*
     * @param userCode the unique code identifying the user
     * @param urlList the list of URLs to check against the user's favorites
     * @return a list of URLs from the input list that are in the user's favorites, or an empty list if the user is not found or has no matching favorites
     */
    public List<String> getUrlList(final String userCode, final List<String> urlList) {
        if (urlList.isEmpty()) {
            return urlList;
        }

        // Should have empty arrays initially
        assertEquals(0, protocolHelper.getWebProtocols().length);
        assertEquals(0, protocolHelper.getFileProtocols().length);
    }

    @Test
    public void test_loadProtocols_emptyPackage() {
        final ProtocolHelper protocolHelper = new ProtocolHelper();

        // Should not throw exception with empty package
        protocolHelper.loadProtocols("");

        emptyGenerator = new EmptyGenerator();

        // Test basic functionality
        Map<String, Object> docMap = new HashMap<>();
        docMap.put("id", "doc123");

        emptyGenerator.setName("empty");
        String path = "/path/to/thumbnail.jpg";

        // Since createTask requires FessConfig, it may not work properly
        // We test that the method can be called without throwing exceptions
        try {

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

    @Test
    public void test_constructorWithEmptyMessage() {
        // Test constructor with empty message
        String message = "";
        ScheduledJobException exception = new ScheduledJobException(message);

        assertEquals(message, exception.getMessage());
        assertNull(exception.getCause());
    }

        Objects.requireNonNull(cmd, "cmd");
        if (cmd.length == 0) throw new IllegalArgumentException("cmd must not be empty");
        ProcessBuilder pb = new ProcessBuilder(cmd);
        Process p = pb.start();
        Future<String> outFuture = readStreamAsync(p.getInputStream());

        assertEquals("User is not found: testuser", exception.getMessage());
        assertNull(exception.getCause());
    }

    @Test
    public void test_constructor_withEmptyUsername() {
        // Test with empty username
        String username = "";
        FessUserNotFoundException exception = new FessUserNotFoundException(username);

        assertNotNull(exception);

        // Test with null message
        RuntimeException nullMessageEx = new RuntimeException();
        assertNull(nullMessageEx.getMessage());

        // Test with empty message
        RuntimeException emptyMessageEx = new RuntimeException("");
        assertEquals("", emptyMessageEx.getMessage());
    }

    // Test JSON response creation helper
    @Test

            break;
        default:
            break;
        }
        return OptionalEntity.empty();
    }

    /**
     * Creates a ScheduledJob entity from the provided form data.
     *
     * @param form the form containing the scheduled job data
     * @return optional entity containing the scheduled job data, or empty if creation fails
     */

        // Guard against division by zero (should not happen due to caller checks, but defensive)
        if (searchers.length == 0) {
            logger.warn("searchWithMultipleSearchers called with empty searcher array");
            return createResponseList(Collections.emptyList(), 0, Relation.EQUAL_TO.toString(), 0, false, null, params.getStartPosition(),
                    params.getPageSize(), 0);
        }

        List<Map<String, Object>> documentList = new ArrayList<>();
        QueryResponseList qrList = new QueryResponseList(documentList, 0, 10, 0);

        // Test operations on empty list
        assertTrue(qrList.isEmpty());
        assertEquals(0, qrList.size());

        assertFalse(qrList.remove(new HashMap<>()));
        assertFalse(qrList.contains(new HashMap<>()));