Angular:测试是否执行了EventEmitter订阅回调

import { ComponentFixture, TestBed } from '@angular/core/testing';
import { MyComponent } from './my.component';

describe('MyComponent', () => {
  let component: MyComponent;
  let fixture: ComponentFixture<MyComponent>;

  beforeEach(async () => {
    await TestBed.configureTestingModule({
      declarations: [ MyComponent ]
    })
    .compileComponents();
  });

  beforeEach(() => {
    fixture = TestBed.createComponent(MyComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

  // 测试代码将放在这里
});

it('should execute the EventEmitter subscription callback', () => {
  // 创建一个spy来监视EventEmitter的订阅回调
  const callbackSpy = spyOn(component.myEvent, 'subscribe');

  // 执行一些操作，导致EventEmitter触发订阅回调
  // 例如，调用一个方法或模拟用户交互

  // 断言订阅回调已被执行
  expect(callbackSpy).toHaveBeenCalled();
});