquals(1, keys.count(k1()));
    assertEquals(3, keys.size());
    assertContainsAllOf(keys, k0(), k1());
    assertContainsAllOf(
        keys.entrySet(), Multisets.immutableEntry(k0(), 2), Multisets.immutableEntry(k1(), 1));
  }

  @MapFeature.Require(ALLOWS_NULL_KEY_QUERIES)
  public void testKeysCountAbsentNullKey() {
    assertEquals(0, multimap().keys().count(null));

    Set<Entry<K, V>> entrySet = getMap().entrySet();
    Iterator<Entry<K, V>> entryItr = entrySet.iterator();
    assertEquals(e0(), entryItr.next());
    entryItr.remove();
    assertTrue(getMap().isEmpty());
    assertFalse(entrySet.contains(e0()));
  }

  public void testContainsEntryWithIncomparableKey() {
    try {
      assertFalse(getMap().entrySet().contains(mapEntry(IncomparableType.INSTANCE, v0())));

    Set<Entry<K, V>> entrySet = getMap().entrySet();
    Iterator<Entry<K, V>> entryItr = entrySet.iterator();
    assertEquals(e0(), entryItr.next());
    entryItr.remove();
    assertTrue(getMap().isEmpty());
    assertFalse(entrySet.contains(e0()));
  }

  public void testContainsEntryWithIncomparableKey() {
    try {
      assertFalse(getMap().entrySet().contains(mapEntry(IncomparableType.INSTANCE, v0())));

  @LazyInit @CheckForNull private transient Set<Entry<E>> entrySet;

  @Override
  public Set<Entry<E>> entrySet() {
    Set<Entry<E>> result = entrySet;
    if (result == null) {
      entrySet = result = createEntrySet();
    }
    return result;
  }

  @WeakOuter
  class EntrySet extends Multisets.EntrySet<E> {
    @Override
    Multiset<E> multiset() {

  abstract Iterator<Entry<E>> entryIterator();

  @Nullable private transient Set<Entry<E>> entrySet;

  @Override
  public Set<Entry<E>> entrySet() {
    Set<Entry<E>> result = entrySet;
    return (result == null) ? entrySet = createEntrySet() : result;
  }

  Set<Entry<E>> createEntrySet() {
    return new Multisets.EntrySet<E>() {
      @Override
      Multiset<E> multiset() {

  @LazyInit @CheckForNull private transient Set<Entry<E>> entrySet;

  @Override
  public Set<Entry<E>> entrySet() {
    Set<Entry<E>> result = entrySet;
    return (result == null) ? entrySet = createEntrySet() : result;
  }

  Set<Entry<E>> createEntrySet() {
    @WeakOuter
    class EntrySetImpl extends Multisets.EntrySet<E> {
      @Override
      Multiset<E> multiset() {

  }

  public void testEntrySet() {
    Map<String, Integer> map = create();
    Set<Entry<String, Integer>> entrySet = map.entrySet();
    assertTrue(entrySet instanceof SynchronizedSet);
    assertSame(mutex, ((SynchronizedSet<?>) entrySet).mutex);
  }

  public void testEquals() {
    boolean unused = create().equals(new HashMap<String, Integer>());
  }

  public void testEntrySetMutationThrows() {
    map.putInstance(String.class, "test");
    assertEquals(TypeToken.of(String.class), map.entrySet().iterator().next().getKey());
    assertEquals("test", map.entrySet().iterator().next().getValue());
    assertThrows(
        UnsupportedOperationException.class, () -> map.entrySet().iterator().next().setValue(1));
  }

  public void testEntrySetToArrayMutationThrows() {

        final HttpServletRequest req = (HttpServletRequest) request;
        final String servletPath = req.getServletPath();
        for (final Map.Entry<String, String> entry : encodingMap.entrySet()) {
            final String path = entry.getKey();
            if (servletPath.startsWith(path)) {
                req.setCharacterEncoding(entry.getValue());

   */
  ALLOWS_NULL_VALUE_QUERIES,
  ALLOWS_NULL_VALUES(ALLOWS_NULL_VALUE_QUERIES),
  /**
   * The map does not throw {@code NullPointerException} on calls such as {@code
   * entrySet().contains(null)} or {@code entrySet().remove(null)}
   */
  ALLOWS_NULL_ENTRY_QUERIES,
  /**
   * The map does not throw {@code NullPointerException} on any {@code null} queries.
   *
   * @see #ALLOWS_NULL_KEY_QUERIES