tests: harden test_nonascii_text

[blueyed]

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[codecov]

Codecov Report

Merging #5268 into features will increase coverage by 1.52%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           features   #5268      +/-   ##
===========================================
+ Coverage     92.07%   93.6%   +1.52%     
===========================================
  Files           115     115              
  Lines         26159   26161       +2     
  Branches       2578    2579       +1     
===========================================
+ Hits          24086   24487     +401     
+ Misses         1746    1358     -388     
+ Partials        327     316      -11

Impacted Files	Coverage Δ
testing/test_assertion.py	97.67% <100%> (ø)	⬆️
testing/python/collect.py	45.2% <0%> (-53.74%)	⬇️
testing/python/integration.py	80.71% <0%> (-10.72%)	⬇️
src/_pytest/compat.py	94.97% <0%> (-2.02%)	⬇️
src/_pytest/main.py	95.61% <0%> (-0.44%)	⬇️
src/_pytest/fixtures.py	97.93% <0%> (+0.13%)	⬆️
src/_pytest/python.py	93.34% <0%> (+0.24%)	⬆️
src/_pytest/runner.py	98.01% <0%> (+1.19%)	⬆️
testing/test_terminal.py	80.87% <0%> (+1.55%)	⬆️
testing/python/metafunc.py	94.66% <0%> (+2.38%)	⬆️
... and 10 more

---

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[codecov]

Codecov Report

Merging #5268 into features will increase coverage by 1.65%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##           features    #5268      +/-   ##
============================================
+ Coverage     91.33%   92.98%   +1.65%     
============================================
  Files           115      115              
  Lines         26165    26167       +2     
  Branches       2578     2579       +1     
============================================
+ Hits          23897    24332     +435     
+ Misses         1940     1507     -433     
  Partials        328      328

Impacted Files	Coverage Δ
testing/test_assertion.py	97.67% <100%> (ø)	⬆️
testing/test_tmpdir.py	75.8% <0%> (-23.12%)	⬇️
testing/python/show_fixtures_per_test.py	85.29% <0%> (-14.71%)	⬇️
testing/python/integration.py	80.71% <0%> (-10.72%)	⬇️
testing/python/metafunc.py	87.31% <0%> (-7.91%)	⬇️
src/_pytest/tmpdir.py	96.55% <0%> (-3.45%)	⬇️
testing/python/collect.py	84.43% <0%> (-3.42%)	⬇️
src/_pytest/compat.py	93.96% <0%> (-3.02%)	⬇️
testing/test_terminal.py	79.31% <0%> (-2.96%)	⬇️
testing/python/fixtures.py	96.56% <0%> (-1.95%)	⬇️
... and 16 more

---

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