How to use the @golevelup/nestjs-rabbitmq.RabbitMQModule.forRootAsync function in @golevelup/nestjs-rabbitmq

it('should configure RabbitMQ with useExisting explicit provide', async () => {
      const spy = jest.spyOn(amqplib, 'connect');

      const instance = new RabbitConfig();

      app = await Test.createTestingModule({
        imports: [
          RabbitMQModule.forRootAsync(RabbitMQModule, {
            useExisting: {
              provide: RabbitConfig,
              value: instance,
            },
          }),
        ],
      }).compile();

      expect(spy).toHaveBeenCalledTimes(1);
      expect(spy).toHaveBeenCalledWith(uri);
    });

beforeAll(async () => {
    const moduleFixture = await Test.createTestingModule({
      providers: [SubscribeService],
      imports: [
        RabbitMQModule.forRootAsync(RabbitMQModule, {
          useFactory: () => ({
            exchanges: [
              {
                name: exchange,
                type: 'topic',
              },
            ],
            uri,
          }),
        }),
      ],
    }).compile();

    app = moduleFixture.createNestApplication();
    await app.init();
    amqpConnection = app.get(AmqpConnection);

import { RabbitMQModule } from '@golevelup/nestjs-rabbitmq';
import { Module } from '@nestjs/common';
import { AppController } from './app.controller';
import { RpcService } from './rpc/rpc.service';

const rabbitHost = process.env.NODE_ENV === 'ci' ? 'rabbit' : 'localhost';

@Module({
  imports: [
    RabbitMQModule.forRootAsync(RabbitMQModule, {
      useFactory: () => ({
        exchanges: [
          {
            name: 'exchange1',
            type: 'topic',
          },
        ],
        uri: `amqp://rabbitmq:rabbitmq@${rabbitHost}:5672`,
      }),
    }),
  ],
  controllers: [AppController],
  providers: [RpcService],
})
export class AppModule {}