posts_controller_nested_spy.rb

describe PostsController, "on GET show" do
  before(:each) do
    @post = stub('a post', :to_param => '1')
    Post.stubs(:find => @post)

    get :show, :id => @post.to_param
  end

  it { should render_template(:show) }

  it "should find and assign the given post" do
    Post.should have_received(:find).with(@post.to_param)
    should assign_to(:post).with(@post)
  end
end