@Test
void appendParameters2() {

    Map<String, String> source = new HashMap<>();
    source.put("default.num", "one1");
    source.put("num", "ONE1");
    source = AbstractBuilder.appendParameter(source, "default.num", "one");
    source = AbstractBuilder.appendParameter(source, "num", "ONE");
    Assertions.assertTrue(source.containsKey("default.num"));
    Assertions.assertEquals("ONE", source.get("num"));
}