add test for ActionController#render_to_string

test/dummy/app/assets/javascripts/application.js

@@ -4,6 +4,4 @@
 // It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
 // the compiled file.
 //
-//= require jquery
-//= require jquery_ujs
 //= require_tree .

test/dummy/app/controllers/pdf_controller.rb

@@ -1,10 +1,9 @@
 class PdfController < ApplicationController
 
   def render_pdf
-    @items=[{:name=> "Hello"},{:name=> "World"}]
+   @items = [{:name=> "Hello"},{:name=> "World"}]
    render "render_pdf.pdf.prawn"
   end
 
 
-
 end

test/dummy/app/views/pdf/render_pdf.pdf.prawn

@@ -1,7 +1,7 @@
-prawn_document do |pdf|
+prawn_document(page_layout: :portrait) do |pdf|
   pdf.text "Hello There :D"
   pdf.text "now it is here: #{pdf.cursor}"
-  pdf.text "ITems are #{@items.inspect}"
+  pdf.text "Items are #{@items.inspect}"
   pdf.font("Courier") do
     pdf.text "Written in Courier because we are inside the block."
   end

test/dummy/test/unit/render_to_string_test.rb

@@ -0,0 +1,10 @@
+require 'test_helper'
+require 'pdf/reader'
+
+class RenderToStringTest < ActiveSupport::TestCase
+
+  test "should render_to_string" do
+    ApplicationController.new.render_to_string("pdf/render_pdf.pdf", locals: {'@items' => []})
+  end
+
+end