javascript - Angular 4 单元测试错误 - 无法在 'send' : Failed to load 'XMLHttpRequest' 上执行 'ng:///DynamicTestModule/LoginComponent.ngfactory.js'

Question

我正在为我的组件编写一些单元测试，但我收到了这个神秘的错误消息。我在 Angular 2 unit testing - getting error Failed to load 'ng:///DynamicTestModule/module.ngfactory.js' 发现了类似的问题但答案并没有帮助我解决我的问题。我是 angular 4.3.2

这是我正在为其编写测试的组件:

import {Component} from '@angular/core';
import {Router} from '@angular/router';

import {NotificationService} from '../common/notification/notification.service';
import {SessionService} from '../common/session/session.service';
import {Login} from './login.model';

@Component({
             selector: 'cc-login-form',
             templateUrl: './login.component.html',
             styleUrls: ['./login.component.scss'],
           })
export class LoginComponent {
  model: Login = new Login('', '');

  constructor(private sessionService: SessionService,
              private router: Router,
              private notificationService: NotificationService) {
  }

  onSubmit() {
    this.sessionService
        .login(this.model.email, this.model.password)
        .subscribe(
          sessionInfo => {
            this.notificationService.showSuccess('notification.successfully.logged.in');
            this.router.navigate([`/cc/list`]);
          },
          error => this.notificationService.showError('notification.invalid.login')
        );
  }
}

这是测试文件:

import {async, ComponentFixture, TestBed} from '@angular/core/testing';
import {FormsModule} from '@angular/forms';
import {Router} from '@angular/router';
import {TranslateModule, TranslateService} from '@ngx-translate/core';
import {NotificationService} from '../common/notification/notification.service';
import {NotificationServiceStub} from '../common/notification/tests/NotificationServiceStub';
import {SessionService} from '../common/session/session.service';
import {SessionServiceStub} from '../common/session/tests/SessionServiceStub';
import {RouterStub} from '../common/tests/RouterStub';
import {TranslateServiceStub} from '../common/translate/tests/TranslateServiceStub';

import {LoginComponent} from './login.component';

describe('LoginComponent', () => {
  let component: LoginComponent;
  let fixture: ComponentFixture<LoginComponent>;

  beforeEach(async(() => {
    TestBed.configureTestingModule({
                                     imports: [
                                       FormsModule,
                                       TranslateModule
                                     ],
                                     declarations: [LoginComponent],
                                     providers: [
                                       {provide: SessionService, useClass: SessionServiceStub},
                                       {provide: Router, useClass: RouterStub},
                                       {provide: NotificationService, useClass: NotificationServiceStub},
                                       {provide: TranslateService, useClass: TranslateServiceStub},
                                     ]
                                   })
           .compileComponents();
  }));

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

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

运行测试时，我在 chrome 控制台上得到以下信息:

zone.js:2642 XMLHttpRequest cannot load ng:///DynamicTestModule/LoginComponent.ngfactory.js. Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https.
(anonymous) @ zone.js:2642
zone.js:195 Uncaught DOMException: Failed to execute 'send' on 'XMLHttpRequest': Failed to load 'ng:///DynamicTestModule/LoginComponent.ngfactory.js'.
    at http://localhost:9876/_karma_webpack_/webpack:/Users/pedrompg/Documents/quandoo/fe/chains-center/~/zone.js/dist/zone.js:2642:1
    at XMLHttpRequest.proto.(anonymous function) [as send] (

有人可以帮我吗？

编辑 - 1这是服务/ stub 实现

SessionServiceStub

export class SessionServiceStub implements ISessionService {
  login(login: string, password: string): Observable<any> {
    return Observable.of({merchantId: 123});
  }

  logout(): Observable<any> {
    throw new Error('Method not implemented.');
  }

  validateSessionToken(): Observable<any> {
    throw new Error('Method not implemented.');
  }
}

session 服务

@Injectable()
export class SessionService implements ISessionService {

  constructor(private http: CcHttpClient, private router: Router, private localSessionService: LocalSessionService) {
  }

  login(login: string, password: string): Observable<any> {
    return this.http.post(`api/sessions`, {login: login, password: password}).map((res: Object) => {
      this.localSessionService.createSession(res);
      return res;
    });
  }
}

RouterStub

export class RouterStub {
  navigate(commands: any[], extras?: NavigationExtras): Promise<boolean> {
    return Promise.resolve(true);
  };
}

TranslationServiceStub

export class TranslateServiceStub {
  instant(key: string | Array<string>, interpolateParams?: Object): string | any {
    return 'translation';
  };
}

NotificationServiceStub

export class NotificationServiceStub implements INotificationService {
  showToast(type, text, title, defaultTitle): Promise<Toast> {
    return Promise.resolve(null);
  }

  showSuccess(msg, title?): Promise<Toast> {
    return Promise.resolve(null);
  }

  showError(msg, title?): Promise<Toast> {
    return Promise.resolve(null);
  }
}

编辑 2将我的 TestBed 配置更改为以下内容消除了错误，但带来了新的错误:

beforeEach(async(() => {
    TestBed.configureTestingModule({
                                     imports: [
                                       FormsModule,
                                       HttpClientModule,
                                       TranslateModule.forRoot({
                                                                 loader: {
                                                                   provide: TranslateLoader,
                                                                   useFactory: HttpTranslateLoaderFactory,
                                                                   deps: [HttpClient]
                                                                 }
                                                               })
                                     ],
                                     declarations: [LoginComponent],
                                     providers: [
                                       {provide: SessionService, useClass: SessionServiceStub},
                                       {provide: Router, useClass: RouterStub},
                                       {provide: NotificationService, useClass: NotificationServiceStub},
                                     ]
                                   })
           .compileComponents();
  }));

现在错误信息是

TypeError: Cannot read property 'assertPresent' of undefined
        at resetFakeAsyncZone home/pedrompg/Documents/quandoo/fe/chains-center/~/@angular/core/@angular/core/testing.es5.js:304:1)
        at Object.<anonymous> home/pedrompg/Documents/quandoo/fe/chains-center/~/@angular/core/@angular/core/testing.es5.js:1001:1)
        at ZoneQueueRunner.webpackJsonp.../../../../zone.js/dist/jasmine-patch.js.jasmine.QueueRunner.ZoneQueueRunner.execute home/pedrompg/Documents/quandoo/fe/chains-center/~/zone.js/dist/jasmine-patch.js:132:1)

在这个函数中发生的事情:

function resetFakeAsyncZone() {
    _fakeAsyncTestZoneSpec = null;
    ProxyZoneSpec.assertPresent().resetDelegate(); //ProxyZoneSpec is undefined here for whatever reason
}

Answer 1

这是 Angular Cli 1.2.2 或更高版本 的问题。使用 --sourcemaps=false 运行测试，您将收到正确的错误消息。

在 Angular 4-5 中

• >

  ng test --sourcemaps=false
  

  或
• >

  ng test -sm=false
  

在 Angular 6+ 中

• >

  ng test --source-map=false
  

在此处查看详细信息:https://github.com/angular/angular-cli/issues/7296