
    <div class="icon-wrapper test-class">
      <nz-icon nzType="frown" [class.icon-highlight]="preHighLight" />
      <nz-slider [nzMin]="0" [nzMax]="20" [(ngModel)]="sliderValue"></nz-slider>
      <nz-icon nzType="smile" [class.icon-highlight]="nextHighLight" />
    </div>
  