angular-docs-cn/modules/@angular/common/test/spies.ts

import {ChangeDetectorRef} from '@angular/core/src/change_detection/change_detector_ref';
import {SpyObject, proxy} from '@angular/core/testing/testing_internal';

export class SpyChangeDetectorRef extends SpyObject {
  constructor() {
    super(ChangeDetectorRef);
    this.spy('markForCheck');
  }
}

export class SpyNgControl extends SpyObject {}

export class SpyValueAccessor extends SpyObject { writeValue: any; }