@Override
    public String getString(String path) {
        return fileConfig.getString(path);
    }
@Test
    void getString() {
        SimpleFileConfig config = new SimpleFileConfig();
        Assertions.assertEquals(File.pathSeparator, config.getString("path.separator"));
        
        config = new SimpleFileConfig(new File("file.conf"), "");
        Assertions.assertEquals("default", config.getString("service.vgroupMapping.default_tx_group"));
        
        config = new SimpleFileConfig(new File("src/test/resources/file"), "file:");
        Assertions.assertEquals("default", config.getString("service.vgroupMapping.default_tx_group"));
    }