routes.rb

resources :products

prodcuts_controller_decorator.rb

Spree::ProductsController.class_eval do
  before_filter :authenticate_spree_user!,:except => [:show,:index]


  def new
    @product = current_user.products.build
  end

end

products_controller_spec.rb

require 'spec_helper'
describe Spree::ProductsController do
  let(:user) {create(:user)}

    before(:each) do
      Spree::Core::Engine.routes
      BigPlanet::Application.routes
      controller.stub :spree_current_user => user
    end

    it "render new template" do
      get :new
      response.should render_template(:new)
    end

  end
end

但它使用原始的Spree :: Controller并给出

Failure/Error: get :new
ActionController::RoutingError:
No route matches {:controller=>"spree/products",:action=>"new"}

如果有人能把我推向正确的方向,那就太好了.