NullInjectorError: No provider for InjectionToken ToastConfig! in jasmine spec for Angular + Electron project

Try to specify the position of toaster otherwise it will give null Inject error

app.module.ts

 imports: [
    BrowserModule,
    AppRoutingModule,
    HttpClientModule,
    BrowserAnimationsModule,
    FormsModule,
    BsDropdownModule.forRoot(),
    ToastrModule.forRoot({
      positionClass :'toast-bottom-right'
    })
  ],