这是spec / controllers / movies_controller_spec.rb中的测试代码段

describe MoviesController do
   describe 'update' do                                                        
      it 'should call the model method to look up the movie to update' do                                          
        Movie.should_receive(:find).with("3")         
        put :update,{:id => "3"}                                             
     end
   end

这是controllers / movies_controller.rb中的控制器方法：

def update
   Movie.find(params[:id])
end

我遇到了这个问题：

1) MoviesController update should call the model method to look up the movie to update Failure/Error: post :update,{:id => "3"} ActionView::MissingTemplate: Missing template movies/update,application/update with {:handlers=>[:erb,:builder,:coffee,:haml],:formats=>[:html],:locale=>[:en,:en]}. Searched in: * "#<RSpec::Rails::ViewRendering::EmptyTemplatePathSetDecorator:0xa65b300>" # ./spec/controllers/movies_controller_spec.rb:8:in `block (3 levels) in <top (required)>'

我的路线看起来像：

movies GET    /movies(.:format)          {:action=>"index",:controller=>"movies"}
           POST   /movies(.:format)          {:action=>"create",:controller=>"movies"}
 new_movie GET    /movies/new(.:format)      {:action=>"new",:controller=>"movies"}
edit_movie GET    /movies/:id/edit(.:format) {:action=>"edit",:controller=>"movies"}
     movie GET    /movies/:id(.:format)      {:action=>"show",:controller=>"movies"}
           PUT    /movies/:id(.:format)      {:action=>"update",:controller=>"movies"}
           DELETE /movies/:id(.:format)      {:action=>"destroy",:controller=>"movies"}

谁能帮助我,告诉我在这么简单的例子中我到底做错了什么？