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[adiblol]

Some of certification tests could cover IPv6 firewall. For example:

make HTTP server (preferably on non-default port -- if not can be harmful for production servers) reachable only from 2001:db8:1337:cafe::/64 (of course this is example netmask).

More complicated filters could be:
remote TCP port,
or even ip6tables-specific like
break connection after sending 16384 bytes (could be cheated with httpd, however)
quota

etc etc
...

[nickbeee]

Some of certification tests could cover IPv6 firewall. For example:

make HTTP server (preferably on non-default port -- if not can be harmful for production servers) reachable only from 2001:db8:1337:cafe::/64 (of course this is example netmask).

Anything would need to be OS-neutral in my opinion. I did this for my test setup for the http and smtp servers by setting up an ipv6 access list on my router.