suederat / pytest-parallel

A pytest plugin for parallel and concurrent testing

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:

1. aren't threadsafe
2. perform poorly when multithreaded
3. need state isolation

pytest-parallel is better for some use cases (like Selenium tests) that:

1. can be threadsafe
2. can use non-blocking IO for http requests to make it performant
3. 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 or auto which uses one worker per core. Defaults to 1.
• tests-per-worker (optional) - max concurrent tests per worker. Can be a positive integer or auto 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.

Source

License

MIT