Ruby on rails 控制器规范使用ActionController:：RoutingError和get方法失败

我正在构建一个Rails 3应用程序，我对控制器规范有点困惑。下面是我在应用程序中的内容：

routes.rb 用户\u controller.rb 此示例未运行，并显示以下错误

Failure/Error: get :library,:parameters => {:user_name => user.user_name}
ActionController::RoutingError:
    No route matches {:parameters=>{:user_name=>"UserName"}, :controller=>"users", :action=>"library"}

---

去掉

：参数

键进入

Get

：

get :library, :user_name => user.user_name

describe "UsersController" do
    describe "#library" do
        let(:user){FactoryGirl.create(:user)}
        it "renders the users/library.html.erb view" do
            get :library, :parameters => {:user_name => user.user_name}
        end
    end
end

Failure/Error: get :library,:parameters => {:user_name => user.user_name}
ActionController::RoutingError:
    No route matches {:parameters=>{:user_name=>"UserName"}, :controller=>"users", :action=>"library"}

get :library, :user_name => user.user_name