title: Test flash notice in layout view spec (rspec2, rails3)
body: <p>I'd like to spec the fact that my application layout view prints out flash notices. However the following code does not run, the <code>flash</code> method does not exist in view specs (as opposed to controller specs where it works perfectly):</p>
  
  <pre><code>describe 'layouts/application' do
    it "renders flash notices" do
      flash[:notice] = "This is a notice!"
      render
      response.should contain "This is a notice!"
    end
  end
  </code></pre>
  
  <p>Is my code wrong or is it a "not-yet-implemented feature" in Rspec 2? I'm on Rails3 and Rspec2 from its master branch on Git.</p>
  
  <p>Thanks!</p>