Testing router functionality of a component

app.component.spec.ts

/* tslint:disable:no-unused-variable */

import { addProviders, async, inject, getTestInjector } from '@angular/core/testing';
import { provideRouter } from '@angular/router';
import { createPlatform, PlatformRef, EventEmitter } from '@angular/core';
import { LocationStrategy } from '@angular/common';
import { SpyLocation } from '@angular/common/testing';
import { AppComponent } from './app.component';
import { ObservableWrapper } from '@angular/core/src/facade/async';

const routes = [];

class MockLocationStrategy extends SpyLocation {
    internalBaseHref:string = '/';
    /** @internal */
    _subject:EventEmitter<any> = new EventEmitter();

    constructor() {
        super();
    }

    pushState(ctx:any, title:string, path:string, query:string):void {
        this.go(path, query);
    }

    onPopState(fn:(value:any) => void):void {
        ObservableWrapper.subscribe(this._subject, fn);
    }

    getBaseHref():string {
        return this.internalBaseHref;
    }
}

describe('App: Testapp', () => {
  beforeEach(() => {
    addProviders([
      provideRouter(routes),
      { provide: LocationStrategy, useClass: MockLocationStrategy },
      AppComponent
    ]);
    try {
      getTestInjector().get(PlatformRef);
    } catch (error) {
      console.log('have to create platform');
      createPlatform(getTestInjector());
    }
  });

  it('should create the app',
    inject([AppComponent], (app: AppComponent) => {
      expect(app).toBeTruthy();
    }));

  it('should have as title \'app works!\'',
    inject([AppComponent], (app: AppComponent) => {
      expect(app.title).toEqual('app works!');
    }));
});

app.component.ts

import { Component } from '@angular/core';
import { Router } from '@angular/router';

@Component({
  moduleId: module.id,
  selector: 'app-root',
  templateUrl: 'app.component.html',
  styleUrls: ['app.component.css']
})
export class AppComponent {
  title = 'app works!';
  currentNav: any;

  constructor(router:Router) {
  	router.events.subscribe((event) => {
  		this.currentNav = event;
  	});
  }
}

These are the changed files of an angular CLI 1.0.0-beta.10 created angular2 RC4 project.

The first test will fail with "Bootstrap at least one component before injecting Router." Why?

The second test will fail with "There can be only one platform. Destroy the previous one to create a new one."
What is really strange because the first test created a platform but the get in the second test fails.

I'm not interested in mocking the router because I will need to rely on the router functions for further tests.