RSpec控制器测试无法通过简单路由

Question

This is probably a very basic error, but I am still learing. =)

My routes.rb consists only of

WebPortal::Application.routes.draw do
  resources :categories
end

If I understand this correctly, this should (among others) map /categories to CategoriesController.index . This controller looks like

class CategoriesController < ApplicationController
  def index
  end
end

The corresponding view file exists, and rails server serves this page fine. But my RSpec test

describe CategoriesController do
  describe "GET :index" do
    it "should be succesful" do
      get :index
      response.should be_succes
    end
  end
end

fails with the message

Failure/Error: get :index
    ActionController::RoutingError:
    No route matches {:controller=>"categories"}

What am I doing wrong here?

Edit:

The command rake routes gives

 rake routes
   categories GET    /categories(.:format)          {:action=>"index", :controller=>"categories"}
              POST   /categories(.:format)          {:action=>"create", :controller=>"categories"}
 new_category GET    /categories/new(.:format)      {:action=>"new", :controller=>"categories"}
edit_category GET    /categories/:id/edit(.:format) {:action=>"edit", :controller=>"categories"}
     category GET    /categories/:id(.:format)      {:action=>"show", :controller=>"categories"}
              PUT    /categories/:id(.:format)      {:action=>"update", :controller=>"categories"}
              DELETE /categories/:id(.:format)      {:action=>"destroy", controller=>"categories"}

Answer 1

I was using RSpec version 2.6.1 because I used the Gemfile from the rails tutorial at http://ruby.railstutorial.org/ . Switching to version 2.7 fixed my problem.