public static String getKey(String dataId, String group) {
        StringBuilder sb = new StringBuilder();
        urlEncode(dataId, sb);
        sb.append('+');
        urlEncode(group, sb);
        return sb.toString();
    }
@Test
    void testGetKeyByThreeParams() {
        
        // Act
        final String actual = GroupKey2.getKey(",", ",", "3");
        
        // Assert result
        assertEquals(",+,+3", actual);
    }