Requiring Mongoose creates open handles

[craigfay]

🐛 Bug Report

Although similar mongoose integration issues exist in this tracker, most deal primarily with failure to close mongoose connections properly. I believe this issue is unique, in that it is caused by simply requiring mongoose in a test.

Importing Mongoose as a dependency (or any JS module that depends on Mongoose) causes the following message when Jest is run with --detectOpenHandles:

> jest int --detectOpenHandles

 PASS  ./main.int.test.js
  ✓ true is true (6ms)

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        1.524s, estimated 2s
Ran all test suites matching /int/i.

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

  ●  DNSCHANNEL

      at dns.js:338:23

To Reproduce

/**
 * Dependencies
 */
const mongoose = require('mongoose');

test('true is true', () => {
    expect(true).toBe(true);
})

  "dependencies": {
    "mongoose": "^5.3.11"
  },
  "devDependencies": {
    "jest": "^23.5.0"
  },
  "jest": {
    "moduleNameMapper": {
      "testEnvironment": "node"
    },
    "moduleDirectories": [
      "node_modules"
    ]
  }

Expected behavior

The test should be able to include modules that use mongoose as a dependency and terminate properly.

Link to Repo

https://github.com/CBFay/jest-mongoose-open-handle

Run npx envinfo --preset jest

Paste the results here:

System:
    OS: macOS Sierra 10.12.6
    CPU: (4) x64 Intel(R) Core(TM) i5-4260U CPU @ 1.40GHz
  Binaries:
    Node: 10.5.0 - /usr/local/bin/node
    npm: 6.1.0 - /usr/local/bin/npm
  npmPackages:
    jest: ^23.5.0 => 23.6.0 

[kevinburke]

Previously here: #6423

Perhaps the answer you are looking for may be found there.

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