That this special case for the inproc transport no longer exists is one of the documented improvements in version 4, so we can skip the test if that's the version being used. This is also the only test that fails with ØMQ v4.0.3, so it might be worth doing a release for.
Skip test for special case that is no longer special in zmq v4.
Cool. As an added bonus, it would be nice if you could change the settings on this repo so that Travis CI tests are run against libzmq4.x