Cannot match any routes. URL Segment: '': When trying to use child routes and Ng2

I have the following plunker, which does not work. In order to get it to work I can comment out...

RouterModule.forRoot([
{
path: "",
component: TestComponent,
children: [
// {
// path:"",
// outlet: "other",
// component: TestComponent
// }
]
}
])


If I don't do that I get...

EXCEPTION: Uncaught (in promise): Error: Cannot match any routes. URL Segment: ''
Error: Cannot match any routes. URL Segment: ''


How do I add a child route?

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