角茉莉花测试抽象类与其他抽象类

Question

我有这个场景问题：

在 Ionic/Angular 项目（ionic v3/Angular v5）中，我有组件 SuppliedVanContainerComponent，它扩展了抽象类 AbstractLoadingClass，而这个类扩展了另一个抽象类 AbstractSubscriberClass.

AbstractLoadingClass 使用LoadingController 一个离子角度服务来显示微调器，并在调用 showLoading 方法时由 SuppliedVanContainerComponent 使用。

问题：当我可以对 jasmine 使用单元测试时，它会显示这些错误：

TypeError: Cannot read properties of undefined (reading '_getPortal')

当我用 jasmine.createSpyObj 模拟 LoadingController 时，它显示了另一个错误并且是：

TypeError: this.loading.present 不是函数

我该如何修复它或者我可以使用抽象类进行测试？

SuppliedVanContainerComponent

    export class SuppliedVanContainerComponent extends AbstractLoadingClass
      constructor(loadingCtrl: LoadingController) {
            super(loadingCtrl);
        }

      ngOnInit(){
        this.showLoading();
      }

AbstractLoadingClass

import {Loading, LoadingController} from 'ionic-angular';
import {LoadingOptions} from 'ionic-angular/umd/components/loading/loading-options';

import {AbstractSubscriberClass} from './abstract-subscriber.class';

export abstract class AbstractLoadingClass extends AbstractSubscriberClass {
  private loading: Loading;
  
  protected constructor(public loadingCtrl: LoadingController) {
    super();
  }
  
  private getCreateLoading(opts?: LoadingOptions) {
    return this.loadingCtrl.create(opts);
  }
  
  showLoading() {
    this.loading = this.getCreateLoading({content: ''});
    this.loading.present();
    this.loading.setContent('');
  }

  hideLoading() {
    this.loading.dismiss();
  }
}

茉莉花测试出错

...
  let fakeLoadingController = jasmine.createSpyObj<LoadingController>('LoadingController', {
    create: {content: ''},
  })
...
{provide: LoadingController, useValue: fakeLoadingController},

错误：

Answer 1

感谢@AliF50，我有两个解决方案，我发布了， 第一个解决方案：

....
let fakeLoadingController = jasmine.createSpyObj<LoadingController>('LoadingController', ['create'])
......
providers: [
....
   {provide: LoadingController, useValue: fakeLoadingController},
]
....
beforeEach(() => {
    fixture = TestBed.createComponent(SuppliedVanContainerComponent);
    fakeLoadingController.create.and.returnValue({present: () => null, setContent: () => null, dismiss: () => null});
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

而且它的工作方式非常简单，无需使用 LoaderController 进行间谍或测试（只是模拟）。

如果您要使用 Loading 和 spy ，请在此模式下设置：

.....
  let fakeLoadingController = jasmine.createSpyObj<LoadingController>('LoadingController', ['create'])
  let fakeLoadingObject = jasmine.createSpyObj<Loading>('Loading', ['present', 'setContent', 'dismiss']);
.....
providers: [
...
        {provide: LoadingController, useValue: fakeLoadingController},
        {provide: Loading, useValue: fakeLoadingObject},
]
....
  beforeEach(() => {
    fixture = TestBed.createComponent(SuppliedVanContainerComponent);
    dailyReportsModel = TestBed.get(DailyReportsModel);
    fakeLoadingController.create.and.returnValue(fakeLoadingObject);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });
  ....
  it('test fakeLoadingObject', () => {
    expect(fakeLoadingObject.present).toHaveBeenCalled();
  })

感谢@AliF50

Answer 2

我认为你在嘲笑它不正确，试试这个：

let fakeLoadingController = jasmine.createSpyObj<LoadingController>('LoadingController', ['create']);
...
{provide: LoadingController, useValue: fakeLoadingController},
...
// before fixture = ..., add this line
fakeLoadingController.create.and.returnValue({ present: () => null, setContent: () => null, dismiss: () => null });
// Or if you want spies on present, setContent, dismiss, you could do
let fakeLoadingObject = jasmine.createSpyObj<any>('FakeLoadingObject', ['present', 'setContent', 'dismiss']);
// then the line above becomes
fakeLoadingController.create.and.returnValue(fakeLoadingObject);
// And then you should have a handle of something like this:
expect(fakeLoadingObject.present).toHaveBeenCalled();