testProcessHelper = new TestProcessHelper();
        ComponentUtil.register(testProcessHelper, "processHelper");

        testFessConfig = new TestFessConfig() {
            @Override
            public String getPythonCommandPath() {
                return "python3";
            }
        };
        ComponentUtil.setFessConfig(testFessConfig);

        testServletContext = new TestServletContext();

        if (StringUtil.isBlank(filename)) {
            throw new JobProcessingException("Python script is not specified.");
        }

        cmdList.add(fessConfig.getPythonCommandPath());

        cmdList.add(getPyFilePath());

        cmdList.addAll(argList);

        try {

            final File baseDir = new File(servletContext.getRealPath("/WEB-INF")).getParentFile();

     * The value is, e.g. python <br>
     * comment: Path to Python command.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getPythonCommandPath();

    /**
     * Get the value for the key 'path.encoding'. <br>
     * The value is, e.g. UTF-8 <br>
     * comment: Encoding for file paths.