assertThat(InetAddresses.toAddrString(parsed)).contains("%");
        if (isNumeric) {
          assertEquals(parseInt(scopeId), parsed.getScopeId());
        } else {
          assertThat(parsed.getScopedInterface().getName()).isEqualTo(scopeId);
        }
        Inet6Address reparsed =
            (Inet6Address) InetAddresses.forString(InetAddresses.toAddrString(parsed));
        assertThat(reparsed).isEqualTo(parsed);

    // mapped interface isn't present, fallback to use the scope ID (which has no validation against
    // present interfaces)
    NetworkInterface scopedInterface = ip.getScopedInterface();
    if (scopedInterface != null) {
      return "%" + scopedInterface.getName();
    }
    int scope = ip.getScopeId();
    if (scope != 0) {
      return "%" + scope;
    }
    return "";