Testing root server down code

Wed Oct 23 17:34:17 UTC 2002

The last time all the root servers were down was June 28 1985.  On June 29
1985 there was a flurry of messages about adding root server down code to
the various DNS implementations of the day.  Apparently, some of the
software had a poor response to all root servers being unreachable, and
spun out of control.

Has anyone tested modern DNS code (Microsoft and BIND to name two) for
this condition recently?  I haven't, hence my question.