在比较异步函数内部的数据时，Angular HttpClient单元测试不会失败

import { TestBed, async } from '@angular/core/testing';
import { HttpClientTestingModule, HttpTestingController } from '@angular/common/http/testing';
import { DataService } from './data.service';

describe('DataService', () => {
  let service: DataService;
  let httpMock: HttpTestingController;

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [HttpClientTestingModule],
      providers: [DataService]
    });
    service = TestBed.inject(DataService);
    httpMock = TestBed.inject(HttpTestingController);
  });

  afterEach(() => {
    httpMock.verify();
  });

  it('should compare data in async function', async(() => {
    const expectedData = { id: 1, name: 'John' };

    service.getData().subscribe(data => {
      expect(data).toEqual(expectedData);
    });

    const req = httpMock.expectOne('api/data');
    expect(req.request.method).toBe('GET');
    req.flush(expectedData);
  }));
});