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Description:

pytestmysql 3.0.0

pytest-mysql

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.

Warning
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.
mysql_noproc - session scoped fixtures, that allows to connect to already existing MySQL instance, and cleans the database 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')

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

Configuration
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

mysqld

Path to safe executable
mysqld_safe
–mysql-mysqld-safe
mysql_mysqld_safe

mysqld_safe

Path to mysql_install_db for legacy installations
install_db
–mysql-install-db
mysql_install_db

mysql_install_db

Path to Admin executable
admin_executable
–mysql-admin
mysql_admin

mysqladmin

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

root

User’s password
passwd
–mysql-passwd
mysql_passwd

Test database name
dbname
–mysql-dbname
mysql_dbname

test

Starting parameters
params
–mysql-params
mysql_params

Log directory location [DEPRECATED]
logsdir
–mysql-logsdir
mysql_logsdir

$TMPDIR

Example usage:

pass it as an argument in your own fixture

mysql_proc = factories.mysql_proc(
port=8888)

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:
[pytest]
mysql_port = 8888

Examples

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

@pytest.fixture
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:@127.0.0.1:3307/tests?charset=utf8'

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

yield pyramid_basemodel.Session

transaction.commit()
Base.metadata.drop_all(engine)

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

new_user = User(**DEFAULT_USER)
db_session.add(new_user)
transaction.commit()
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
transaction.commit()
user = db_session.merge(user)

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

Note
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 MySQL 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 MySQL in a docker container, however using a MySQL 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);")
mysql.commit()
cur.close()
And run tests:
pytest --mysql-host=127.0.0.1

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

Package resources

Bug tracker: https://github.com/ClearcodeHQ/pytest-mysql/issues

Release
Install pipenv and –dev dependencies first, Then run:
pipenv run tbump [NEW_VERSION]