Class Child

packages/router/test/router_preloader.spec.ts:188–192

    const CHILD_TOKEN = new InjectionToken<string>('test token for child');

    @NgModule({
      imports: [RouterModule.forChild([{path: 'child', redirectTo: ''}])],
      providers: [{provide: CHILD_TOKEN, useValue: 'child'}],
    })
    class Child {}

    TestBed.configureTestingModule({
      providers: [