nestjs 模块设置用于测试

Question

我想在 mall.service.spec.ts 中测试我的商城服务 请帮忙解释为什么 npm 不起作用。

// mall.service.spec.ts

describe('MallService', () => {
  let service: MallService

  beforeEach(async () => {
    const module: TestingModule = await Test.createTestingModule({
      imports: [TypeOrmModule.forFeature([User, TestRepository])],
      controllers: [MallController],
      providers: [
        MallService,
        {
          provide: IUSER_REPOSITORY,
          useClass: TestRepository,
        },
      ],
    }).compile()

    service = module.get<MallService>(MallService)
  })

  it('should be defined', () => {
    expect(service).toBeDefined()
  })
})

// mall.service.ts
@Injectable()
export class MallService {
  constructor(
    @Inject(IUSER_REPOSITORY)
    private readonly userRepository: IUserRepository,
  ) {}
...
}

模块设置有什么问题？ 当我运行测试时，它会显示如下所示。

 - Nest can't resolve dependencies of the MallController (?). Please
   make sure that the argument MallService at index [0] is available in
   the RootTestModule context.
   
   Potential solutions:
     - Is RootTestModule a valid NestJS module?
     - If MallService is a provider, is it part of the current RootTestModule?
     - If MallService is exported from a separate @Module, is that module imported within RootTestModule?
       @Module({
           imports: [ /* the Module containing MallService */ ]
         })*

请帮忙，谢谢。 请帮忙，谢谢。 请帮忙，谢谢。

Answer 1

我相信你必须覆盖提供者，如下所示。 更多内容可以阅读NestJS 文档

// mall.service.spec.ts

describe('MallService', () => {
  let service: MallService

  beforeEach(async () => {
    const module: TestingModule = await Test.createTestingModule({
      imports: [TypeOrmModule.forFeature([User, TestRepository])],
      controllers: [MallController],
      providers: [
        MallService,
        IUSER_REPOSITORY,
      ],
    }).overrideProvider(IUSER_REPOSITORY)
      .useValue(TestRepository)
      .compile()

    service = module.get<MallService>(MallService)
  })

  it('should be defined', () => {
    expect(service).toBeDefined()
  })
})