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MySQL process and client fixtures for pytest

Project description


Latest PyPI version Wheel Status Supported Python Versions License

What is this?

This is a pytest plugin, that enables you to test your code that relies on a running MySQL Database. It allows you to specify fixtures for MySQL process and client.


Only MySQL 5.7.6 and up are supported. For older versions, please use pytest-mysql 2.0.3 Although Pull Request to add back support for older MySQL versions are welcome.

How to use

Plugin contains two fixtures

  • mysql - it’s a client fixture that has functional scope. After each test drops test database from MySQL ensuring repeatability.
  • mysql_proc - session scoped fixture, that starts MySQL instance at it’s first use and stops at the end of the tests.

Simply include one of these fixtures into your tests fixture list.

You can also create additional mysql client and process fixtures if you’d need to:

from pytest_mysql import factories
from getpass import getuser()

mysql_my_proc = factories.mysql_proc(
    port=None, user=getuser())
mysql_my = factories.mysql('mysql_my_proc')


Each MySQL process fixture can be configured in a different way than the others through the fixture factory arguments.


You can define your settings in three ways, it’s fixture factory argument, command line option and pytest.ini configuration option. You can pick which you prefer, but remember that these settings are handled in the following order:

  • Fixture factory argument
  • Command line option
  • Configuration option in your pytest.ini file
Configuration options
MySQL/MariaDB option Fixture factory argument Command line option pytest.ini option Noop process fixture Default
Path to executable mysqld_exec –mysql-mysqld mysql_mysqld
Path to safe executable mysqld_safe –mysql-mysqld-safe mysql_mysqld_safe
Path to mysql_install_db for legacy installations install_db –mysql-install-db mysql_install_db
Path to Admin executable admin_executable –mysql-admin mysql_admin
Database hostname host –mysql-host mysql_host yes localhost
Database port port –mysql-port mysql_port yes (3306) random
MySQL user to work with user –mysql-user mysql_user
User’s password passwd –mysql-passwd mysql_passwd
Test database name dbname –mysql-dbname mysqldbname
Starting parameters params –mysql-params mysql_params
Log directory location [DEPRECATED] logsdir –mysql-logsdir mysql_logsdir

Example usage:

  • pass it as an argument in your own fixture

    mysql_proc = factories.mysql_proc(
  • use --mysql-port command line option when you run your tests

    py.test tests --mysql-port=8888
  • specify your port as mysql_port in your pytest.ini file.

    To do so, put a line like the following under the [pytest] section of your pytest.ini:

    mysql_port = 8888


Populating database for tests

With SQLAlchemy

This example shows how to populate database and create an SQLAlchemy’s ORM connection:

Sample below is simplified session fixture from pyramid_fullauth tests:

from sqlalchemy import create_engine
from sqlalchemy.orm import scoped_session, sessionmaker
from sqlalchemy.pool import NullPool
from zope.sqlalchemy import register

def db_session(mysql):
    """Session for SQLAlchemy."""
    from pyramid_fullauth.models import Base  # pylint:disable=import-outside-toplevel

    # assumes setting, these can be obtained from pytest-mysql config or mysql_proc
    connection = f'mysql+mysqldb://root:@'

    engine = create_engine(connection, echo=False, poolclass=NullPool)
    pyramid_basemodel.Session = scoped_session(sessionmaker(extension=ZopeTransactionExtension()))
        engine, pyramid_basemodel.Session, should_create=True, should_drop=True)

    yield pyramid_basemodel.Session


def user(db_session):
    """Test user fixture."""
    from pyramid_fullauth.models import User
    from import DEFAULT_USER

    new_user = User(**DEFAULT_USER)
    return new_user

def test_remove_last_admin(db_session, user):
    Sample test checks internal login, but shows usage in tests with SQLAlchemy
    user = db_session.merge(user)
    user.is_admin = True
    user = db_session.merge(user)

    with pytest.raises(AttributeError):
        user.is_admin = False


See the original code at pyramid_fullauth’s conftest file. Depending on your needs, that in between code can fire alembic migrations in case of sqlalchemy stack or any other code

Connecting to MySQL/MariaDB (in a docker)

To connect to a docker run postgresql and run test on it, use noproc fixtures.

docker run --name some-db -e MYSQL_ALLOW_EMPTY_PASSWORD=yes -d mysql --expose 3306
docker run --name some-db -e MARIADB_ALLOW_EMPTY_PASSWORD=yes -d mariadb --expose 3306

This will start postgresql in a docker container, however using a postgresql installed locally is not much different.

In tests, make sure that all your tests are using mysql_noproc fixture like that:

mysql_in_docker = factories.mysql_noproc()
mysql = factories.mysql("mysql_in_docker")

def test_mysql_docker(mysql):
    """Run test."""
    cur = mysql.cursor()
    cur.query("CREATE TABLE pet (name VARCHAR(20), owner VARCHAR(20), species VARCHAR(20), sex CHAR(1), birth DATE, death DATE);")

And run tests:

pytest --mysql-host=

Running on Docker/as root

Unfortunately, running MySQL as root (thus by default on docker) is not possible. MySQL (and MariaDB as well) will not allow it.

USER nobody

This line should switch your docker process to run on user nobody. See this comment for example




  • add user option to setup and tear down mysql process as non-privileged


  • Add Python 3.10 to CI



  • mysql_noproc fixture to connect to already running mysql server
  • raise more meaningful error when the test database already exists


  • rely on get_port functionality delivered by port_for


  • Deprecated mysql_logsdir ini configuration and –mysql-logsdir command option
  • Deprecated logs_prefix process fixture factory setting


  • Require minimum python 3.7
  • Migrate CI to Github Actions


  • [enhancement] Do not assume that mysql executables are in /usr/bin


  • [enhancement] Preemptively read data after each test in mysql client fixture. This will make test run if the test itself forgot to fetch queried data.
  • [enhnacement] Require at least mirakuru 2.3.0 - forced by changed stop method parameters change


  • [fix] Improved mysql version detection on osx
  • [build] extracted xdist into separate stage on travis
  • [build] have deployemt as separate stage on travis


  • [Enhancements] Add support for MySQL 5.7.6 and up with new configuration options. Legacy configuration supports older MySQL and MariaDB databases.
  • [breaking] mysql_exec ini option replaced with mysql_mysqld_safe
  • [breaking] –mysql-exec cmd option replaced with –mysql-mysqld-safe
  • [breaking] replaced mysql_init ini option with mysql_install_db
  • [breaking] replaced –mysql-init cmd option with –mysql-install-db
  • [breaking] added mysql_mysqld option and –mysql-mysqld cmd option


  • [enhancements] removed dependency


  • [enhancement] change deprecated getfuncargvalaue to getfixturevalues, require at least pytest 3.0.0


  • [enhancements] create command line and pytest.ini configuration options for mysql’s log directory location
  • [enhancements] create command line and pytest.ini configuration options for mysql’s starting parametetrs
  • [enhancements] create command line and pytest.ini configuration options for mysql test database name
  • [enhancements] create command line and pytest.ini configuration options for mysql’s user password
  • [enhancements] create command line and pytest.ini configuration options for mysql user
  • [enhancements] create command line and pytest.ini configuration options for mysql host
  • [enhancements] create command line and pytest.ini configuration options for mysql port
  • [enhancements] create command line and pytest.ini configuration options for mysql’s init executable
  • [enhancements] create command line and pytest.ini configuration options for mysql’s admin executable
  • [enhancements] create command line and pytest.ini configuration options for mysql executable
  • [enhancements] create command line and pytest.ini configuration options for mysql logsdir

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