APP_INITIALIZER失败的测试用例

import { TestBed, async } from '@angular/core/testing';
import { APP_INITIALIZER } from '@angular/core';
import { MyConfigService } from 'path/to/my-config.service';

describe('APP_INITIALIZER', () => {
  beforeEach(async(() => {
    TestBed.configureTestingModule({
      providers: [
        MyConfigService,
        {
          provide: APP_INITIALIZER,
          useFactory: (configService: MyConfigService) => () => configService.load(),
          deps: [MyConfigService],
          multi: true
        }
      ]
    }).compileComponents();
  }));

  it('should handle APP_INITIALIZER failure', async(() => {
    const configService = TestBed.get(MyConfigService);
    
    spyOn(console, 'error'); // Spy on console.error() to check if error is logged
    
    // Mock the failure scenario
    spyOn(configService, 'load').and.returnValue(Promise.reject('Failed to load configuration'));

    TestBed.compileComponents().then(() => {
      expect(console.error).toHaveBeenCalledWith('Failed to load configuration');
      // Additional assertions or expectations for the failure case
    });
  }));
});