如何用DIV作为viewChild测试角度分量

我有一个角分量,如下图所示。我想为下面的initmychart()函数编写jasmine测试。我无法初始化库,因为我在测试中没有可访问的viewchild div元素。

component.html
<div #myId></div>

component.ts
export class MyComponent implements OnInit{

  chart: ChartLibrary;

  @ViewChild('myId') myIdDiv: ElementRef

  constructor(){}

  initMyChart(){
   //Using some library which takes the div as input to initialize
   this.chart = new Chart(this.myIdDiv.nativeElement)
  }
}

当我尝试运行测试时,会出现以下错误

console.error node_modules\jsdom\lib\jsdom\virtual-console.js:29
    Error: Not implemented: HTMLCanvasElement.prototype.getContext (without installing the canvas npm package)