在angular 2单元测试中使用Http

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

beforeEach(async(() => {
  TestBed.configureTestingModule({
    imports: [HttpClientTestingModule],
    providers: [YourService] // 如果有使用到自定义的服务，需要在这里提供
  }).compileComponents();
}));

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

it('should make a GET request', inject([HttpClient, HttpTestingController], (http: HttpClient, httpTestingController: HttpTestingController) => {
  const testData = { message: 'Hello, World!' };

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

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

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