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我需要使用 NestJS 对我的项目中的 kafka 实现进行一些单元测试，但我不知道该怎么做。

我有一个Service多数民众赞成注入客户端卡夫卡

export class Service {
  private static readonly logger = new Logger(ProducerService.name);

  constructor(
    @Inject('kafka-registrar') private client: ClientKafka,
    private someOtherService: SomeOtherService,
  ) {}

模块

@Module({
  imports: [
    ClientsModule.register([
      {
        name: 'kafka-registrar',
        transport: Transport.KAFKA,
        options: {
          client: {
            clientId: 'hero',
            brokers: ['localhost:9092'],
          },
          consumer: {
            groupId: '1',
          },
        },
      },
    ]),
    SomeOtherService,
  ],
  providers: [Service],
})
export class Module {}

单元测试

describe('Test Controller', () => {
  let clientKafka: ClientKafka;
  let someOtherService: SomeOtherService;
  let producerService: ProducerService;

  beforeEach(async () => {
    const moduleRef = await Test.createTestingModule({
      providers: [
        ProducerService,
        {
          provide: SchemaRegistryService,
          useValue: {
            encodeWithId: jest.fn(),
          },
        },
        {
          provide: ClientKafka,
          useValue: {
            emit: jest.fn(),
          },
        },
      ],
    }).compile()

    clientKafka = moduleRef.get(ClientKafka);
    schemaRegistryService = moduleRef.get(SchemaRegistryService);
    producerService = moduleRef.get(ProducerService);
  });

该项目给我这个错误：

Error: Nest can't resolve dependencies of the ProducerService (?, SchemaRegistryService). Please make sure that the argument kafka-registrar at index [0] is available in the RootTestModule context.

Potential solutions:
- If kafka-registrar is a provider, is it part of the current RootTestModule?
- If kafka-registrar is exported from a separate @Module, is that module imported within RootTestModule?
  @Module({
    imports: [ /* the Module containing kafka-registrar */ ]
  })

我不知道如何在 NestJS 中解决这个问题。例如在 Java 中，我相信这可能是因为@Mock ClientKafka clientKafka我对 NestJS 没有任何其他经验......请帮助我！:)

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