assertThat(function.apply("Null")).isNull();

    new EqualsTester()
        .addEqualityGroup(function, Functions.forMap(map, 42))
        .addEqualityGroup(Functions.forMap(map))
        .addEqualityGroup(Functions.forMap(map, null))
        .addEqualityGroup(Functions.forMap(map, 43))
        .testEquals();
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester

    assertThat(function.apply("Null")).isNull();

    new EqualsTester()
        .addEqualityGroup(function, Functions.forMap(map, 42))
        .addEqualityGroup(Functions.forMap(map))
        .addEqualityGroup(Functions.forMap(map, null))
        .addEqualityGroup(Functions.forMap(map, 43))
        .testEquals();
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester

    map.put("bar", 2);
    Multimap<String, Integer> multimapView = Multimaps.forMap(map);
    SerializableTester.reserializeAndAssert(multimapView);
  }

  public void testForMapRemoveAll() {
    Map<String, Integer> map = new HashMap<>();
    map.put("foo", 1);
    map.put("bar", 2);
    map.put("cow", 3);
    Multimap<String, Integer> multimap = Multimaps.forMap(map);
    assertEquals(3, multimap.size());

   * @param map the backing map for the returned multimap view
   */
  public static <K extends @Nullable Object, V extends @Nullable Object> SetMultimap<K, V> forMap(
      Map<K, V> map) {
    return new MapMultimap<>(map);
  }

  /**
   * @see Multimaps#forMap
   */
  private static final class MapMultimap<K extends @Nullable Object, V extends @Nullable Object>

   * @param map the backing map for the returned multimap view
   */
  public static <K extends @Nullable Object, V extends @Nullable Object> SetMultimap<K, V> forMap(
      Map<K, V> map) {
    return new MapMultimap<>(map);
  }

  /**
   * @see Multimaps#forMap
   */
  private static final class MapMultimap<K extends @Nullable Object, V extends @Nullable Object>

        for (int i = 0; i < objectsNum; i++) {
          objects.add(new Object());
        }

        Iterable<?> locks = striped.bulkGet(objects);
        assertTrue(Ordering.natural().onResultOf(Functions.forMap(indexByLock)).isOrdered(locks));

        // check idempotency
        Iterable<?> locks2 = striped.bulkGet(objects);
        assertEquals(Lists.newArrayList(locks), Lists.newArrayList(locks2));
      }
    }

        for (int i = 0; i < objectsNum; i++) {
          objects.add(new Object());
        }

        Iterable<?> locks = striped.bulkGet(objects);
        assertTrue(Ordering.natural().onResultOf(Functions.forMap(indexByLock)).isOrdered(locks));

        // check idempotency
        Iterable<?> locks2 = striped.bulkGet(objects);
        assertEquals(Lists.newArrayList(locks), Lists.newArrayList(locks2));
      }
    }

   *
   * <p>To use a plain {@link Map} as a {@link Function}, see {@link
   * com.google.common.base.Functions#forMap(Map)} or {@link
   * com.google.common.base.Functions#forMap(Map, Object)}.
   *
   * @since 16.0
   */
  public static <A, B> Converter<A, B> asConverter(BiMap<A, B> bimap) {
    return new BiMapConverter<>(bimap);
  }

   *
   * <p>To use a plain {@link Map} as a {@link Function}, see {@link
   * com.google.common.base.Functions#forMap(Map)} or {@link
   * com.google.common.base.Functions#forMap(Map, Object)}.
   *
   * @since 16.0
   */
  public static <A, B> Converter<A, B> asConverter(BiMap<A, B> bimap) {
    return new BiMapConverter<>(bimap);
  }

              }
            },
            Functions.forMap(INT_TO_STRING_MAP.inverse()));
    assertEquals(INT_TO_STRING_MAP, outputMap);
  }

  public void testUniqueIndexIterator() {
    ImmutableMap<Integer, String> outputMap =
        Maps.uniqueIndex(
            INT_TO_STRING_MAP.values().iterator(), Functions.forMap(INT_TO_STRING_MAP.inverse()));
    assertEquals(INT_TO_STRING_MAP, outputMap);
  }