}

    @Test
    @DisplayName("byte[] ctor: empty token throws PACDecodingException with clear message")
    void byteArrayConstructor_emptyToken_throws() {
        // Arrange
        byte[] empty = new byte[0];

        // Act + Assert
        PACDecodingException ex = assertThrows(PACDecodingException.class, () -> new KerberosApRequest(empty, new KerberosKey[0]));

        FileUtil.readBytes(file, 0);
    }

    /**
     * Test readBytes with custom maxSize for empty file
     *
     * @throws Exception
     */
    @Test
    public void testReadBytes_CustomMaxSize_EmptyFile() throws Exception {
        final File file = tempFolder.newFile("empty.txt");

        // Empty file should work with any maxSize including 0

        return StringUtil.isBlank(s) ? StringUtil.EMPTY : "/" + s;
    }

    /**
     * Gets the virtual host key from the current request.
     * The key is determined by matching HTTP headers against configured virtual hosts.
     *
     * @return The virtual host key, or empty string if no match found
     */
    public String getVirtualHostKey() {

    }

    /**
     * Test extraction with empty input stream.
     */
    public void test_getText_emptyInputStream_returnsEmptyContent() {
        final InputStream in = new ByteArrayInputStream(new byte[0]);

        final ExtractData result = textExtractor.getText(in, null);

        assertNotNull(result);
        assertNotNull(result.getContent());

   * @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;
  }

   * in the same order. If the value orderings disagree, the multimaps will not be considered equal.
   *
   * <p>An empty {@code ListMultimap} is equal to any other empty {@code Multimap}, including an
   * empty {@code SetMultimap}.
   */
  @Override
  boolean equals(@Nullable Object obj);

   * in the same order. If the value orderings disagree, the multimaps will not be considered equal.
   *
   * <p>An empty {@code ListMultimap} is equal to any other empty {@code Multimap}, including an
   * empty {@code SetMultimap}.
   */
  @Override
  boolean equals(@Nullable Object obj);

    return CollectCollectors.toImmutableRangeSet();
  }

  /**
   * Returns an empty immutable range set.
   *
   * <p><b>Performance note:</b> the instance returned is a singleton.
   */
  @SuppressWarnings("unchecked")
  public static <C extends Comparable> ImmutableRangeSet<C> of() {
    return (ImmutableRangeSet<C>) EMPTY;
  }

  /**

  /**
   * 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

        () -> 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);