@bkeepers That seems odd to me unless the specs are expected to fail on that platform.  If the sort of shell variable interpolation in the failing spec is supposed to fail on JRuby and Rubinius, then that would be fine, but should be documented in the README.  If not, then I think the underlying behavior needs to be fixed on those platforms.

I don't know enough about the intended behavior to say which way it should be - one or the other.