testcontainers / Testcontainers Python
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testcontainers-python
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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 <https://pypi.org/project/testcontainers/>
, and it can be installed using :code:pip
. Depending on which containers are needed, you can specify additional dependencies as extras <https://setuptools.readthedocs.io/en/latest/setuptools.html#declaring-extras-optional-features-with-their-own-dependencies>
:
.. code-block:: bash
# Install without extras
pip install testcontainers
# Install with one or more extras
pip install testcontainers[mysql]
pip install testcontainers[mysql,oracle]
Basic usage
.. code-block:: python
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 :code:get_connection_url()
convenience method returns a :code: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 <http://testcontainers-python.readthedocs.io/>
_.
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:
- The container has to provide a docker client installation. Either use an image that has docker pre-installed (e.g. the official docker images) or install the client from within the
Dockerfile
specification. - The container has to have access to the docker daemon which can be achieved by mounting
/var/run/docker.sock
or setting theDOCKER_HOST
environment variable as part of yourdocker run
command.
Setting up a development environment
We recommend you use a virtual environment <https://virtualenv.pypa.io/en/stable/>
_ for development. Note that a python version :code:>=3.6
is required. After setting up your virtual environment, you can install all dependencies and test the installation by running the following snippet.
.. code-block:: bash
pip install -r requirements/$(python -c 'import sys; print("%d.%d" % sys.version_info[:2])').txt
pytest -s
Adding requirements ^^^^^^^^^^^^^^^^^^^
We use :code:pip-tools
to resolve and manage dependencies. If you need to add a dependency to testcontainers or one of the extras, run :code:pip install pip-tools
followed by :code:make requirements
to update the requirements files.