CdkDragDrop 单元测试事件

Question

所以，我一直在为我的 Angular 应用程序进行单元测试。我正在使用 Angular Material，并且我有一个使用拖放 CDK cdk 拖放 API 的组件。

html 代码看起来像这样

<mat-card class="interventionCard">
  <div  cdkDropListGroup class="container">
    <div cdkDropList
         [cdkDropListData]="interventionsTodo" (cdkDropListDropped)="drop($event)" class="dragContainer">
      <div class="dragInter" *ngFor="let i of interventionsTodo" cdkDrag><img src="{{i.imgSrc}}" class="interventionIc" alt=""></div>
      <a class="resetInv" (click)="reset()"><div class="dragInter"><img src="../assets/images/simulation-intervention/noIntervention.svg" class="interventionIc" alt=""></div></a><!---->
    </div>

    <div class="dropContainer">
      <div cdkDropList [cdkDropListData]="interventionsDoneNow" (cdkDropListDropped)="drop($event)" class="dropZone">
        <div class="dragInterDropped" *ngFor="let i of interventionsDoneNow" cdkDrag><img src="{{i.imgSrc}}" class="interventionIc" alt=""></div>
      </div>
        <div class="connectorL"></div>
      <div cdkDropList [cdkDropListData]="interventionsDonePlus5" (cdkDropListDropped)="drop($event)" class="dropZone">
        <div class="dragInterDropped" *ngFor="let i of interventionsDonePlus5" cdkDrag><img src="{{i.imgSrc}}" class="interventionIc"></div>
      </div>
      <div class="connectorL"></div>
      <div cdkDropList  [cdkDropListData]="interventionsDonePlus10" (cdkDropListDropped)="drop($event)" class="dropZone">
        <div class="dragInterDropped" *ngFor="let i of interventionsDonePlus10" cdkDrag><img src="{{i.imgSrc}}" class="interventionIc" alt=""></div>
      </div>
      <div class="connectorL"></div>
      <div cdkDropList  [cdkDropListData]="interventionsDonePlus15" (cdkDropListDropped)="drop($event)" class="dropZone">
        <div class="dragInterDropped" *ngFor="let i of interventionsDonePlus15" cdkDrag><img src="{{i.imgSrc}}" class="interventionIc" alt=""></div>
      </div>
      <div class="connectorL"></div>
      <div cdkDropList  [cdkDropListData]="interventionsDonePlus20" (cdkDropListDropped)="drop($event)" class="dropZone">
        <div class="dragInterDropped" *ngFor="let i of interventionsDonePlus20" cdkDrag><img src="{{i.imgSrc}}" class="interventionIc" alt=""></div>
      </div>
      <div class="connectorL"></div>
      <div cdkDropList  [cdkDropListData]="interventionsDonePlus25" (cdkDropListDropped)="drop($event)" class="dropZone">
        <div class="dragInterDropped" *ngFor="let i of interventionsDonePlus25" cdkDrag><img src="{{i.imgSrc}}" class="interventionIc" alt=""></div>
      </div>
      <div class="connectorL"></div>
      <div cdkDropList [cdkDropListData]="interventionsDonePlus30" (cdkDropListDropped)="drop($event)" class="dropZone">
        <div class="dragInterDropped" *ngFor="let i of interventionsDonePlus30" cdkDrag><img src="{{i.imgSrc}}" class="interventionIc" alt=""></div>
      </div>
    </div>

一切都很好，现在我有了调用该函数的 cdkDropListDroppet 事件 drop()

    drop(event: CdkDragDrop<{ imgSrc: string }[], any>) {
     if (event.previousContainer === event.container) {
       moveItemInArray(event.container.data, event.previousIndex, event.currentIndex);
     } else {
         if(event.container.data === this.interventionsTodo){
         this.deleteSpecificItemFromTimeline(event.previousContainer.data[0]);
         }else if(event.container.data.length <1){
           copyArrayItem(event.previousContainer.data,
             event.container.data,
             event.previousIndex,
             event.currentIndex);
         }
      }
    }

这工作正常，现在我对 angular 应用程序（jasmine/karma）进行了单元测试，我正在尝试调度 CdkDragDrop 事件，以便我可以验证我的drop()函数的功能。

所以在 angular 文档中有一个关于组件 DOM 测试的小章节，其中提到你必须在你想要触发事件的地方获取 htmlElement，我喜欢这样：angular docs

    let Dbg = fixture.debugElement;
    let htE = Dbg.nativeElement.querySelector(".dragContainer");

现在我有了要在其上触发事件的元素，因此完整代码如下所示

    let Dbg = fixture.debugElement;
      let htE = Dbg.nativeElement.querySelector(".dragContainer");

      htE.addEventListener('CdkDragDrop', (ev:any) => {
        component.drop(ev);
      });
      let bla = htE.dispatchEvent(new Event('cdkDropListDropped'));

所以 bla 返回 true，这（如果我没有错）意味着事件被触发，但似乎没有任何 fixture.detectchanges()事情自动发生。回答但似乎无法在那种事件测试中找到任何东西..

Answer 1

您可以使用一些模拟事件来测试您的drop方法，而不是尝试从模板中触发事件。我通过使用通用的DragDropEventFactory来做到这一点。

Summary-table-side-bar.component.spec.ts说明了相应的单元测试的外观。