void testPreAndPostProcessing() throws BeanConfigurationException {
        SomeBean bean = new SomeBean();

        Xpp3Dom config = toConfig("<file>${test}</file>");

        BeanConfigurationValuePreprocessor preprocessor = (value, type) -> {
            if (value != null && value.startsWith("${") && value.endsWith("}")) {
                return value.substring(2, value.length() - 1);
            }
            return value;
        };