单元测试失败-AccordionComponent

Question

我正在模块中导入AccordionModule。但是使用“ ng test”，我在控制台中遇到了错误-

Error: StaticInjectorError[AccordionComponent]: 
  StaticInjectorError[AccordionComponent]: 
    NullInjectorError: No provider for AccordionComponent!

我已经尝试将其导入spec.ts文件和component.ts文件中，但是仍然会出现此错误。

规范文件：

beforeEach(async(() => {
    TestBed.configureTestingModule({
        imports: [AccordionModule.forRoot()],
        declarations: [CBenefitComponent], providers: [DataService]
    }).compileComponents();
}));
beforeEach(() => {
    fixture = TestBed.createComponent(CBenefitComponent);
    component = fixture.componentInstance; fixture.detectChanges();
});

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

和CAFDetailModule：

import { NgModule } from '@angular/core'; 
import { CommonModule } from '@angular/common'; 
import { FormsModule, ReactiveFormsModule} from '@angular/forms'; 
import { AccordionModule } from 'ngx-bootstrap/accordion'; 
@NgModule({ 
    imports: [ ReactiveFormsModule, CommonModule, AccordionModule.forRoot() 
    ], 
exports: [AccordionModule], 
}) 
export class CAFDetailModule { 
    constructor(){ 
        console.log('detail module loaded'); } 
}