Imported RouterTestingModule in AppComponent specs as per angular/angular-cli#3252

Author: amercier

src/app/app.component.spec.ts

@@ -1,11 +1,16 @@
 import { TestBed, async } from '@angular/core/testing';
+import { RouterTestingModule } from '@angular/router/testing';
 import { AppComponent } from './app.component';
+
 describe('AppComponent', () => {
   beforeEach(async(() => {
     TestBed.configureTestingModule({
       declarations: [
         AppComponent
       ],
+      imports: [
+        RouterTestingModule
+      ]
     }).compileComponents();
   }));
   it('should create the app', async(() => {