问生成swagger json文件而不运行nest服务器

EN

// my-api.e2e-spec.ts

import { Test, TestingModule } from '@nestjs/testing';
import { FastifyAdapter, NestFastifyApplication } from '@nestjs/platform-fastify';
import { HttpModule } from '@nestjs/axios';
import { SwaggerModule, DocumentBuilder } from '@nestjs/swagger';
import * as fs from 'fs';

describe('My E2E Tests', () => {
  let app: NestFastifyApplication;

  beforeAll(async () => {
    const module: TestingModule = await Test.createTestingModule({
      imports: [HttpModule],
    }).compile();

    app = module.createNestApplication(new FastifyAdapter());
    app.setGlobalPrefix('/api/v1');
    await app.init();
    await app.getHttpAdapter().getInstance().ready();
  });

  afterAll(async () => {
    await app.close();
  });

  it('should generate swagger spec', async () => {
    const config = new DocumentBuilder().setTitle('My API').setDescription('My API').setVersion('1.0').build();

    const document = SwaggerModule.createDocument(app, config);
    fs.writeFileSync('./swagger.json', JSON.stringify(document));
  });
});