How do I test the title of a page from an RSpec view spec?

I'm l开发者_JAVA技巧earning RSpec 2 with Rails 3. In order to set the contents of the tag in the layout for each page, I have a helper that can be used to set the title and then return it:

def page_title(subtitle=nil)
  if @title.nil?
    @title = ["Site Name"]
  end

  unless subtitle.nil?
    @title << subtitle
  end

  @title.reverse.join " - "
end

The helper is called from both the layout, where it returns the title, and the individual views, where it sets the title. Now, I want to test in the view specs that the title is being set correctly. Since the layout is not rendered, I have decided to call page_title from the spec and check that the return value is what I expect it to be. However, this doesn't work, and always just returns "Site Name". What should I do?

---

To check the title of a page in a view spec try:

require "spec_helper"

describe "controller/view.html.erb" do
  it "renders page title with 'Title | MySite'" do
    render template: "controller/view", layout: "layouts/application"
    rendered.should have_selector("title", text: "Title | MySite")
  end
end

Because render is being called outside of the controller, it needs to be told about the layout.

---

I'm not sure if this is what you meant, but you could test the layout directly:

require 'spec_helper'
include ApplicationHelper

describe "layouts/application" do
  it "should add subtitle to page title" do
    page_title("Subtitle")
    render
    rendered.should have_selector('title:contains("Subtitle - Site Name")')
  end
end

EDIT

You could also test that the page_title method is called in the view:

describe "mycontroller/index" do
  it "should set subtitle" do
    view.should_receive(:page_title).with("Subtitle")
    render
  end
end

or you could use a controller test with render_views:

describe Mycontroller do
  render_views
  it "sets the page title" do
    get :index
    response.body.should contain("Subtitle - Site Name")
  end
end