组件方法中的Angular - Mock订阅

import { of } from 'rxjs';

// 模拟一个HTTP请求的返回结果
const mockResponse = { data: 'Mock data' };

// 创建一个Mock订阅
const mockSubscription = of(mockResponse).subscribe(response => {
  // 处理返回结果
  console.log(response);
});

// 取消订阅
mockSubscription.unsubscribe();

import { TestBed } from '@angular/core/testing';
import { DataService } from './data.service';

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

  beforeEach(() => {
    TestBed.configureTestingModule({});
    service = TestBed.inject(DataService);
  });

  it('should get data', () => {
    const mockResponse = { data: 'Mock data' };

    // 使用spyOn方法模拟getData方法，并返回一个Mock订阅
    spyOn(service, 'getData').and.returnValue(of(mockResponse));

    // 调用getData方法，并断言返回结果是否正确
    service.getData().subscribe(response => {
      expect(response).toEqual(mockResponse);
    });
  });
});