.F....

1)
'CommentsController CommentsController handling create a comment is invalid should render the posts show template' FAILED
Expected template "posts/show" to be rendered, got no render
./spec/controllers/comments_controller_spec.rb:64:

------

require File.expand_path(File.dirname(__FILE__) + '/../spec_helper')

describe CommentsController do
  describe CommentsController, " handling create" do

    before(:each) do
      @comment = mock_model(Comment).as_null_object

      @post = mock_model(Post, :save => nil).as_null_object
      @post.comments.stub!(:build).and_return(@comment)
      Post.stub!(:find_by_permalink).and_return(@post)

      @params = {'author_name' => 'Joe User', 'author_email' => 'joe@user.org', 'body' => 'My comment!'}
    end


    def post_with_valid_comment
      post :create, :comment => {'author_name' => 'Joe User', 'author_email' => 'joe@user.org', 'body' => 'My comment!'}
    end


    def post_with_invalid_comment
      post :create, :comment => {'author_email' => 'joe@user.org', 'body' => 'My comment!'}
    end


    it "should build a new comment" do
      @post.comments.should_receive(:build).with(@params).and_return(@comment)
      post_with_valid_comment
    end


    context "a comment is valid" do

      it "should save the comment" do
        @comment.should_receive(:save).and_return(true)
        post_with_valid_comment
      end


      it "should set the flash message" do
        post_with_valid_comment
        flash[:notice].should == 'Comment successfully added!'
      end


      it "should redirect back to the post page" do
        post_with_valid_comment
        response.should redirect_to(post_path(@post))
      end
    end


    context "a comment is invalid" do

      it "should not save the comment" do
        @comment.should_receive(:save).and_return(false)
        post_with_invalid_comment
      end


      it "should render the posts show template" do
        post_with_invalid_comment
        response.should render_template('posts/show')
      end
    end

  end
end



--------------------


class CommentsController < ApplicationController

  before_filter :set_post

  def create
    @comment = @post.comments.build(params[:comment])

    if @comment.save
      flash[:notice] = 'Comment successfully added!'
      redirect_to post_path(@post)
    else
      render :template => 'posts/show'
    end
  end



  private


  def set_post
    @post = Post.find_by_permalink(params[:post_id])
  end
end