Question

因此，我一直在为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 drag-drop API的组件。

html代码如下所示

<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>

很好，现在我有cdkDropListDroppet事件，该事件调用函数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);
         }
      }
    }

这很好用，现在可以对角度应用程序（茉莉花/业力）进行单元测试并且我正在尝试调度CdkDragDrop事件，以便我可以验证我的drop()函数的功能。

因此，在角度文档中有一小章涉及组件DOM测试，其中提到必须在要触发事件的位置获取htmlElement，我这样做是这样的：angular docs

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

现在我具有要在其上触发事件的元素，因此完整的代码如下所示

    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，这表示（如果我没记错的话）表示事件已被触发，但似乎什么也没发生 fixture.detectchanges()自动发生。我试图调试它以查看发生了什么，但是listener函数从未被触发，我四处寻找找到答案，但似乎无法在这种事件测试中找到任何东西。

Answer 1

您可以尝试使用一些模拟事件来测试def __init__(self,list_names,list_values): [setattr(self,name,value) for name,value in zip(list_names,list_values)]方法，而不用尝试从模板中触发事件。我这样做是通过使用通用的DragDropEventFactory。

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

CdkDragDrop单元测试事件

1 个答案: