Hannemaf might be onto something here.
How about some test which could verify static routes between ipv6 networks?
For example: I have several sites that have direct tunnels to HE and, because of their interplay, direct tunnels between each other. What if there was a test which could verify ipv6 connectivity directly between these two networks? (for instance, HE pings a host on network A through the tunnel interface to network B.) This would likely make for a better one-time-test rather than a series of daily tests.
Forgive any poor conceptualization, as I am also writing this after a long day.