tox: split default posargs, use --lsof with single job only

[blueyed]

This is required for combining.

[blueyed]

The plan is to use lsof with only a few jobs.
This should now not use it all, and hopefully codecov will show.

[codecov]

Codecov Report

Merging #4847 into master will decrease coverage by 1.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4847      +/-   ##
==========================================
- Coverage   94.29%   93.17%   -1.12%     
==========================================
  Files         113      113              
  Lines       25172    25172              
  Branches     2499     2499              
==========================================
- Hits        23735    23455     -280     
- Misses       1100     1379     +279     
- Partials      337      338       +1

Impacted Files	Coverage Δ
testing/test_argcomplete.py	20.28% <0%> (-47.83%)	⬇️
src/_pytest/_argcomplete.py	33.33% <0%> (-41.67%)	⬇️
src/_pytest/debugging.py	44.02% <0%> (-13.21%)	⬇️
testing/test_conftest.py	90.33% <0%> (-9.3%)	⬇️
testing/test_pathlib.py	91.17% <0%> (-8.83%)	⬇️
testing/test_pdb.py	40.27% <0%> (-7.88%)	⬇️
src/_pytest/pytester.py	80.51% <0%> (-5.84%)	⬇️
testing/python/integration.py	86.52% <0%> (-4.97%)	⬇️
testing/test_collection.py	95.22% <0%> (-4.59%)	⬇️
testing/test_tmpdir.py	94.62% <0%> (-4.31%)	⬇️
... and 16 more

---

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[nicoddemus]

This should now not use it all, and hopefully codecov will show.

You think lsof was the cause for the timeouts?

I can reach codecov by clicking on the image (https://codecov.io/gh/pytest-dev/pytest/pull/4847?src=pr&el=tree), but all other links still time out to me.

[blueyed]

You think lsof was the cause for the timeouts?

No, I've meant that it will show missing coverage.

[blueyed]

I will compare it manually/rebase it when codecov works again.

[nicoddemus]

OK, thanks!

[blueyed]

Waiting for codecov status.
Good according to https://codecov.io/github/pytest-dev/pytest/commit/3452460090c7233a78baed6557a65af432b2422f.

[blueyed]

@nicoddemus
Changed/simplified, please re-review.

[blueyed]

Needs the fix from #4851, i.e. should also get done against features then.

[blueyed]

Backed out to previous 9186d62 and rebased (due to the PYTEST_ADDOPTS issue).
I would like to use the lsof factor with #4865 then.

[blueyed]

Given that lsof is only used to cover the code for it (we do not react / handle its warnings anyway), this could also be done with a faster job for less overhead maybe.