Directive unit testing fails
问题 I am using jest.js for testing with my angular app. here is the directive I use in html: <textarea errorHighlighter formControlName="Url" name="Url" cols="50" rows="5" placeholder="Enter Page URL" (ngModelChange)="pageUrlChanges($event)"></textarea> here is my directive.ts file: import { Directive, ElementRef, SimpleChanges, HostListener, Renderer2 } from '@angular/core'; import { NgControl } from '@angular/forms'; @Directive({ selector: '[errorHighlighter]' }) export class