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Python library for throwaway instances of anything that can run in a Docker container

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Poetry Ruff PyPI - Version PyPI - License PyPI - Python Version codecov Core Tests Community Tests Docs

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Testcontainers Python

testcontainers-python facilitates the use of Docker containers for functional and integration testing.

For more information, see the docs.

Getting Started

>>> from testcontainers.postgres import PostgresContainer
>>> import sqlalchemy

>>> with PostgresContainer("postgres:16") as postgres:
...     engine = sqlalchemy.create_engine(postgres.get_connection_url())
...     with engine.begin() as connection:
...         result = connection.execute(sqlalchemy.text("select version()"))
...         version, = result.fetchone()
>>> version
'PostgreSQL 16...'

The snippet above will spin up a postgres 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.

Contributing / Development / Release

See CONTRIBUTING.md for more details.

Configuration

You can set environment variables to configure the library behaviour:

Env Variable Example Description
TESTCONTAINERS_DOCKER_SOCKET_OVERRIDE /var/run/docker.sock Path to Docker's socket used by ryuk
TESTCONTAINERS_RYUK_PRIVILEGED false Run ryuk as a privileged container
TESTCONTAINERS_RYUK_DISABLED false Disable ryuk
RYUK_CONTAINER_IMAGE testcontainers/ryuk:0.8.1 Custom image for ryuk
RYUK_RECONNECTION_TIMEOUT 10s Reconnection timeout for Ryuk TCP socket before Ryuk reaps all dangling containers

Alternatively you can set the configuration during runtime:

from testcontainers.core import testcontainers_config

testcontainers_config.ryuk_docker_socket = "/home/user/docker.sock"

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