*
   * @return the replacement characters, or {@code null} if no escaping was required
   */
  @Override
  protected final char @Nullable [] escape(char c) {
    if (c < replacementsLength) {
      char[] chars = replacements[c];
      if (chars != null) {
        return chars;
      }
    }
    if (c >= safeMin && c <= safeMax) {
      return null;
    }
    return escapeUnsafe(c);
  }

  /**

        CurlException exception = new CurlException(null);

        assertNull(exception.getMessage());
        assertNull(exception.getCause());
    }

    @Test
    public void testConstructorWithNullMessageAndCause() {
        IOException cause = new IOException("IO error");
        CurlException exception = new CurlException(null, cause);

        assertNull(exception.getMessage());

    }

    /**
     * Checks if the request header is valid.
     * A header is considered valid if its name is not blank and its value is not null.
     * @return true if the header is valid, false otherwise.
     */
    public boolean isValid() {
        if (StringUtil.isBlank(name) || value == null) {
            return false;
        }

        return true;
    }

     * @param challenge the server challenge (may be null for some auth types)
     * @return authentication response data
     * @throws CIFSException if authentication fails
     */
    byte[] authenticate(CIFSContext context, byte[] challenge) throws CIFSException;

    /**
     * Gets the session key after successful authentication
     *
     * @return the session key or null if not available
     */
    byte[] getSessionKey();

            logger.warn("Failed to create temp file, using null", e);
            return null;
        }
    }

    private void loadTestProperties() {
        // Load system.properties from test classpath
        try (InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream("system.properties")) {
            if (is != null) {
                Properties props = new Properties();

    }

    @Override
    public void tearDown() throws Exception {
        ComponentUtil.setFessConfig(null);
        super.tearDown();
    }

    public void test_init() {
        // Test initialization with null fields
        queryFieldConfig.init();

        // Verify response fields are initialized
        assertNotNull(queryFieldConfig.getResponseFields());

            }

            final byte[] data = accessResultData.getData();
            if (data == null) {
                return null;
            }
            final String encoding = accessResultData.getEncoding();
            try {
                return new String(data, encoding == null ? Constants.UTF_8 : encoding);
            } catch (final UnsupportedEncodingException e) {

    }

    @Test
    void testGetByNameWithName() {
        // Test the internal getByName method that takes a Name object
        Name name = new Name(mockConfig, "TESTHOST", 0x20, null);
        when(mockConfig.getLmHostsFileName()).thenReturn(null);

        NbtAddress result = lmhosts.getByName(name, mockContext);

        assertNull(result);
    }

    @Test

    }

    @Test
    public void testDeleteScrollContext() {
        // Test with null scrollId (should not throw exception)
        SuggestUtil.deleteScrollContext(client, null);

        // Test with non-null scrollId
        String scrollId = "test_scroll_id";
        SuggestUtil.deleteScrollContext(client, scrollId);
        // No exception should be thrown

                }
            }
        } catch (IOException e) {
            throw new PACDecodingException("Malformed PAC", e);
        }

        if (this.serverSignature == null || this.kdcSignature == null || this.logonInfo == null) {
            throw new PACDecodingException("Missing required buffers");
        }

        if (log.isTraceEnabled()) {