import { TestBed , async } from '@angular/core/testing' ; import { AppComponent } from './app.component' ; import { HttpClientModule } from '@angular/common/http' ; import { AppConfigService } from './app-config.service' ; describe ( 'AppComponent' , ( ) => { let service ; beforeEach ( async ( ( ) => { TestBed . configureTestingModule ( { imports : [ HttpClientModule ] , declarations : [ AppComponent ] } ) . compileComponents ( ) ; service = TestBed . get ( AppConfigService ) ; service . data . title = 'Test App' ; } ) ) ; it ( 'should create the app' , async ( ( ) => { const fixture = TestBed . createComponent ( AppComponent ) ; const app = fixture . debugElement . componentInstance ; expect ( app ) . toBeTruthy ( ) ; } ) ) ; it ( 'should render title in a h1 tag' , async ( ( ) => { const fixture = TestBed . createComponent ( AppComponent ) ; fixture . detectChanges ( ) ; const compiled = fixture . debugElement . nativeElement ; expect ( compiled . querySelector ( 'h1' ) . textContent ) . toContain ( 'Welcome to Test App!' ) ; } ) ) ; } ) ;