测试嵌套索引控制器操作

Question

我的路线文件如下所示：

resources :people do
  resources :text_messages, only: [:index, :new, :create]
end

我的/app/controllers/text_messages_controllers.rb看起来像：

class TextMessagesController < ApplicationController
  def index
    puts 'You have reached the index controller'
    @messages = Message.all
  end
end

这是/spec/controllers/text_messages_controller_spec.rb

describe TextMessagesController do
  describe 'GET #index' do
    it 'shows all the messages to that user' do
      person = create(:person)
      message = create(:message, person: person)

      get :index, person_id: person.id

      expect(assigns(:messages)).to include(message)
    end
  end
end

然而，当我运行测试时，它失败说@messages为零并且不打印文本。为什么此测试未达到控制器操作？当我访问网址时，它在开发方面效果很好。