Test case for #4500 and respective fix #4487

[s0undt3ch]

• Create a new changelog file in the changelog folder, with a name like <ISSUE NUMBER>.<TYPE>.rst. See changelog/README.rst for details.
• Target the master branch for bug fixes, documentation updates and trivial changes.
• Include new tests or update existing tests when applicable.

[codecov]

Codecov Report

Merging #4501 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #4501      +/-   ##
==========================================
+ Coverage   95.88%   95.91%   +0.02%     
==========================================
  Files         111      111              
  Lines       25086    25093       +7     
  Branches     2448     2448              
==========================================
+ Hits        24054    24068      +14     
+ Misses        726      724       -2     
+ Partials      306      301       -5

Flag	Coverage Δ
#docs	30.08% <0%> (+0.06%)	⬆️
#doctesting	30.08% <0%> (+0.06%)	⬆️
#linting	30.08% <0%> (+0.06%)	⬆️
#linux	95.73% <100%> (+0.02%)	⬆️
#nobyte	92.68% <100%> (+0.01%)	⬆️
#numpy	93.45% <100%> (ø)	⬆️
#pexpect	41.85% <0%> (-0.02%)	⬇️
#py27	94.05% <100%> (+0.02%)	⬆️
#py34	92.19% <100%> (+0.07%)	⬆️
#py35	92.21% <100%> (+0.07%)	⬆️
#py36	92.23% <100%> (+0.07%)	⬆️
#py37	94.12% <100%> (+0.03%)	⬆️
#trial	93.45% <100%> (ø)	⬆️
#windows	94.13% <100%> (ø)	⬆️
#xdist	93.98% <100%> (ø)	⬆️

Impacted Files	Coverage Δ
testing/test_capture.py	99.24% <100%> (ø)	⬆️
src/_pytest/capture.py	93.66% <0%> (+0.45%)	⬆️
src/_pytest/terminal.py	92.95% <0%> (+0.83%)	⬆️

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