mock_s3 interfering SQLAlchemy calls to local MySQL databases

Please consider the below code snippet.

#!/usr/bin/env python

from sqlalchemy import create_engine
from sqlalchemy_utils import database_exists
from moto import mock_s3



@mock_s3
def test_foob():
    database_exists("mysql+pymysql://user:password@127.0.0.1")

If we run this with pytests, it will fail with the below error.

 sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (2013, 'Lost connection to MySQL server during query')

However, if we remove the @mock_s3 decorator, it passes. Any idea why this is happening?

[spulec]

Great, thanks for opening the issue!

[kennydo]

master looks good to me!

(in python3.4)

>>> with moto.mock_s3():
...     pymysql.connect(host='127.0.0.1', user='root', db='foo_test')
...
<pymysql.connections.Connection object at 0x102cc9da0>