What are you doing?

I have a suite of mocha tests that sequelize.close() in the after hook. These tests run to completion in 5.8.8. In 5.8.9, they hang.

@sushantdhiman: I'm guessing this is a result of dcf079b#diff-b9cfc7f2cdf78a7f4b91a753d10865a2L43

To Reproduce
Create a new directory, install modules:

$ mkdir foo && cd foo
$ npm i sequelize mysql2 mocha

Create a simple mocha test file, a.js:

const Sequelize = require('sequelize');

sequelize = new Sequelize('tendai_test', 'root', null, {dialect: 'mysql'});

after(async () => await sequelize.close());

describe(__filename, () => it('noop test', async () => await sequelize.query('DO 0')));

What do you expect to happen?

Running the test should complete:

$ mocha a.js

Executing (default): DO 0
  /Users/kieffer/foo/a.js
    ✓ noop test


  1 passing (54ms)

$  # (test finishes)

What is actually happening?

$ mocha a.js

Executing (default): DO 0
  /Users/kieffer/foo/a.js
    ✓ noop test

  1 passing (54ms)

(test hangs until mocha times out)

As noted, if you downgrade to sequelize 5.8.8, the problem goes away.

Environment

Dialect library version: mysql1.6.5
Database version: mysql Ver 14.14 Distrib 5.7.23, for osx10.13 (x86_64) using EditLine wrapper
Sequelize version: 5.8.9
Node Version: happens in both node 8 and 10
OS: MacOS 10.13.6
Tested with latest release:

• No
• Yes, specify that version: 5.8.9