jquery - Angular 5 : How to import jQuery in Jest test?

Question

我有一个使用 CalendarService 的 Angular 组件。当组件初始化时，我调用“calendarService.init()”方法。

这个CalendarService设置了semantic-ui-calendar的配置(基于jQuery)，代码类似于“$(myElement).calendar(settings);”。

当我使用 Jest 测试我的组件时，组件的初始化出现错误:“ReferenceError: $未定义”。

我该如何修复它？

搜索.组件.spec.ts:

describe('SearchComponent', () => {

  let fixture: ComponentFixture<SearchComponent>;
  let component: SearchComponent;
  let element: DebugElement;

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [
        AppModule
      ],
      providers: [
        { provide: APP_BASE_HREF, useValue : '/search' },
        CalendarService
      ]
    });

    fixture = TestBed.createComponent(SearchComponent);

    let calendarService = TestBed.get(CalendarService);

    component = fixture.componentInstance;
    element = fixture.debugElement;

    fixture.detectChanges();
  }));
});

搜索.component.ts:

@Component({
  selector: 'afo-search',
  templateUrl: './search.component.html',
  styleUrls: ['./search.component.less']
})
export class SearchComponent implements OnInit, AfterViewInit {

  constructor(private calendarService: CalendarService) { }

  ngOnInit() {
  }

  ngAfterViewInit() {
    this.calendarService.init();
  }

}

日历.service.ts:

@Injectable()
export class CalendarService {

  constructor() {
  }

  init() {
    $('.ui.calendar.field').calendar();
  }
}

Answer 1

我找到了解决方案:

我需要在 setupJest.ts 中添加以下行:

import * as $ from 'jquery';
Object.defineProperty(window, '$', {value: $});
Object.defineProperty(global, '$', {value: $});
Object.defineProperty(global, 'jQuery', {value: $});

一开始，我尝试了这个解决方案:

import $ from 'jquery';
window.$ = $;
global.$ = global.jQuery = $;

但是 global.xxx 和 window.xxx 未知。

参见:

https://github.com/thymikee/jest-preset-angular#allow-vendor-libraries-like-jquery-etc

https://github.com/facebook/jest/issues/708