StringSubscriber s2 = new StringSubscriber();
    ObjectSubscriber o1 = new ObjectSubscriber();

    Iterator<Subscriber> empty = registry.getSubscribers("");
    assertFalse(empty.hasNext());

    empty = registry.getSubscribers("");

    registry.register(s1);
    assertFalse(empty.hasNext());

    Iterator<Subscriber> one = registry.getSubscribers("");
    assertEquals(s1, one.next().target);

    }

    @Test
    @DisplayName("Test readParametersWireFormat with empty buffer")
    void testReadParametersWireFormatEmptyBuffer() throws Exception {
        byte[] buffer = new byte[0];

        // Empty buffer adds one empty FileNotifyInformation
        int result = response.readParametersWireFormat(buffer, 0, 0);
        assertEquals(0, result);

        () -> EnumHashBiMap.create(Collections.<Currency, String>emptyMap()));

    /* Map can be empty if it's an EnumHashBiMap. */
    Map<Currency, String> emptyBimap = EnumHashBiMap.create(Currency.class);
    bimap = EnumHashBiMap.create(emptyBimap);
    assertTrue(bimap.isEmpty());

    /* Map can be empty if it's an EnumBiMap. */
    Map<Currency, Country> emptyBimap2 = EnumBiMap.create(Currency.class, Country.class);

 * @since 4.0.0
 */
@Experimental
public interface Interpolator extends Service {

    /**
     * Interpolates the values in the given map using the provided callback function.
     * This method defaults to setting empty strings for unresolved placeholders.
     *
     * @param properties The map containing key-value pairs to be interpolated.
     * @param callback The function to resolve variable values not found in the map.
     */

        // Verify num_sids
        assertEquals(0, lsarSidArrayX.num_sids, "num_sids should be 0 for an empty array");

        // Verify sids array
        assertNotNull(lsarSidArrayX.sids, "sids array should not be null for an empty array");
        assertEquals(0, lsarSidArrayX.sids.length, "sids array length should be 0 for an empty array");
    }

    @Test
    void testConstructorWithNullSIDArray() {
        jcifs.SID[] sids = null;

   * @return {@code string} itself if it is nonempty; {@code null} if it is empty or null
   */
  public static @Nullable String emptyToNull(@Nullable String string) {
    return Platform.emptyToNull(string);
  }

  /**
   * Returns {@code true} if the given string is null or is the empty string.
   *
   * <p>Consider normalizing your string references with {@link #nullToEmpty}. If you do, you can

  /**
   * Creates an empty {@code ArrayBlockingQueue} with the given (fixed) capacity and nonfair access
   * policy.
   */
  @J2ktIncompatible
  @GwtIncompatible // ArrayBlockingQueue
  public static <E> ArrayBlockingQueue<E> newArrayBlockingQueue(int capacity) {
    return new ArrayBlockingQueue<>(capacity);
  }

  // ArrayDeque

  /**
   * Creates an empty {@code ArrayDeque}.
   *
   * @since 12.0

  /**
   * Creates an empty {@code ArrayBlockingQueue} with the given (fixed) capacity and nonfair access
   * policy.
   */
  @J2ktIncompatible
  @GwtIncompatible // ArrayBlockingQueue
  public static <E> ArrayBlockingQueue<E> newArrayBlockingQueue(int capacity) {
    return new ArrayBlockingQueue<>(capacity);
  }

  // ArrayDeque

  /**
   * Creates an empty {@code ArrayDeque}.
   *
   * @since 12.0

     */
    public OptionalEntity<StemmerOverrideFile> getStemmerOverrideFile(final String dictId) {
        return dictionaryManager.getDictionaryFile(dictId)
                .filter(StemmerOverrideFile.class::isInstance)
                .map(file -> OptionalEntity.of((StemmerOverrideFile) file))
                .orElse(OptionalEntity.empty());
    }

    /**

   * @throws NullPointerException if any element in the stream is {@code null}.
   * @return {@code Optional.of(onlyElement)} if the stream has exactly one element (must not be
   *     {@code null}) and returns {@code Optional.empty()} if it has none.
   */
  @SuppressWarnings("unchecked")
  public static <T> Collector<T, ?, Optional<T>> toOptional() {
    return (Collector) TO_OPTIONAL;
  }