Via both Stephen Bainbridge and Will Baude, I took the latest “flavor of the month” quiz: the Libertarian Purity Test. I got a 50 out of a maximum 160, mainly because my hard-core minarchist libertarian views have subsided over time in favor of more practical politics.
IMHO, the quiz was actually pretty poorly engineered; the “libertarian” answer was always the “yes” answer. This sort of thing generally leads to response bias. But, the questions seemed to tap libertarian attitudes better than the infamous Political Compass does.