+import { Observable, of } from 'rxjs';
+import { Hero } from '../hero';
+import { HEROES } from '../mock-heroes';
+import { HeroService } from '../hero.service';
+import { MessageService } from '../message.service';
+
+class MockHeroService {
+ getHeroes() : Observable<Hero[]> {
+ return of(HEROES);
+ }
+}
+
+class MockMessageService {}
+