如何在angular2中模拟http.get

npm install @angular/common@latest @angular/compiler@latest @angular/core@latest @angular/forms@latest @angular/platform-browser@latest @angular/platform-browser-dynamic@latest @angular/router@latest @angular/animations@latest --save

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

describe('YourComponentOrService', () => {
  let httpClient: HttpClient;
  let httpTestingController: HttpTestingController;

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [HttpClientTestingModule],
      providers: [YourComponentOrService]
    });

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

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

  it('should simulate HTTP GET request', () => {
    const testData = { message: 'Hello, World!' };

    httpClient.get('/api/data').subscribe((data) => {
      expect(data).toEqual(testData);
    });

    const req = httpTestingController.expectOne('/api/data');
    expect(req.request.method).toEqual('GET');

    req.flush(testData);
  });
});