Slow startServer on TestintApp

[rjurado01]

I have created a new deepkit app and have edited tests/http.spec.ts to show how long does it take to start the app:

test('http controller', async () => {
    const testing = createTestingApp({
        controllers: [HelloWorldControllerHttp],
        providers: [Service]
    });

    console.time()
    await testing.startServer();
    console.timeEnd()

    try {
        const response = await testing.request(HttpRequest.GET('/hello/World'));
        expect(response.statusCode).toBe(200);
        expect(response.json).toBe("Hello World!");
    } finally {
        await testing.stopServer();
    }
});

It show me: 685 ms

If I do the same using NestJs (creates new app and measure the time):

describe('AppController (e2e)', () => {
  let app: INestApplication;

  beforeEach(async () => {
    const moduleFixture: TestingModule = await Test.createTestingModule({
      imports: [AppModule],
    }).compile();

    app = moduleFixture.createNestApplication();

    console.time();
    await app.init();
    console.timeEnd();
  });

  it('/ (GET)', () => {
    return request(app.getHttpServer())
      .get('/')
      .expect(200)
      .expect('Hello World!');
  });
});

It shows me 5ms

Why is so slow deepkit?

[marcj]

Is it every time or only the very first one? You can try it in a for loop to verify

[rjurado01]

It is true, second and other times it is faster:

but Nestjs is even faster

[marcj]

That's fine. We don't optimise for the server start as it's pointless.