Metadata-Version: 2.1 Name: pytest-xdist Version: 1.23.0 Summary: pytest xdist plugin for distributed testing and loop-on-failing modes Home-page: https://github.com/pytest-dev/pytest-xdist Author: holger krekel and contributors Author-email: pytest-dev@python.org,holger@merlinux.eu License: MIT Platform: linux Platform: osx Platform: win32 Classifier: Development Status :: 5 - Production/Stable Classifier: Framework :: Pytest Classifier: Intended Audience :: Developers Classifier: License :: OSI Approved :: MIT License Classifier: Operating System :: POSIX Classifier: Operating System :: Microsoft :: Windows Classifier: Operating System :: MacOS :: MacOS X Classifier: Topic :: Software Development :: Testing Classifier: Topic :: Software Development :: Quality Assurance Classifier: Topic :: Utilities Classifier: Programming Language :: Python Classifier: Programming Language :: Python :: 2 Classifier: Programming Language :: Python :: 2.7 Classifier: Programming Language :: Python :: 3 Classifier: Programming Language :: Python :: 3.4 Classifier: Programming Language :: Python :: 3.5 Classifier: Programming Language :: Python :: 3.6 Requires-Python: >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.* Requires-Dist: execnet (>=1.1) Requires-Dist: pytest (>=3.0.0) Requires-Dist: pytest-forked Requires-Dist: six .. image:: http://img.shields.io/pypi/v/pytest-xdist.svg :alt: PyPI version :target: https://pypi.python.org/pypi/pytest-xdist .. image:: https://img.shields.io/conda/vn/conda-forge/pytest-xdist.svg :target: https://anaconda.org/conda-forge/pytest-xdist .. image:: https://img.shields.io/pypi/pyversions/pytest-xdist.svg :alt: Python versions :target: https://pypi.python.org/pypi/pytest-xdist .. image:: https://travis-ci.org/pytest-dev/pytest-xdist.svg?branch=master :alt: Travis CI build status :target: https://travis-ci.org/pytest-dev/pytest-xdist .. image:: https://ci.appveyor.com/api/projects/status/56eq1a1avd4sdd7e/branch/master?svg=true :alt: AppVeyor build status :target: https://ci.appveyor.com/project/pytestbot/pytest-xdist .. image:: https://img.shields.io/badge/code%20style-black-000000.svg :target: https://github.com/ambv/black xdist: pytest distributed testing plugin ======================================== The `pytest-xdist`_ plugin extends pytest with some unique test execution modes: * test run parallelization_: if you have multiple CPUs or hosts you can use those for a combined test run. This allows to speed up development or to use special resources of `remote machines`_. * ``--looponfail``: run your tests repeatedly in a subprocess. After each run pytest waits until a file in your project changes and then re-runs the previously failing tests. This is repeated until all tests pass after which again a full run is performed. * `Multi-Platform`_ coverage: you can specify different Python interpreters or different platforms and run tests in parallel on all of them. Before running tests remotely, ``pytest`` efficiently "rsyncs" your program source code to the remote place. All test results are reported back and displayed to your local terminal. You may specify different Python versions and interpreters. If you would like to know how pytest-xdist works under the covers, checkout `OVERVIEW `_. Installation ------------ Install the plugin with:: pip install pytest-xdist or use the package in develop/in-place mode with a checkout of the `pytest-xdist repository`_ :: pip install --editable . .. _parallelization: Speed up test runs by sending tests to multiple CPUs ---------------------------------------------------- To send tests to multiple CPUs, type:: pytest -n NUM Especially for longer running tests or tests requiring a lot of I/O this can lead to considerable speed ups. This option can also be set to ``auto`` for automatic detection of the number of CPUs. If a test crashes the interpreter, pytest-xdist will automatically restart that worker and report the failure as usual. You can use the ``--max-worker-restart`` option to limit the number of workers that can be restarted, or disable restarting altogether using ``--max-worker-restart=0``. By default, the ``-n`` option will send pending tests to any worker that is available, without any guaranteed order, but you can control this with these options: * ``--dist=loadscope``: tests will be grouped by **module** for *test functions* and by **class** for *test methods*, then each group will be sent to an available worker, guaranteeing that all tests in a group run in the same process. This can be useful if you have expensive module-level or class-level fixtures. Currently the groupings can't be customized, with grouping by class takes priority over grouping by module. This feature was added in version ``1.19``. * ``--dist=loadfile``: tests will be grouped by file name, and then will be sent to an available worker, guaranteeing that all tests in a group run in the same worker. This feature was added in version ``1.21``. Running tests in a Python subprocess ------------------------------------ To instantiate a python3.5 subprocess and send tests to it, you may type:: pytest -d --tx popen//python=python3.5 This will start a subprocess which is run with the ``python3.5`` Python interpreter, found in your system binary lookup path. If you prefix the --tx option value like this:: --tx 3*popen//python=python3.5 then three subprocesses would be created and tests will be load-balanced across these three processes. .. _boxed: Running tests in a boxed subprocess ----------------------------------- This functionality has been moved to the `pytest-forked `_ plugin, but the ``--boxed`` option is still kept for backward compatibility. .. _`remote machines`: Sending tests to remote SSH accounts ------------------------------------ Suppose you have a package ``mypkg`` which contains some tests that you can successfully run locally. And you have a ssh-reachable machine ``myhost``. Then you can ad-hoc distribute your tests by typing:: pytest -d --tx ssh=myhostpopen --rsyncdir mypkg mypkg This will synchronize your :code:`mypkg` package directory to a remote ssh account and then locally collect tests and send them to remote places for execution. You can specify multiple :code:`--rsyncdir` directories to be sent to the remote side. .. note:: For pytest to collect and send tests correctly you not only need to make sure all code and tests directories are rsynced, but that any test (sub) directory also has an :code:`__init__.py` file because internally pytest references tests as a fully qualified python module path. **You will otherwise get strange errors** during setup of the remote side. You can specify multiple :code:`--rsyncignore` glob patterns to be ignored when file are sent to the remote side. There are also internal ignores: :code:`.*, *.pyc, *.pyo, *~` Those you cannot override using rsyncignore command-line or ini-file option(s). Sending tests to remote Socket Servers -------------------------------------- Download the single-module `socketserver.py`_ Python program and run it like this:: python socketserver.py It will tell you that it starts listening on the default port. You can now on your home machine specify this new socket host with something like this:: pytest -d --tx socket=192.168.1.102:8888 --rsyncdir mypkg mypkg .. _`atonce`: .. _`Multi-Platform`: Running tests on many platforms at once --------------------------------------- The basic command to run tests on multiple platforms is:: pytest --dist=each --tx=spec1 --tx=spec2 If you specify a windows host, an OSX host and a Linux environment this command will send each tests to all platforms - and report back failures from all platforms at once. The specifications strings use the `xspec syntax`_. .. _`xspec syntax`: http://codespeak.net/execnet/basics.html#xspec .. _`socketserver.py`: http://bitbucket.org/hpk42/execnet/raw/2af991418160/execnet/script/socketserver.py .. _`execnet`: http://codespeak.net/execnet Identifying the worker process during a test -------------------------------------------- *New in version 1.15.* If you need to determine the identity of a worker process in a test or fixture, you may use the ``worker_id`` fixture to do so: .. code-block:: python @pytest.fixture() def user_account(worker_id): """ use a different account in each xdist worker """ return "account_%s" % worker_id When ``xdist`` is disabled (running with ``-n0`` for example), then ``worker_id`` will return ``"master"``. Additionally, worker processes have the following environment variables defined: * ``PYTEST_XDIST_WORKER``: the name of the worker, e.g., ``"gw2"``. * ``PYTEST_XDIST_WORKER_COUNT``: the total number of workers in this session, e.g., ``"4"`` when ``-n 4`` is given in the command-line. The information about the worker_id in a test is stored in the ``TestReport`` as well, under the ``worker_id`` attribute. Specifying test exec environments in an ini file ------------------------------------------------ You can use pytest's ini file configuration to avoid typing common options. You can for example make running with three subprocesses your default like this: .. code-block:: ini [pytest] addopts = -n3 You can also add default environments like this: .. code-block:: ini [pytest] addopts = --tx ssh=myhost//python=python3.5 --tx ssh=myhost//python=python3.6 and then just type:: pytest --dist=each to run tests in each of the environments. Specifying "rsync" dirs in an ini-file -------------------------------------- In a ``tox.ini`` or ``setup.cfg`` file in your root project directory you may specify directories to include or to exclude in synchronisation: .. code-block:: ini [pytest] rsyncdirs = . mypkg helperpkg rsyncignore = .hg These directory specifications are relative to the directory where the configuration file was found. .. _`pytest-xdist`: http://pypi.python.org/pypi/pytest-xdist .. _`pytest-xdist repository`: https://github.com/pytest-dev/pytest-xdist .. _`pytest`: http://pytest.org