import 'nativescript-angular/application';
import 'reflect-Metadata';
import {LoginComponent} from '../pages/login/login.component';
import {UserMockService} from './mocks/userMock.service';
import {UserService} from '../shared/user/user.service';
import {inject,beforeEachProviders,it,describe,expect,beforeEach,async} from '@angular/core/testing';
import { TestComponentBuilder } from '@angular/compiler/testing';
import {provide} from '@angular/core';

describe('Login Component',() => {
  let userMockService;
  beforeEachProviders(() => [TestComponentBuilder]);
  beforeEachProviders(() => [provide(UserService,{ useClass: userMockService })]);

  it('Should perform the login',inject([TestComponentBuilder],(tcb: TestComponentBuilder) => {
    tcb.createAsync(LoginComponent).then(fixture => {
      let component = fixture.nativeElement;
      console.log(component);
      expect(true).toBe(true);
    });
  }));
});

但是,当我运行Nativescript测试运行器时,我有以下错误：

Error: No provider for DirectiveResolver!
    BaseException@file:///app/tns_modules/@angular/core/src/facade/exceptions.js:17:32
    AbstractProviderError@file:///app/tns_modules/@angular/core/src/di/reflective_exceptions.js:39:20
    NoProviderError@file:///app/tns_modules/@angular/core/src/di/reflective_exceptions.js:75:20
    _throwOrNull@file:///app/tns_modules/@angular/core/src/di/reflective_injector.js:776:62
    initComponent@file:///app/tns_modules/@angular/compiler/testing/test_component_builder.js:296:60
    file:///app/tests/login.component.test.js:14:24
    file:///app/tns_modules/@angular/core/testing/testing.js:98:28
    attemptAsync
    run
    execute
    queueRunnerFactory
    execute
    fn
    attemptAsync
    run
    execute
    queueRunnerFactory
    fn
    attemptAsync
    run
    execute
    queueRunnerFactory
    execute
    execute
    runTests@file:///app/tns_modules/nativescript-unit-test-runner/main-view-model.js:216:23
    file:///app/tns_modules/nativescript-unit-test-runner/main-view-model.js:187:101
    tick@file:///app/tns_modules/timer/timer.js:17:26
    UIApplicationMain@[native code]
    start@file:///app/tns_modules/application/application.js:233:26
    anonymous@file:///app/./tns_modules/nativescript-unit-test-runner/app.js:3:18
    evaluate@[native code]
    moduleEvaluation@[native code]
    [native code]
    promiseReactionJob@[native code]

这是我试图测试的组件：

import {Component,OnInit} from "@angular/core";
import {Router} from "@angular/router-deprecated";
import {Page} from 'ui/page'
import {User} from "../../shared/user/user";
import {UserService} from "../../shared/user/user.service";

@Component({
    selector: "login",providers: [UserService],templateUrl: "pages/login/login.html",styleUrls: ["pages/login/login-common.css"]
})
export class LoginComponent implements OnInit {
    userName: string;
    userPassword: string;

    constructor(private userService: UserService,private router: Router,private page: Page) {

    }
    login() {
        let user = new User(this.userName,this.userPassword);

        this.userService.login(user)
            .subscribe(
            data => this.router.navigate(['Home']),error => alert("Error on login. Check your credentials.")
            );
    }

    ngOnInit() {
        this.page.actionBarHidden = true;
        if (this.userService.isLogged()) {
            this.router.navigate(["Home"]);
        }
    }
}

任何人都可以提供有关如何解决此错误并继续我的测试的线索吗？
提前致谢.