Why is it so hard for the test track to be outside the place where they're manufactured? When a car is done it would drive through a "course" by itself, since it is autonomous... or at least they want us to be believe it is. Can see the job description now: Driver required for autonomous vehicle test course, must be able to maintain the stability of the vehicle with automated cars on the road that may occasionally divert from their intended path. Comes with great benefits.
but seriously, Tests could be simulated with the same kind of course a drivers ed student supposedly goes through, and there's no reason these things shouldn't be able to drive themselves to an offsite storage facility, even if it is controlled roads or roads with caution signs. Simulations don't account for faults in the design or manufacturing.