[PR #8936/76a00d1e backport][3.11] Test coverage of TextIOWrapper

[patchback]

This is a backport of PR #8936 as merged into master (76a00d1).

None

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.73%. Comparing base (297ddae) to head (3b4fa1d).
Report is 2 commits behind head on 3.11.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.11    #8945   +/-   ##
=======================================
  Coverage   97.72%   97.73%           
=======================================
  Files         108      108           
  Lines       34310    34319    +9     
  Branches     4073     4073           
=======================================
+ Hits        33530    33542   +12     
+ Misses        583      581    -2     
+ Partials      197      196    -1     

Flag	Coverage Δ
CI-GHA	97.63% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.31% <100.00%> (+<0.01%)	⬆️
OS-Windows	94.87% <100.00%> (+0.01%)	⬆️
OS-macOS	96.99% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	97.08% <100.00%> (+<0.01%)	⬆️
Py-3.10.14	97.02% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.25% <100.00%> (+<0.01%)	⬆️
Py-3.12.5	97.35% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	96.99% <100.00%> (+<0.01%)	⬆️
Py-3.9.19	96.93% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	96.52% <100.00%> (+<0.01%)	⬆️
VM-macos	96.99% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	97.31% <100.00%> (+<0.01%)	⬆️
VM-windows	94.87% <100.00%> (+0.01%)	⬆️

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