This is an assemblage of files pulling together a bunch of vim, tmux, and zsh configurations borrowed from elsewhere, particularly Chris Toomey, whose vim configuration I have found to be stellar.
I'm big into the Solarized color scheme, and an rbenv user, and all configurations seek to leverage those preferences wherever possible. Tmux is the glue that holds the whole thing together, and is intended to be turned on basically all the time.
Ruby testing can be run straight from vim, and keyboard navigation is seamless between Tmux and vim. I'm not nearly clever enough to have cooked this up on my own, but I'm smart enough to use it.