Cucumber tests on static app


I’m going to write acceptance tests using cucumber. the problem is, my
application is not a rails based one. it’s a set of javascript
and html files tied together (with ext.js and sencha touch actually).

As far as I know, to use cucumber (possibly with capybara) I would need
a rack-based app. Is there any simple way to “wrap” my static files into
rack compliant application, so I could test it with cucumber?