anchor.diff:  
       [测试带有输入属性和输出属性的组件](#component-with-input-output)
   
  -
       * [Test _DashboardHeroComponent_ stand-alone](#dashboard-standalone)
   
         [单独测试`DashboardHeroComponent`](#dashboard-standalone)
  
positive.code: 
      [测试带有异步服务的组件](#component-with-async-service)
  
  
      * [Spying on the real service](#service-spy)
  
        [监听真实的服务](#service-spy)
  
negative.code:   * [Test a _RouterOutlet_ component](#router-outlet-component)
  
      [测试`RouterOutlet`组件](#router-outlet-component)
  
      * [Stubbing unneeded components](#stub-component)
      
  