ruby-on-rails-3 – RSpec 2：使用rspec-rails的’route_to’上

require 'spec_helper'

describe HomeController do

  describe 'boilerplate routes' do

    it "should route to '/about'" do
      { :get => "/about" }.should route_to(:controller => 'home',:action => 'show')
    end

  end

end

…并且它一直失败与此错误消息：

1) HomeController boilerplate routes should route to '/about'
Failure/Error: { :get => "/about" }.should route_to(:controller => 'home',:action => 'show')
   NoMethodError:
      undefined method `route_to' for #<RSpec::Core::ExampleGroup::Nested_1::Nested_1:0x00000101499650>
   # ./spec/routes/home_routes_spec.rb:8:in `block (3 levels) in <top (required)>'

我正在使用rspec-rails 2.5.0与rails 3.0.5& rspec 2.5.1.

我正在做我的代码,就像rdocs中所说的,试图跟着this example code …我做错了什么？帮帮我！