tpope/vim-rails — pull request #191 by rking (2012-10-25 04:50:09+00:00)
Title:  Support direct mapping between app/* ↔ test/* 

In fact, I went as far as making it the first one on the list, so it's
hinted that it's the new way.

I tested as thoroughly as I could think to, but it definitely needs review by others before it's good.

I really like the new, simpler dir structure.