Codecov Report

Merging #4523 into master will decrease coverage by 53.4%.
The diff coverage is 26.31%.

@@             Coverage Diff             @@
##           master    #4523       +/-   ##
===========================================
- Coverage   95.91%   42.51%   -53.41%     
===========================================
  Files         111       92       -19     
  Lines       25093    20868     -4225     
  Branches     2448     2338      -110     
===========================================
- Hits        24068     8871    -15197     
- Misses        724    11403    +10679     
- Partials      301      594      +293

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From #4265:

I've just noticed that with PYTEST_ADDOPTS=--cov pytest foo "foo" becomes the arg for it, which really confused me.

PYTEST_ADDOPTS will be validated separately (which is correct), but foo will still be processed by --cov, no?

but foo will still be processed by --cov, no?

Yeah.. :/
I've looked at bit at fixing this, and it might be possible by keeping the parsed namespace, instead of parsing all args altogether in the end, but not trivial.
I will change Fixes to Ref in the original comment.