angular - How to unit test router in Angular2 RC5? -

below appcomponent code:

import { component } '@angular/core';  @component({   selector: 'demo-app',   template: `<h1>angular 2 app</h1>     <a [routerlink]="['/']">home</a>     <a [routerlink]="['/about']">about</a>     <a [routerlink] = "['/login']">sign in</a>     <div class="outer-outlet">       <router-outlet></router-outlet>     </div>   ` }) export class appcomponent { } 

i tried find in google found router testing in lower angular version <5. appreciated.