gistfile1.txt

import {
  inject,
  TestBed
} from '@angular/core/testing';

import { AppComponent } from './app.container';
import { AppSandbox } from '../../core.sandbox';
import { Observable } from 'rxjs/Observable';

describe('App', () => {
  beforeEach(() => TestBed.configureTestingModule({
    providers: [
      { provide: AppSandbox, useValue: {
        checkAuthentication: () => {},
        currentUser$: Observable.of({}),
        isLoading: Observable.of({})}
      },
      AppComponent
    ]}));

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

  it('should call AppSandbox.checkAuthentication on init', inject([
    AppComponent,
    AppSandbox
  ], (component: AppComponent, sb: AppSandbox) => {
    spyOn(sb, 'checkAuthentication').and.stub();

    component.ngOnInit();

    expect(sb.checkAuthentication).toHaveBeenCalled();
  }));

});