argparsing: Parser: allow to forward prog to argparse

[blueyed]

Ref: pytest-dev/pytest-xdist#388.

[codecov]

Codecov Report

Merging #4528 into features will increase coverage by 0.02%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##           features    #4528      +/-   ##
============================================
+ Coverage     95.75%   95.78%   +0.02%     
============================================
  Files           111      111              
  Lines         24951    24956       +5     
  Branches       2460     2460              
============================================
+ Hits          23893    23903      +10     
+ Misses          748      746       -2     
+ Partials        310      307       -3

Flag	Coverage Δ
#docs	29.33% <42.85%> (+0.07%)	⬆️
#doctesting	29.33% <42.85%> (+0.07%)	⬆️
#linting	29.33% <42.85%> (+0.07%)	⬆️
#linux	95.59% <100%> (ø)	⬆️
#nobyte	92.43% <100%> (ø)	⬆️
#numpy	93.24% <100%> (+0.01%)	⬆️
#pexpect	41.72% <42.85%> (+0.01%)	⬆️
#py27	93.82% <100%> (+0.02%)	⬆️
#py34	91.94% <100%> (+0.06%)	⬆️
#py35	91.96% <100%> (+0.06%)	⬆️
#py36	91.98% <100%> (+0.06%)	⬆️
#py37	93.95% <100%> (+0.01%)	⬆️
#trial	93.24% <100%> (+0.01%)	⬆️
#windows	93.98% <100%> (ø)	⬆️
#xdist	93.82% <100%> (-0.02%)	⬇️

Impacted Files	Coverage Δ
src/_pytest/config/argparsing.py	88.2% <100%> (+0.05%)	⬆️
testing/test_parseopt.py	94.8% <100%> (+0.08%)	⬆️
src/_pytest/terminal.py	92.95% <0%> (+0.83%)	⬆️

---

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[codecov]

Codecov Report

Merging #4528 into features will increase coverage by 0.02%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##           features    #4528      +/-   ##
============================================
+ Coverage     95.75%   95.78%   +0.02%     
============================================
  Files           111      111              
  Lines         24951    24956       +5     
  Branches       2460     2460              
============================================
+ Hits          23893    23903      +10     
+ Misses          748      746       -2     
+ Partials        310      307       -3

Flag	Coverage Δ
#docs	29.33% <42.85%> (+0.07%)	⬆️
#doctesting	29.33% <42.85%> (+0.07%)	⬆️
#linting	29.33% <42.85%> (+0.07%)	⬆️
#linux	95.59% <100%> (ø)	⬆️
#nobyte	92.43% <100%> (ø)	⬆️
#numpy	93.24% <100%> (+0.01%)	⬆️
#pexpect	41.72% <42.85%> (+0.01%)	⬆️
#py27	93.82% <100%> (+0.02%)	⬆️
#py34	91.94% <100%> (+0.06%)	⬆️
#py35	91.96% <100%> (+0.06%)	⬆️
#py36	91.98% <100%> (+0.06%)	⬆️
#py37	93.95% <100%> (+0.01%)	⬆️
#trial	93.24% <100%> (+0.01%)	⬆️
#windows	93.98% <100%> (ø)	⬆️
#xdist	93.82% <100%> (-0.02%)	⬇️

Impacted Files	Coverage Δ
src/_pytest/config/argparsing.py	88.2% <100%> (+0.05%)	⬆️
testing/test_parseopt.py	94.8% <100%> (+0.08%)	⬆️
src/_pytest/terminal.py	92.95% <0%> (+0.83%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8152b68...3445eae. Read the comment docs.