测试组件 - 测试异步操作

import { QuoteComponent } from './quote.component';
import { provide } from '@angular/core';
import {
  async,
  TestBed,
  fakeAsync,
  tick,
} from '@angular/core/testing';
class MockQuoteService {
  public quote: string = 'Test quote';
  }
}
describe('Testing Quote Component', () => {
  let fixture;
  beforeEach(() => {
    TestBed.configureTestingModule({
      declarations: [
        QuoteComponent
      ],
      ]
    });
    fixture = TestBed.createComponent(QuoteComponent);
    fixture.detectChanges();
  });
  it('Should get quote', fakeAsync(() => {
    fixture.componentInstance.getQuote();
    tick();
    fixture.detectChanges();
    const compiled = fixture.debugElement.nativeElement;
    expect(compiled.querySelector('div').innerText).toEqual('Test quote');