browsertron / Pytest Parallel
Licence: mit
A pytest plugin for parallel and concurrent testing
Stars: ✭ 146
Programming Languages
python
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pytest-parallel
a pytest plugin for parallel and concurrent testing
What?
This plugin makes it possible to run tests quickly using multiprocessing (parallelism) and multithreading (concurrency).
Why?
pytest-xdist
is great to run tests that:
- aren't threadsafe
- perform poorly when multithreaded
- need state isolation
pytest-parallel
is better for some use cases (like Selenium tests) that:
- can be threadsafe
- can use non-blocking IO for http requests to make it performant
- manage little or no state in the Python environment
Put simply, pytest-xdist
does parallelism while pytest-parallel
does parallelism and concurrency.
Requirements
- Python3 version [3.6+]
- Unix or Mac for
--workers
- Unix, Mac, or Windows for
--tests-per-worker
Installation
pip install pytest-parallel
Options
-
workers
(optional) - max workers (aka processes) to start. Can be a positive integer orauto
which uses one worker per core. Defaults to 1. -
tests-per-worker
(optional) - max concurrent tests per worker. Can be a positive integer orauto
which evenly divides tests among the workers up to 50 concurrent tests. Defaults to 1.
Examples
# runs 2 workers with 1 test per worker at a time
pytest --workers 2
# runs 4 workers (assuming a quad-core machine) with 1 test per worker
pytest --workers auto
# runs 1 worker with 4 tests at a time
pytest --tests-per-worker 4
# runs 1 worker with up to 50 tests at a time
pytest --tests-per-worker auto
# runs 2 workers with up to 50 tests per worker
pytest --workers 2 --tests-per-worker auto
Notice
Beginning with Python 3.8, forking behavior is forced on macOS at the expense of safety.
Changed in version 3.8: On macOS, the spawn start method is now the default. The fork start method should be considered unsafe as it can lead to crashes of the subprocess. See bpo-33725.
License
MIT
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