@Test
void appendParameters() {

    Map<String, String> source = new HashMap<>();
    source.put("default.num", "one");
    source.put("num", "ONE");
    ConfigCenterBuilder builder = new ConfigCenterBuilder();
    builder.appendParameters(source);
    Map<String, String> parameters = builder.build().getParameters();
    Assertions.assertTrue(parameters.containsKey("default.num"));
    Assertions.assertEquals("ONE", parameters.get("num"));
}