当我尝试运行“ng test”时，我只是得到如下结果：

Karma v6.3.4 UI错误信息：

0个质量标准，0个失效，使用种子98146随机化，装载期间错误：未捕获引用错误：在http：//localhost：9876/karma_webpack/main.js行125中初始化之前无法访问“AppComponent”

终端错误信息：

afterAll Uncaught ReferenceError中抛出错误：**初始化前无法访问“AppComponent”*ReferenceError：无法在模块初始化之前访问“AppComponent”。AppComponent（http：//localhost：9876/ karma_webpack /main. js：125：61）位于Module.36747（http：//localhost：9876/ karma_webpack */webpack：/src/app/app. module. ts：16：5）

App.module TS FILE：

import { NgModule } from '@angular/core';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { ServiceWorkerModule } from '@angular/service-worker';
import { environment } from '../environments/environment';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { NgxUiLoaderModule } from 'ngx-ui-loader';
import { MatSnackBarModule } from '@angular/material/snack-bar';
import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';
import { HttpConfigInterceptor } from './auth/httpconfig.interceptor';
import { HeaderModule } from './shared/header/header.module';
import { RouterModule } from '@angular/router';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    AppRoutingModule,
    BrowserAnimationsModule,
    ServiceWorkerModule.register('ngsw-worker.js', { enabled: environment.serviceWorker, registrationStrategy: 'registerImmediately' }),
    NgxUiLoaderModule,
    MatSnackBarModule,
    HttpClientModule,
    HeaderModule
  ],
  providers: [
    AppComponent,
    {
      provide: HTTP_INTERCEPTORS,
      useClass: HttpConfigInterceptor,
      multi: true
    }
  ],
  exports: [
    RouterModule
  ],
  bootstrap: [AppComponent]

})
export class AppModule { }

有人知道我们该怎么解决这个问题吗？