@Override
    public String toString() {
        return toStringHelper(getClass())
                .add("dsap", Byte.toString(dsap))
                .add("ssap", Byte.toString(ssap))
                .add("ctrl", Byte.toString(ctrl))
                .toString();
    }
@Test
    public void testToStringLLC() throws Exception {
        LLC llc = deserializer.deserialize(bytes, 0, bytes.length);
        String str = llc.toString();

        assertTrue(StringUtils.contains(str, "dsap=" + dsap));
        assertTrue(StringUtils.contains(str, "ssap=" + ssap));
        assertTrue(StringUtils.contains(str, "ctrl=" + ctrl));
    }