// Register mock helpers
        ComponentUtil.register(new SystemHelper() {
            @Override
            public String getLogFilePath() {
                return tempDir.getAbsolutePath();
            }
        }, "systemHelper");

        ComponentUtil.register(new ProcessHelper() {
            @Override

        return LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
    }

    /**
     * Gets the path to the log file.
     *
     * @return The log file path.
     */
    public String getLogFilePath() {
        final String value = System.getProperty("fess.log.path");
        if (value != null) {
            return value;
        }
        final String userDir = System.getProperty("user.dir");

     * @param id the diagnostic ID for organizing files in the ZIP
     */
    protected void writeLogFiles(final ZipOutputStream zos, final String id) {
        final String logFilePath = systemHelper.getLogFilePath();
        if (StringUtil.isNotBlank(logFilePath)) {
            final Path logDirPath = Paths.get(logFilePath);
            try (Stream<Path> stream = Files.list(logDirPath)) {

    public void test_getLogFilePath() {
        final File logFile = new File(systemHelper.getLogFilePath());
        assertEquals("logs", logFile.getName());
        assertEquals("target", logFile.getParentFile().getName());
        try {
            System.setProperty("fess.log.path", "logpath");
            assertEquals("logpath", systemHelper.getLogFilePath());
        } finally {
            System.clearProperty("fess.log.path");
        }