public static String getKey(String dataId, String group) {
        return getKey(dataId, group, "");
    }
@Test
    void testGetKey() {
        assertEquals("1+foo", GroupKey.getKey("1", "foo"));
        assertEquals("1+foo+bar", GroupKey.getKey("1", "foo", "bar"));
        assertEquals("1+f%2Boo+b%25ar", GroupKey.getKey("1", "f+oo", "b%ar"));
    }