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I didn't have to migrate tests over since I was started with a fresh project in Angular 2.

Angular Router does allow nested states: - https://angular.io/docs/ts/latest/guide/router.html - https://angular.io/docs/ts/latest/api/router/index/Router-cl...

I don't quite recall what "targetted views" mean?

I think targeted views means multiple <router-outlet>s, which it does appear to support:

> A template may hold exactly one unnamed <router-outlet>. The router supports multiple named outlets, a feature we'll cover in future.

About testing: e2e test will take almost 0 efforts to migrate, unit-tests will be rewritten completely (although your code too, so nothing wrong with it).

Should be noted that UI-router supports ng2 as well (and React!)