javascript_include_tag

# File actionpack/lib/sprockets/helpers/rails_helper.rb, line 22
      def javascript_include_tag(*sources)
        options = sources.extract_options!
        debug = options.key?(:debug) ? options.delete(:debug) : debug_assets?
        body  = options.key?(:body)  ? options.delete(:body)  : false

        sources.collect do |source|
          if debug && asset = asset_paths.asset_for(source, 'js')
            asset.to_a.map { |dep|
              javascript_include_tag(dep, :debug => false, :body => true)
            }.join("\n").html_safe
          else
            tag_options = {
              'type' => "text/javascript",
              'src'  => asset_path(source, 'js', body)
            }.merge(options.stringify_keys)

            content_tag 'script', "", tag_options
          end
        end.join("\n").html_safe
      end