angular – 在组件中使用NgbModule.forRoot()导致测试失败

除了在这个组件中,这似乎无处不在,如果我添加此导入,我的许多单元测试突然开始失败并出现此错误：

TypeError: this._unregisterListenersFn is not a function
        at NgbTooltip.ngOnDestroy

我正在使用Angular CLI进行捆绑/测试.

这是我测试失败的唯一组件.

我也尝试单独导入Tooltip / Modal模块及其相关提供程序,这是我一直得到上??面的错误.如果我在没有forRoot()的情况下尝试它,我会得到DI错误.

我不知道问题是什么.

这是spec文件：

/* tslint:disable:no-unused-variable */
import { async,ComponentFixture,TestBed } from '@angular/core/testing';
import { By } from '@angular/platform-browser';
import { DebugElement } from '@angular/core';
import { APP_BASE_HREF } from '@angular/common';
import { RouterTestingModule } from '@angular/router/testing';
import { NgbModule,NgbTooltipModule,NgbTooltipConfig,NgbModalModule } from '@ng-bootstrap/ng-bootstrap';
import { NgbModalStack } from '@ng-bootstrap/ng-bootstrap/modal/modal-stack';

import { ListItemComponent } from './list-item.component';
import { VideoPlayerService } from '../../../video-player';
import { CalendarRoutingService } from '../../calendar-routing.service';

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

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [
        ListItemComponent
      ],imports: [RouterTestingModule,NgbModule.forRoot()],providers: [
        VideoPlayerService,CalendarRoutingService,// NgbModalStack,// NgbTooltipConfig
      ]
    })
    .compileComponents();
  }));

  beforeEach(() => {
    fixture = TestBed.createComponent(ListItemComponent);
    component = fixture.componentInstance;
    component.item = { records: [] };
    fixture.detectChanges();
  });

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