如何在angular中将报头与httpclient间谍进行比较

import { HttpClientTestingModule, HttpTestingController } from '@angular/common/http/testing';
import { TestBed } from '@angular/core/testing';
import { HttpClient, HttpHeaders } from '@angular/common/http';

beforeEach(() => {
  TestBed.configureTestingModule({
    imports: [HttpClientTestingModule],
    providers: [YourService] // 如果你的请求是在服务中发起的
  });

  httpClient = TestBed.inject(HttpClient);
  httpTestingController = TestBed.inject(HttpTestingController);
});

it('should compare headers with HttpClient spy', () => {
  const expectedHeaders = new HttpHeaders({ 'Content-Type': 'application/json' });

  // 发起请求
  httpClient.get('/api/data').subscribe();

  // 捕获请求并进行断言
  const req = httpTestingController.expectOne('/api/data');
  expect(req.request.headers).toEqual(expectedHeaders);

  // 返回模拟的响应
  req.flush({ data: 'test' });

  // 确保没有其他未处理的请求
  httpTestingController.verify();
});