*       channel have their own file descriptors. Generally this only happens when both channels
   *       are files or sockets. This performs zero copies - the bytes never enter userspace.
   *   <li>Use mmap(2) or equivalent. Requires that either the input channel or the output channel
   *       have file descriptors. Bytes are copied from the file into a kernel buffer, then directly

        assertThat(map.containsKey("3"), is(not(true)));
        map.put("3", null);
        assertThat(map.containsKey("3"), is(true));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testIndexOf() throws Exception {
        assertThat(map.indexOf("test"), is(1));
        assertThat(map.indexOf(null), is(0));
        assertThat(map.indexOf("test3"), is(-1));

	current     *apiPackage
	deprecated  map[token.Pos]bool
	features    map[string]bool              // set
	imported    map[string]*apiPackage       // packages already imported
	stdPackages []string                     // names, omitting "unsafe", internal, and vendored packages
	importMap   map[string]map[string]string // importer dir -> import path -> canonical path
	importDir   map[string]string            // canonical import path -> dir

    Map<String, Long> in = ImmutableMap.of("1", 1L, "2", 2L, "3", 3L);
    AtomicLongMap<String> map = AtomicLongMap.create();
    assertTrue(map.isEmpty());
    assertEquals(0, map.size());
    assertFalse(map.containsKey("1"));
    assertFalse(map.containsKey("2"));
    assertFalse(map.containsKey("3"));
    assertEquals(0L, map.get("1"));
    assertEquals(0L, map.get("2"));
    assertEquals(0L, map.get("3"));

    map.putAll(in);

        map.put("チ", new String[] { "ti", "chi" });
        map.put("ツ", new String[] { "tu", "tsu" });
        map.put("テ", new String[] { "te" });
        map.put("ト", new String[] { "to" });

        map.put("ナ", new String[] { "na" });
        map.put("ニ", new String[] { "ni" });
        map.put("ヌ", new String[] { "nu" });
        map.put("ネ", new String[] { "ne" });
        map.put("ノ", new String[] { "no" });

    }

    /**
     * Gets a nested Map from the map.
     *
     * @param map The source map
     * @param key The key to look up
     * @return The nested Map, or null if the key doesn't exist or value is not a Map
     */
    @SuppressWarnings("unchecked")
    public static Map<String, Object> getMap(final Map<String, Object> map, final String key) {
        final Object value = map.get(key);
        if (value instanceof Map) {

        .testForwarding(
            Map.class,
            new Function<Map, Map>() {
              @Override
              public Map apply(Map delegate) {
                return wrap(delegate);
              }
            });
  }

  public void testEquals() {
    Map<Integer, String> map1 = ImmutableMap.of(1, "one");
    Map<Integer, String> map2 = ImmutableMap.of(2, "two");

            return Map.of();
        }
    }

    /**
     * Gets a nested map value from the given map.
     *
     * @param map the source map.
     * @param key the key to look up.
     * @return the map value, or {@code null} if not found or not a map.
     */
    @SuppressWarnings("unchecked")
    protected Map<String, Object> getMapValue(final Map<String, Object> map, final String key) {

  }

  @LazyInit private transient @Nullable Map<R, Map<C, V>> rowMap;

  @Override
  public Map<R, Map<C, V>> rowMap() {
    Map<R, Map<C, V>> result = rowMap;
    return (result == null) ? rowMap = createRowMap() : result;
  }

  Map<R, Map<C, V>> createRowMap() {
    return new RowMap();
  }

  @WeakOuter
  class RowMap extends ViewCachingAbstractMap<R, Map<C, V>> {
    @Override

    assertTrue(map.equals(map));
    assertTrue(makeEmptyMap().equals(map));
    assertEquals(emptyMap(), map);
    assertFalse(map.equals(emptySet()));
    // noinspection ObjectEqualsNull
    assertFalse(map.equals(null));
  }

  public void testGet() {
    Map<K, V> map;
    try {
      map = makePopulatedMap();
    } catch (UnsupportedOperationException e) {