All the parts have worked, though never simultaneously. I don't think we should draw conclusions from any one test that are irrevocable. What we have is a number of tests and legacy tests for all the elements of the system. The part we meant to test has worked one out of two times. Not too shabby.
Failure is no predictor of failure.
Since the part that failed prevented us from getting to the part we meant to test, the test never really happened. The kill vehicle was waiting for a signal that we had second-stage separation. We did not receive that signal. I would say we didn't get the data we had hoped to have. If the system doesn't work, it's just not big enough.