Sinatra

You can use Cucumber with Sinatra and Webrat!

Just make sure you have a features/support/env.rb file with the following:

# RSpec matchers
require 'spec/expectations'

# NOTE: This must come before the require 'webrat', otherwise sinatra will look in the wrong place for it's views.
require File.dirname(__FILE__) + '/../../your_sinatra_app'

# Webrat
require 'webrat'
Webrat.configure do |config|
  config.mode = :sinatra
end

World do
  Webrat::SinatraSession.new
end