angular - 如何修复 "Error: Expected to be running in ' ProxyZone'，但未找到。” 在 mocha 测试中？

Question

我正在尝试使用 测试我的《英雄之旅》Angular 应用程序 Mocha , 柴 & webpack .我已关注 this post以及在 this guide 的帮助下，已完成设置并修复了构建错误并启动并运行了测试。

但是，除了我不使用 async() 的测试用异常(exception)，我的测试失败了。在 beforeEach钩。

通过测试

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [HttpClientTestingModule],
      providers: [HeroService, MessageService]
    });
    httpTestingController = TestBed.get(HttpTestingController);

    let mockHeroes = [...mockData];
    let mockHero = mockHeroes[0];
    // let mockId = mockHero.id;

    heroService = TestBed.get(HeroService);
  });

  afterEach(() => {
    httpTestingController.verify();
  });

  it('is created', () => {
    expect(heroService).to.exist;
  });

未通过测试

//imports
import { async, ComponentFixture, TestBed } from '@angular/core/testing';

import { DashboardComponent } from './dashboard.component';
import { HeroSearchComponent } from '../hero-search/hero-search.component';

import { RouterTestingModule } from '@angular/router/testing';
import { HeroService } from '../hero.service';
import { expect } from 'chai';

...

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [DashboardComponent, HeroSearchComponent],
      imports: [RouterTestingModule.withRoutes([])],
      providers: [{ provide: HeroService, useValue: heroService }]
    }).compileComponents();
  }));

  beforeEach(() => {
    fixture = TestBed.createComponent(DashboardComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

  it('should be created', () => {
    expect(component).to.exist;
  });

错误堆栈跟踪

1) DashboardComponent

  "before each" hook for "should be created":
Error: Expected to be running in 'ProxyZone', but it was not found.
 at Function.ProxyZoneSpec.assertPresent (node_modules\zone.js\dist\proxy.js:42:19)
 at runInTestZone (node_modules\zone.js\dist\async-test.js:202:23)
 at D:\Practice\Tour-Of-Heroes\node_modules\zone.js\dist\async-test.js:185:17
 at new ZoneAwarePromise (node_modules\zone.js\dist\zone-node.js:910:29)
 at Context.<anonymous> (node_modules\zone.js\dist\async-test.js:184:20)

我试过 Angular 5 Testing: Expected to be running in 'ProxyZone', but it was not found因为我认为这是 zone.js 使用 的一些错误 Mocha ，但没有成功。

另外，我试过关注 Mocha Documentation对于异步测试，但作为初学者，对我来说有点困难。

我试过谷歌搜索，甚至在 堆栈溢出 ，但关于 的帖子数量有限 Angular Testing 与 Mocha .
感谢任何帮助解决这个问题。

Answer 1

我在不小心使用 fakeAsync 时遇到了同样的问题在 describe功能。
删除它为我解决了这个问题。