Sinatra + Sprockets + Jasmine + Coffeescript

jasmine.yml

src_files:
  - assets/javascripts/app.js.coffee
  - assets/spec.js.coffee
# ...
stylesheets:
  - assets/stylesheets/app.css

jasmine_config.rb

# requires the jasmine patch at https://github.com/heisters/jasmine-gem/commit/15277ed7885a5d08ab84d2a4a2417e0d22564c07
require 'sprockets'
module Jasmine
  class Config
    # Add your overrides or custom config code here

    # This rack builder definition is a stripped-down version of my config.ru
    def rack_app rack
      this = self # Rack fuckaz are using instance_eval, so the default receiver is about to change
      rack.map '/assets' do
        sprockets = Sprockets::Environment.new this.project_root
        sprockets.append_path 'assets'
        sprockets.append_path 'spec/javascripts'
        run sprockets
      end
    end
  end
end

spec.js.coffee

#= require_tree .