如何在angular 9中测试带参数的http.post请求？

// my-service.service.ts
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class MyService {
  constructor(private http: HttpClient) {}

  postData(data: any): Observable<any> {
    return this.http.post('/api/data', data);
  }
}

// my-service.service.spec.ts
import { TestBed } from '@angular/core/testing';
import { HttpClientTestingModule, HttpTestingController } from '@angular/common/http/testing';
import { MyService } from './my-service.service';

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

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

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

  it('should post data to the server', () => {
    const dummyData = { key: 'value' };
    const expectedResponse = { success: true };

    service.postData(dummyData).subscribe(response => {
      expect(response).toEqual(expectedResponse);
    });

    const req = httpMock.expectOne('/api/data');
    expect(req.request.method).toBe('POST');
    expect(req.request.body).toEqual(dummyData);

    req.flush(expectedResponse);
  });
});