pytest-dev / pytest-dev/pytest-xdist
Make "-n 0" not error with "--dist" set
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Description
I have this in my pytest.ini:
[pytest]
addopts = --numprocesses auto
--dist loadscope
When I need to run with just one process, such as when I am just running a limited number of tests, using just -n 0 crashes:
$ pytest -n 0
...
platform darwin -- Python 3.9.1, pytest-6.2.2, py-1.10.0, pluggy-0.13.1
...
ERROR: MISSING test execution (tx) nodes: please specify --tx
It would be great if -n 0 didn't need to worry about the dist mode.
This is similar to #549 which made --pdb imply --dist no alongside -n 0.
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Research direction
Start by reproducing the reported pytest -n 0 failure with --dist loadscope configured in pytest.ini. Inspect the option handling for -n and --dist, then verify that forcing one process no longer requires distributed execution and that the existing distributed mode still works.
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Assessment
- Tech stack
- python
- Domain
- cli, testing-qa
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Clearly specified
- Newbie friendliness
- 42/100