Jasmine angular 单元测试 BehaviorSubject

Question

我有这样的服务

日历域.service.ts

@Injectable()
export class CalendarDomainService {
  private _calendarWeek = new BehaviorSubject<CalendarWeekTo | null>(null);
  get calendarWeek$(): Observable<CalendarWeekTo | null> {
    return this._calendarWeek.asObservable();
  }

  setCalendarWeek(calendarWeek: CalendarWeekTo): void {
    this._calendarWeek.next(calendarWeek);
  }
}

像这样的单元测试

日历域.service.spec.ts

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

import { CalendarDomainService } from './calendar-domain.service';

describe('CalendarDomainService', () => {
    let service: CalendarDomainService;

    beforeEach(() => {
        TestBed.configureTestingModule({
            providers: [CalendarDomainService],
            schemas: [CUSTOM_ELEMENTS_SCHEMA, NO_ERRORS_SCHEMA]
        });
        service = TestBed.inject(CalendarDomainService);
    });

    it('should be created', () => {
        expect(service).toBeTruthy();
    });
});

如您所见，我没有测试这两个 function，因为老实说我什至不知道如何开始测试，关于如何开始的任何信息，谢谢

Answer 1

您可以在测试本身上使用完成的回调并正常订阅主题。

it('Should emit next value of the week', (done)=>{
   service.setCalendarWeek(<yourvaluehere>);
   service.calendarWeek$.subscribe(v=> {
     expect(v).toBe(<yourvaluehere>)
     done();
   });
});