Show testpaths option in the header if it has been used for collection

[nicoddemus]

Fix #4875

[blueyed]

Apart from the inverted logic in the changelog this looks good.

[codecov]

Codecov Report

Merging #4876 into features will decrease coverage by 3.29%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           features    #4876     +/-   ##
===========================================
- Coverage     95.76%   92.47%   -3.3%     
===========================================
  Files           113      113             
  Lines         25744    25239    -505     
  Branches       2508     2500      -8     
===========================================
- Hits          24655    23339   -1316     
- Misses          773     1497    +724     
- Partials        316      403     +87

Flag	Coverage Δ
#linux	92.32% <100%> (-3.27%)	⬇️
#osx	?
#windows	91.3% <100%> (-2.3%)	⬇️

Impacted Files	Coverage Δ
testing/test_session.py	96.68% <ø> (-0.03%)	⬇️
src/_pytest/terminal.py	91.47% <100%> (-0.41%)	⬇️
testing/test_config.py	99.46% <100%> (-0.02%)	⬇️
testing/test_terminal.py	99.24% <100%> (-0.57%)	⬇️
src/_pytest/_code/_py2traceback.py	20% <0%> (-71.12%)	⬇️
testing/test_pdb.py	48.75% <0%> (-50.37%)	⬇️
testing/python/approx.py	80.45% <0%> (-19.18%)	⬇️
src/_pytest/unittest.py	75.13% <0%> (-19.14%)	⬇️
src/_pytest/compat.py	78.89% <0%> (-17.65%)	⬇️
src/_pytest/debugging.py	63.58% <0%> (-16.53%)	⬇️
... and 82 more

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[nicoddemus]

Thanks for the quick review.

I've pushed another commit also removing inifile: from the header if we don't have an inifile, I think it makes the output leaner.

What do you think?

[nicoddemus]

This test is now unnecessary, test_header already covers this.

[blueyed]

Great.