spectacular-feature-testing-root.module.ts

import { NgModule, Optional, SkipSelf } from '@angular/core';
import { RouterTestingModule } from '@angular/router/testing';

import { SpectacularAppScam } from '../../shared/app-component/spectacular-app.scam';

/**
 * Static dependencies for feature testing.
 *
 * Guards against registration in multiple Angular modules.
 *
 * NOTE! Only to be imported by `SpectacularFeatureTestingModule`.
 */
@NgModule({
  imports: [RouterTestingModule, SpectacularAppScam],
})
export class SpectacularFeatureTestingRootModule {
  constructor(
    @Optional()
    @SkipSelf()
    maybeNgModuleFromParentInjector: SpectacularFeatureTestingRootModule
  ) {
    if (maybeNgModuleFromParentInjector) {
      throw new Error(
        'SpectacularFeatureTestingModule.withFeature is registered in ' +
          'multiple injectors. It seems like you have registered it in an ' +
          'application. This is a testing Angular module which should only ' +
          'be used with the Angular TestBed.'
      );
    }
  }
}