如何使用量角器jasmine处理angular应用程序的不一致等待问题

npm install jasmine --save-dev

import { TestBed, ComponentFixture, fakeAsync, tick } from '@angular/core/testing';
import { AppComponent } from './app.component';

describe('AppComponent', () => {
  let component: AppComponent;
  let fixture: ComponentFixture<AppComponent>;

  beforeEach(async () => {
    await TestBed.configureTestingModule({
      declarations: [AppComponent]
    }).compileComponents();
  });

  beforeEach(() => {
    fixture = TestBed.createComponent(AppComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

  it('should create the app', () => {
    expect(component).toBeTruthy();
  });

  it('should display welcome message', fakeAsync(() => {
    expect(component.message).toBe('');
    component.loadMessage();
    tick(1000); // 等待1秒钟
    fixture.detectChanges();
    expect(component.message).toBe('Welcome!');
  }));
});

ng test