Micah Geisel sent in vim-testkey, a script for quickly running tests. You can press
<Space> in a test file to run the tests, and the same shortcut will trigger a save and rerun in non-test files.
It comes with built-in support for Cucumber and Mocha, but you can add your own test runner settings as well. You can also change the key mapping with
If you're a TDD practitioner then this might reduce the amount of times you switch to another terminal and press up/return. I use a file watch-based solution, but vim-testkey might be more efficient for large projects.