For datasette issue #1802 I needed to run my pytest test suite using a specific version of Python 3.7.
I decided to do this using Docker, using the official python:3.7-buster image.
\nHere's the recipe that worked for me:
\ndocker run --rm -it -v `pwd`:/code \\\n python:3.7-buster \\\n bash -c \"cd /code && pip install -e '.[test]' && pytest\"This command runs interactively so I can see the output (the -it option).
It mounts the current directory (with my testable application in it - I ran this in the root of a datasette checkout) as the /code volume inside the container.
The --rm option ensures that the container used for the test will be deleted once the test has completed (not just stopped).
It then runs the following using bash -c:
cd /code && pip install -e '.[test]' && pytest\nThis installs my project's dependencies and test dependencies and then runs pytest.
The truncated output looks like this:
\n% docker run -it -v `pwd`:/code \\\n python:3.7-buster \\\n bash -c \"cd /code && pip install -e '.[test]' && pytest\"\nObtaining file:///code\n Preparing metadata (setup.py) ... done\nCollecting asgiref>=3.2.10\n Downloading asgiref-3.5.2-py3-none-any.whl (22 kB)\n...\nInstalling collected packages: rfc3986, mypy-extensions, iniconfig, zipp, typing-extensions, typed-ast, tomli, soupsieve, sniffio, six, PyYAML, pyparsing, pycparser, py, platformdirs, pathspec, mergedeep, MarkupSafe, itsdangerous, idna, hupper, h11, execnet, cogapp, certifi, attrs, aiofiles, python-multipart, packaging, Jinja2, janus, importlib-metadata, cffi, beautifulsoup4, asgiref, anyio, pluggy, pint, httpcore, cryptography, click, asgi-csrf, uvicorn, trustme, pytest, httpx, click-default-group-wheel, black, pytest-timeout, pytest-forked, pytest-asyncio, datasette, blacken-docs, pytest-xdist\n Running setup.py develop for datasette\n...\n========================================================= test session starts ==========================================================\nplatform linux -- Python 3.7.13, pytest-7.1.3, pluggy-1.0.0\nSQLite: 3.27.2\nrootdir: /code, configfile: pytest.ini\nplugins: asyncio-0.19.0, anyio-3.6.1, timeout-2.1.0, xdist-2.5.0, forked-1.4.0\nasyncio: mode=strict\ncollected 1054 items \n\ntests/test_package.py .. [ 0%]\ntests/test_cli.py . [ 0%]\ntests/test_cli_serve_get.py .. [ 0%]\ntests/test_cli.py . [ 0%]\ntests/test_black.py . [ 0%]\ntests/test_api.py .................................................. [ 5%]\n