Check this out:
https://github.com/BenoitZugmeyer/chwitt for unit testing
Also, check out how node-webkit runs their tests against their own build. I'm still working on taking that knowledge and doing something with it, but it may help you as well to take a look at these things. node-webkit uses Chromedriver2 in their tests, so you may find it more helpful than the chwitt demo.
The main problem I ran into with chwitt's method of testing is all the test files are loaded as node.js modules, which means you lose the node-webkit portion of things... I'm working on making it so that tests run inside node-webkit so that everything is testable...
Hope this helps,
James