![image](https://user-images.githubusercontent.com/54169514/199922630-ba1b1417-e124-40b1-bac7-49158e2adbca.png)

文档上ApplicationConfig的enableFileCache属性默认true，但是在Dubbo3.1版本中，该属性似乎默认为null，导致mapping和元数据无法在本地缓存。

![image](https://user-images.githubusercontent.com/54169514/199923129-c99ea29b-45c5-40d1-bc21-1fbb44830fc7.png)

Map<String, String> parameters = new HashMap<String, String>();
        ApplicationConfig.appendParameters(parameters, application);
        assertThat(parameters, hasEntry(ACCEPT_FOREIGN_IP, "true"));
    }
    @Test
    void testParameters() throws Exception {
        ApplicationConfig application = new ApplicationConfig("app");
        application.setQosAcceptForeignIp(true);
        Map<String, String> parameters = new HashMap<String, String>();
        parameters.put("k1", "v1");
        ApplicationConfig.appendParameters(parameters, application);
        assertThat(parameters, hasEntry("k1", "v1"));
        assertThat(parameters, hasEntry(ACCEPT_FOREIGN_IP, "true"));
    }
    @Test
    void testAppendEnvironmentProperties() {
        ApplicationConfig application = new ApplicationConfig("app");
        SysProps.setProperty("dubbo.labels", "tag1=value1;tag2=value2 ; tag3 = value3");
        application.refresh();
        Map<String, String> parameters = application.getParameters();
        Assertions.assertEquals("value1", parameters.get("tag1"));
        Assertions.assertEquals("value2", parameters.get("tag2"));
        Assertions.assertEquals("value3", parameters.get("tag3"));
        ApplicationConfig application1 = new ApplicationConfig("app");
        SysProps.setProperty("dubbo.env.keys", "tag1, tag2,tag3");
        
        SysProps.setProperty("tag1", "value1");
        SysProps.setProperty("tag2", "value2");
        SysProps.setProperty("tag3", "value3");
        application1.refresh();