Angular 2 测试错误无法读取未定义的属性“forEach”

Question

我正在尝试测试一个 component.ts：

import { ActivatedRoute, Params } from '@angular/router';
import { Location } from '@angular/common';
...
ngOnInit(): void {
    this.route.params.forEach((params: Params) => {
        let id = +params['id'];
...
}

spec.ts 代码如下：

describe('MyDetailComponent', () => {
    beforeEach( async(() => {
    addMatchers();
    TestBed.configureTestingModule({
            imports: [ MaterialModule, FormsModule ],
            declarations: [ MyDetailComponent ],
            providers: [
                ...
                { provide: RequestOptions, useClass: RequestOptionsStub },
                { provide: ActivatedRoute,      useClass: RouterStub },
                { provide: Location }, 
                { provide: XHRBackend, useClass: MockBackend },
                AppSettings,
                Http,
                ConnectionBackend,
                Jsonp
            ]
        })
    .compileComponents()
    .then(createComponent);
}));

我得到了错误： 失败：未捕获（在承诺中）：错误：错误：0:0 导致：无法读取未定义的属性“forEach” TypeError：无法读取未定义的属性“forEach”

如何解决这个问题？

Answer 1

在Angular2 RC5 Mock Activated Route Params 找到答案：

import { Observable } from 'rxjs/Rx';

...

{ provide: ActivatedRoute, useValue: { 'params': Observable.from([{ 'id': 1 }]) } }