If the DNS resolution fails for your redis server, ruby will throw a SocketError, which is currently not rescued by the ab_test helper

[fusion2004]

Protip: Don't delete a redis instance your production server is currently using.

If wanted, I can add both:

1. Checking for the specific error message DNS resolution failures produce: getaddrinfo: Name or service not known
2. A test for raising this specific error, though I'm not exactly where it should go. The helper_spec.rb file does have tests for redis being unavailable, but it currently only tests the raise of Errno::ECONNREFUSED and not Redis::CannotConnectError.

[andrew]

Thanks @fusion2004!