Allow custom rack build on top of jasmine-gem

jasmine_config.rb

# Custom jasmine config based to allow Sprockets assets (+ CoffeeScript) when writing tests on a Sinatra stack.
#
# Based heisters gist and patch which was for version 1.2.0
#   https://gist.github.com/1695818
#   https://github.com/heisters/jasmine-gem/commit/15277ed7885a5d08ab84d2a4a2417e0d22564c07
# Simply did a small port of this to the latest version of Jasmine.
#
# For the custom rack build to work you have to setup the gem to use the patched version to work correctly.
# E.g. using bundler put this in your Gemfile:
#   gem 'jasmine', :git => 'https://github.com/viddo/jasmine-gem.git'
require 'sprockets'
require 'coffee_script'

module Jasmine
  class Config
    # Add your overrides or custom config code here

    def custom_rack_build rack
      this = self #Rack 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'
        run sprockets
      end

      # Allows spec files to also be written in CoffeeScript and run through a Sprockets instance.
      rack.map '/__spec__' do
        sprockets = Sprockets::Environment.new this.project_root
        sprockets.append_path 'spec/javascripts/specs'
        run sprockets
      end
    end
  end
end

yasmine.yml

# Example meta-config matching the custom jasmine_config.rb paths.
src_files:
  - assets/javascripts/myapp/application.js

src_dir: assets/


spec_files:
  - myapp/application_spec.js

spec_dir: spec/javascripts/specs


stylesheets:

helpers: