String expectedType = "OAuth";
        String expectedMessage = "OAuth token is invalid";

        try {
            throw new InvalidAccessTokenException(expectedType, expectedMessage);
        } catch (InvalidAccessTokenException e) {
            assertEquals(expectedType, e.getType());
            assertEquals(expectedMessage, e.getMessage());
            assertNull(e.getCause());
        }
    }

    @Test

    }

    @Test
    public void test_transform_nullResponseData() {
        try {
            transformer.transform(null);
            fail("Should throw CrawlingAccessException for null response");
        } catch (final CrawlingAccessException e) {
            assertTrue(e.getMessage().contains("No response body"));
        }
    }

    @Test
    public void test_transform_noResponseBody() {

            servletContext.setSessionTrackingModes(
                    fessConfig.getSessionTrackingModesAsSet().stream().map(SessionTrackingMode::valueOf).collect(Collectors.toSet()));
        } catch (final Throwable t) {
            logger.warn("Failed to set SessionTrackingMode.", t);
        }

                cause.printStackTrace(pw);
                pw.flush();
                sb.append(" [ ").append(sw.toString()).append(" ]");
            } catch (final IOException ignore) {}
            return sb.toString();
        };

        if (Constants.TRUE.equalsIgnoreCase(ComponentUtil.getFessConfig().getApiJsonResponseExceptionIncluded())) {

        response.setContentType(buf.toString());
        writeHeaders(response);
        try (PrintWriter out = new PrintWriter(new OutputStreamWriter(response.getOutputStream(), enc))) {
            out.print(text);
        } catch (final IOException e) {
            throw new IORuntimeException(e);
        }
    }

    /**
     * Writes custom headers to the HTTP response.
     * @param response The HTTP servlet response.
     */

        if (StringUtil.isNotBlank(name)) {
            try {
                return requestManager.getParameter(name).filter(StringUtil::isNotBlank).map(LocaleUtils::toLocale);
            } catch (final Exception e) {
                logger.debug("Failed to parse locale: name={}", name, e);
            }
        }
        return OptionalObject.empty();
    }

    @Override

        final SearchLogHelper searchLogHelper = ComponentUtil.getSearchLogHelper();

        final StringBuilder resultBuf = new StringBuilder();

        try {
            searchLogHelper.storeSearchLog();
        } catch (final Exception e) {
            logger.error("Failed to store a search log.", e);
            resultBuf.append(e.getMessage()).append("\n");
        }

        return resultBuf.toString();
    }

                } catch (final SuggestSettingsException e) {
                    logger.warn("Failed to add suggest field: field={}", field, e);
                }
            }));
            suggester.createIndexIfNothing();
        } catch (final Exception e) {
            logger.warn("Failed to initialize Suggester.", e);
        }
    }

        File unregisteredObject = new File("/tmp/test");

        try {
            serializer.fromObjectToBinary(unregisteredObject);
            fail("Should have thrown an exception for unregistered class");
        } catch (Exception e) {
            // Find the root cause - it should be related to unregistered class
            Throwable rootCause = e;
            while (rootCause.getCause() != null && rootCause.getCause() != rootCause) {

                languageHelper.getReindexScriptSource());
    }

    @Test
    public void test_init() {
        try {
            languageHelper.init();
            // Should not throw exception
        } catch (Exception e) {
            fail("init() should not throw an exception: " + e.getMessage());
        }
    }

    @Test
    public void test_updateDocument_withExistingLang() {