angular – 修改TestBed.overrideComponent中定义的组件

TestBed.overrideComponent(CoolComponent,{
    set: {
      template: '<div id="fake-component">i am the fake component</div>',selector: 'our-cool-component',inputs: [ 'model' ]
    }
  })

覆盖组件.

该组件具有我们在ngOnInit方法中配置的ViewChild

@Component({
  selector: 'our-cool-component',templateUrl: 'cool.component.html'
})
export class CoolComponent implements OnInit,OnDestroy {
  @Input() model: SomeModel
  @ViewChild(CoolChildComponent) coolChildComponent;

  ngOnInit() {
    this.coolChildComponent.doStuff();
  }
}

CoolComponent依次生活在一个Wrapper组件中.

当我们在Wrapper fixture上调用fixture.detectChanges()时,会尝试构造CoolComponent,但是当它调用doStuff()时,它会立即死机,因为CoolChildComponent是未定义的.

有没有办法得到CoolComponent存根的CoolChildComponent？看起来我们可以把它从Wrapper中取消,因为它只能通过模板引用,而不是组件的属性.