testcontainers 3.3.0

Library provides lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container

Python port for testcontainers-java that allows using docker containers for functional and integration testing. Testcontainers-python provides capabilities to spin up docker containers (such as a database, Selenium web browser, or any other container) for testing.

Currently available features:

• Selenium Grid containers

• Selenium Standalone containers

• MySql Db container

• MariaDb container

• Neo4j container

• OracleDb container

• PostgreSQL Db container

• Microsoft SQL Server container

• Generic docker containers

• LocalStack

Installation

The testcontainers package is available from PyPI, and it can be installed using pip. Depending on which containers are needed, you can specify additional dependencies as extras:

# Install without extras
pip install testcontainers
# Install with one or more extras
pip install testcontainers[mysql]
pip install testcontainers[mysql,oracle]

Basic usage

import sqlalchemy
from testcontainers.mysql import MySqlContainer

with MySqlContainer('mysql:5.7.17') as mysql:
    engine = sqlalchemy.create_engine(mysql.get_connection_url())
    version, = engine.execute("select version()").fetchone()
    print(version)  # 5.7.17

The snippet above will spin up a MySql database in a container. The get_connection_url() convenience method returns a sqlalchemy compatible url we use to connect to the database and retrieve the database version.

More extensive documentation can be found at Read The Docs.

Usage within Docker (i.e. in a CI)

When trying to launch a testcontainer from within a Docker container two things have to be provided:

1. The container has to provide a docker client installation. Either use an image that has docker pre-installed (e.g. the [official docker images](https://hub.docker.com/_/docker)) or install the client from within the Dockerfile specification.

2. The container has to have access to the docker daemon which can be achieved by mounting /var/run/docker.sock or setting the DOCKER_HOST environment variable as part of your docker run command.

Setting up a development environment

We recommend you use a virtual environment for development. Note that a python version >=3.6 is required. After setting up your virtual environment, you can install all dependencies and test the installation by running the following snippet.

pip install -r requirements/$(python -c 'import sys; print("%d.%d" % sys.version_info[:2])').txt
pytest -s

Adding requirements

We use pip-tools to resolve and manage dependencies. If you need to add a dependency to testcontainers or one of the extras, run pip install pip-tools followed by make requirements to update the requirements files.