docs: fix unit tests in toh-pt6 (#24491)

Resolves #20373

PR Close #24491

aio/content/examples/toh-pt6/src/app/dashboard/dashboard.component.spec.ts

@@ -1,16 +1,36 @@
 import { async, ComponentFixture, TestBed } from '@angular/core/testing';
 
 import { DashboardComponent } from './dashboard.component';
+import { HeroSearchComponent } from '../hero-search/hero-search.component';
+
+import { RouterTestingModule } from '@angular/router/testing';
+import { of } from 'rxjs';
+import { HEROES } from '../mock-heroes';
+import { HeroService } from '../hero.service';
 
 describe('DashboardComponent', () => {
   let component: DashboardComponent;
   let fixture: ComponentFixture<DashboardComponent>;
+  let heroService;
+  let getHeroesSpy;
 
   beforeEach(async(() => {
+    heroService = jasmine.createSpyObj('HeroService', ['getHeroes']);
+    getHeroesSpy = heroService.getHeroes.and.returnValue( of(HEROES) );
     TestBed.configureTestingModule({
-      declarations: [ DashboardComponent ]
+      declarations: [
+        DashboardComponent,
+        HeroSearchComponent
+      ],
+      imports: [
+        RouterTestingModule.withRoutes([])
+      ],
+      providers: [
+        { provide: HeroService, useValue: heroService }
+      ]
     })
     .compileComponents();
+
   }));
 
   beforeEach(() => {
@@ -22,4 +42,17 @@ describe('DashboardComponent', () => {
   it('should be created', () => {
     expect(component).toBeTruthy();
   });
+
+  it('should display "Top Heroes" as headline', () => {
+    expect(fixture.nativeElement.querySelector('h3').textContent).toEqual('Top Heroes');
+  });
+
+  it('should call heroService', async(() => {
+    expect(getHeroesSpy.calls.any()).toBe(true);
+    }));
+
+  it('should display 4 links', async(() => {
+    expect(fixture.nativeElement.querySelectorAll('a').length).toEqual(4);
+  }));
+
 });

aio/content/examples/toh-pt6/src/app/hero-search/hero-search.component.spec.ts

@@ -1,14 +1,18 @@
 import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { RouterTestingModule } from '@angular/router/testing';
+import { HttpClientTestingModule } from '@angular/common/http/testing';
 
 import { HeroSearchComponent } from './hero-search.component';
 
+
 describe('HeroSearchComponent', () => {
   let component: HeroSearchComponent;
   let fixture: ComponentFixture<HeroSearchComponent>;
 
   beforeEach(async(() => {
     TestBed.configureTestingModule({
-      declarations: [ HeroSearchComponent ]
+      declarations: [ HeroSearchComponent ],
+      imports: [RouterTestingModule.withRoutes([]), HttpClientTestingModule]
     })
     .compileComponents();
   }));

aio/content/examples/toh-pt6/src/app/heroes/heroes.component.spec.ts

@@ -1,6 +1,7 @@
 import { async, ComponentFixture, TestBed } from '@angular/core/testing';
-
+import { RouterTestingModule } from '@angular/router/testing';
 import { HeroesComponent } from './heroes.component';
+import { HttpClientTestingModule } from '@angular/common/http/testing';
 
 describe('HeroesComponent', () => {
   let component: HeroesComponent;
@@ -8,7 +9,8 @@ describe('HeroesComponent', () => {
 
   beforeEach(async(() => {
     TestBed.configureTestingModule({
-      declarations: [ HeroesComponent ]
+      declarations: [ HeroesComponent ],
+      imports: [RouterTestingModule.withRoutes([]), HttpClientTestingModule],
     })
     .compileComponents();
   }));