Open handle keeps Jest from exiting ( TCPSERVERWRAP)

Error:

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

● TCPSERVERWRAP

Env:

• Node 10
• Supertest 3.3.0
• Jest 23.6

Testcode:

const request = require('supertest');
const app = require('../app');

describe('Test the status paths', () => {
    test('The GET / route should give status code 200', async () => {
        expect.assertions(1);
        const response = await request(app).get('/');
        expect(response.statusCode).toBe(200);
    });

    test('The GET /status route should give status code 200', async () => {
        expect.assertions(1);
        const response = await request(app).get('/status');
        expect(response.statusCode).toBe(200);
    });
});

Full console output:

 PASS  tests/app.test.js
  Test if test database is configured correctly
    ✓ Jest should create a test database (54ms)
  Test the status paths
    ✓ The GET / route should give status code 200 (28ms)
    ✓ The GET /status route should give status code 200 (7ms)

Test Suites: 1 passed, 1 total
Tests:       3 passed, 3 total
Snapshots:   0 total
Time:        1.179s
Ran all test suites.

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

  ●  TCPSERVERWRAP

      27 |     test('The GET /status route should give status code 200', async () => {
      28 |         expect.assertions(1);
    > 29 |         const response = await request(app).get('/status');
         |                                             ^
      30 |         expect(response.statusCode).toBe(200);
      31 |     });
      32 | });

      at Test.Object.<anonymous>.Test.serverAddress (node_modules/supertest/lib/test.js:59:33)
      at new Test (node_modules/supertest/lib/test.js:36:12)
      at Object.obj.(anonymous function) [as get] (node_modules/supertest/index.js:25:14)
      at Object.get (tests/app.test.js:29:45)

^C

[yss14]

For me this did the trick

afterAll(async () => {
	await new Promise(resolve => setTimeout(() => resolve(), 500)); // avoid jest open handle error
});

Seems like it needs some more ticks to close that handle.

[alfonsoal1983]

@AlexisNava

Try this in your app.test

const request = require('supertest');
const app = require('../app');
describe('App Request', () => {
  test('should responds with 404', async (done) => {
    const result = await request(app).get('/');
    expect(result.status).toBe(404);
    done();
  });
});