Jest promise not resolving

I am testing my express server in Jest. All test pass but Jest doesn't close or exit. I have no idea why but I believe my server is closing after the test runs. I tried running yarn jest --detectOpenHandles and the response came back saying "Jest has detected the following 1 open handle potentially keeping Jest from exiting:

• Promise"

Here is my code...

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


const server = app.listen(8000, '127.0.0.1');

afterAll(() => {
  server.close();
});

describe('GET /', () => {
  it('should respond with JSON (list of all users)', async () => {
    try {
      const response = await request(server).get('/')
        .expect('Content-Type', /json/);
      expect(response.statusCode).toBe(200);
    } catch (e) {
      console.log(e);
    }
  });
});

I can't seem to understand why the promise isn't resolving if that's actually the issue. My express app is pulling data from Firebase and returning the data once a get request is made. Any ideas on what's going on?