Does anyone know whether there is anything similar to capybara for Node.js?
Yes, see expresso and more here - Unit testing framework for node.js that specifically supports testing async code?
I'm a rails-turned-node developer and I've always been looking for a analogy in the JS world for the winning RSpec/Capybara combination. Here is what I've found what I like best.
Here is a more involved post on how to set up this stack including continuous test running.
Happy Testing!