}

    // Edge/Invalid: empty string is invalid for valueOf
    @ParameterizedTest
    @EmptySource
    @DisplayName("valueOf(\"\") throws IllegalArgumentException for empty input")
    void valueOfRejectsEmpty(String empty) {
        assertThrows(IllegalArgumentException.class, () -> RequestParam.valueOf(empty));
    }

    // Invalid: null is not allowed for valueOf

        // Verify
        assertNull(result);
    }

    // Test logout method
    public void test_logout_withValidUser() {
        // Setup
        FessUserBean user = FessUserBean.empty();
        String expectedUrl = "https://example.com/logout?user=testuser123";
        authenticator.setLogoutUrl(expectedUrl);

        // Execute
        String result = authenticator.logout(user);

     * @return An optional entity containing the stopwords file, or empty if not found.
     */
    public OptionalEntity<StopwordsFile> getStopwordsFile(final String dictId) {
        return dictionaryManager.getDictionaryFile(dictId)
                .filter(StopwordsFile.class::isInstance)
                .map(file -> OptionalEntity.of((StopwordsFile) file))
                .orElse(OptionalEntity.empty());
    }

    /**

     * @return An optional entity containing the synonym file, or empty if not found.
     */
    public OptionalEntity<SynonymFile> getSynonymFile(final String dictId) {
        return dictionaryManager.getDictionaryFile(dictId)
                .filter(SynonymFile.class::isInstance)
                .map(file -> OptionalEntity.of((SynonymFile) file))
                .orElse(OptionalEntity.empty());
    }

    /**

     */
    public String getInput() {
        return input;
    }

    /**
     * Gets the input value or empty string if null.
     * @return the input value or empty string
     */
    public String getInputValue() {
        if (input == null) {
            return StringUtil.EMPTY;
        }
        return input;
    }

    /**
     * Checks if this item has been updated.

    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;
  }

  /**

		return &minioFileInfo{
			p:     SlashSeparator,
			isDir: true,
		}, nil
	}

	bucket, object := path2BucketObject(objPath)
	if bucket == "" {
		return nil, errors.New("bucket name cannot be empty")
	}

	clnt, err := driver.getMinIOClient(ctx)
	if err != nil {
		return nil, err
	}

	if object == "" {
		ok, err := clnt.BucketExists(context.Background(), bucket)
		if err != nil {

        public Map<String, Object> toSource() {
            return null;
        }

        @Override
        public String getEventType() {
            return null;
        }
    }

    // Test empty values implementation
    private static class EmptySearchLogEvent implements SearchLogEvent {
        @Override
        public String getId() {
            return "";
        }

        @Override

    }

    @Test
    @DisplayName("Test PacDataInputStream readString with empty string")
    void testReadEmptyString() throws Exception {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(baos);

        // Write an empty string structure
        writeLittleEndianInt(dos, 0); // totalChars

          .put(Locale.class, Locale.US)
          .put(Optional.class, Optional.empty())
          .put(OptionalInt.class, OptionalInt.empty())
          .put(OptionalLong.class, OptionalLong.empty())
          .put(OptionalDouble.class, OptionalDouble.empty())
          .put(UUID.class, UUID.randomUUID())
          // common.base
          .put(CharMatcher.class, CharMatcher.none())