int idx = 0;
                for (Entry<K, V> e : map.entrySet()) {
                    entries[idx++] = new SimpleImmutableEntry<>(e.getKey(), e.getValue());
                }
            } else {
                entries = new Object[0];
            }
        }

        @Override
        public Set<Entry<K, V>> entrySet() {
            return new AbstractImmutableSet<>() {
                @Override

    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));

   */
  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

    List<Entry<V, K>> reversedEntries = new ArrayList<>();
    for (Entry<K, V> entry : expected) {
      reversedEntries.add(reverseEntry(entry));
    }
    assertEqualIgnoringOrder(getMap().inverse().entrySet(), reversedEntries);

    for (Entry<K, V> entry : expected) {
      assertEquals(
          "Wrong key for value " + entry.getValue(),
          entry.getKey(),
          getMap().inverse().get(entry.getValue()));

        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());

            } else if (StringUtil.isNotEmpty(resourceName)) {
                value = resourceName;
            }

            if (value != null) {
                for (final Map.Entry<Pattern, String> entry : passwordMap.entrySet()) {
                    if (entry.getKey().matcher(value).matches()) {
                        return entry.getValue();
                    }
                }
            }
        }

    map.remove("bar");
    assertThat(map.entrySet())
        .containsExactly(immutableEntry("foo", 1), immutableEntry("quux", 3))
        .inOrder();
  }

  public void testInsertionOrderAfterRemoveLast() {
    BiMap<String, Integer> map = HashBiMap.create();
    map.put("foo", 1);
    map.put("bar", 2);
    map.put("quux", 3);

    map.remove("quux");
    assertThat(map.entrySet())

  }

  /**
   * A sensible definition of {@link #firstEntry()} in terms of {@code entrySet().iterator()}.
   *
   * <p>If you override {@link #entrySet()}, you may wish to override {@link #firstEntry()} to
   * forward to this implementation.
   */
  protected @Nullable Entry<E> standardFirstEntry() {
    Iterator<Entry<E>> entryIterator = entrySet().iterator();
    if (!entryIterator.hasNext()) {
      return null;
    }

    // TODO: can these be moved to MapInterfaceTest?
    for (Entry<K, V> entry : map.entrySet()) {
      assertEquals(entry.getKey() + "=" + entry.getValue(), entry.toString());
    }

    assertEquals("{" + JOINER.join(map.entrySet()) + "}", map.toString());
    assertEquals("[" + JOINER.join(map.entrySet()) + "]", map.entrySet().toString());
    assertEquals("[" + JOINER.join(map.keySet()) + "]", map.keySet().toString());

    // TODO: can these be moved to MapInterfaceTest?
    for (Entry<K, V> entry : map.entrySet()) {
      assertEquals(entry.getKey() + "=" + entry.getValue(), entry.toString());
    }

    assertEquals("{" + JOINER.join(map.entrySet()) + "}", map.toString());
    assertEquals("[" + JOINER.join(map.entrySet()) + "]", map.entrySet().toString());
    assertEquals("[" + JOINER.join(map.keySet()) + "]", map.keySet().toString());