Javascript 角度单元测试：如何在ngOnInIt（）中进行单元测试订阅？

待测试部件：

export class ComponentDetailsComponent implements OnInit {
     ngOnInit() {

            this.componentDetailsService.currentProperties.subscribe((data) => {
                this.loader.hideLoader();    
                 this.showPopup = data.showPopup;
         .....more code....
    }

规格：

class ComponentDetailsServiceStub {
  defaultProperties ={       
    showToolbar: false,        
    showPopup: true, //show popup is set to true here       
    refresh: false,
  };

    propertiesSource = new BehaviorSubject(this.defaultProperties);
  currentProperties = this.propertiesSource.asObservable();

  setDefaultCancelClicked(){}
}


it('should set showPopup to correct value', () => {

    componentDetailsService.propertiesSource.next({         
      showToolbar: true,         
      showPopup: false, // show popup is set to false          
      refresh: false,

    }); 

    expect(subject.showPopup).toBe(true) ///this always passes

   });

---

你不必写那么多的步骤就可以通过了

import { of } from 'rxjs';
....

class ComponentDetailsServiceStub {
  defaultProperties ={       
    showToolbar: false,        
    showPopup: true, //show popup is set to true here       
    refresh: false,
  };
  currentProperties = of(defaultProperties); // will convert to Observable
  setDefaultCancelClicked(){}
}

您的测试用例可以是：

it('should set showPopup to correct value', () => {
    subject.ngOnInit(); // jasmine will internally call subscribe on stub service created and return the stub value assigned.
    expect(subject.showPopup).toBe(true);
   });

请给出一个答案；这是怎么联系起来的？我不会测试

showPopup

属性，我会测试弹出窗口是否显示。此外，您可能需要一个

检测更改
。