Jest has detected the following 1 open handle potentially keeping Jest from exiting: TCPSERVERWRAP

I am doing a basic end to end testing here, for the moment it's failing, but first I can't get rid of the open handle.

Ran all test suites.

Jest has detected the following 1 open handle potentially keeping Jest from exiting:

  ●  TCPSERVERWRAP

      40 |     }
      41 |     return request(app.getHttpServer())
    > 42 |       .post('/graphql')
         |        ^
      43 |       .send(mutation)
      44 |       .expect(HttpStatus.OK)
      45 |       .expect((response) => {

      at Test.Object.<anonymous>.Test.serverAddress (../node_modules/supertest/lib/test.js:61:33)
      at new Test (../node_modules/supertest/lib/test.js:38:12)
      at Object.obj.<computed> [as post] (../node_modules/supertest/index.js:27:14)
      at Object.<anonymous> (app.e2e-spec.ts:42:8)

import { Test, TestingModule } from '@nestjs/testing'
import { HttpStatus, INestApplication } from "@nestjs/common";
import * as request from 'supertest'
import { AppModule } from '../src/app.module'

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

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

    app = moduleFixture.createNestApplication()
    await app.init()
  })

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

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

  it('mutation', async () => {
    const mutation = {
      query: `mutation Create($title: String!) {
        create(title: $title) {
          id,
          title
        }
      }`,
      variables: {
        title: 'Mon programme',
      },
    }
    return request(app.getHttpServer())
      .post('/graphql')
      .send(mutation)
      .expect(HttpStatus.OK)
      .expect( (response) => {
        expect(response.body).toBe({
          id: expect.any(String),
          title: 'Mon programme',
        })
      })
  })
})

Any idea what's blocking the test runner ?

Note that, as I am using NestJs, I shouldn't need to use the .end(done) method at the end of the test.

PS: apparently I have to much code on this question and I need to add some more details, but have no clue what I can say more.

I still haven't found a perfect solution, but for the moment I went for this workaround :

jest --config ./test/jest-e2e.json --forceExit

The --forceExit option kill the openHandles somehow and unlock everything. Yet, I'm still looking for the "proper way" of handling that issue.