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This means I can test all the Javascript that my rails applications use without opening a browser!

But then you won't know if all the JavaScript that your rails applications use will actually work in a browser. Some browser testing is still needed.

You can run cucumber + selenium. I'm pretty sure selenium can run in headless mode (haven't turned it on yet, too fun to watch!)

This is useful for tightening the feedback loop. Using something like Autotest gives me near-instant feedback on changes I'm making to client-side libraries.

I'll continue to periodically run my tests inside a "real" browser, but I think this sort of headless testing is a real win.

[Disclaimer: I wrote Johnson, so I'm not exactly a disinterested bystander. Edited for repetition.]

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