[PR #9975/8704bc7 backport][3.11] Add test coverage for accessing StaticResource._routes

[bdraco]

(cherry picked from commit 8704bc7)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.02%. Comparing base (454f914) to head (d79a02c).
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    #9977      +/-   ##
==========================================
+ Coverage   96.65%   98.02%   +1.37%     
==========================================
  Files         120      122       +2     
  Lines       36805    36888      +83     
  Branches     4415     4440      +25     
==========================================
+ Hits        35573    36161     +588     
+ Misses       1004      544     -460     
+ Partials      228      183      -45     

Flag	Coverage Δ
CI-GHA	97.92% <100.00%> (+1.31%)	⬆️
OS-Linux	97.62% <100.00%> (?)
OS-Windows	94.52% <100.00%> (?)
OS-macOS	96.73% <100.00%> (+0.13%)	⬆️
Py-3.10.11	96.59% <100.00%> (+0.28%)	⬆️
Py-3.10.15	97.18% <100.00%> (?)
Py-3.11.10	97.21% <100.00%> (?)
Py-3.11.9	96.66% <100.00%> (+0.27%)	⬆️
Py-3.12.7	97.69% <100.00%> (?)
Py-3.13.0	97.67% <100.00%> (?)
Py-3.9.13	96.52% <100.00%> (?)
Py-3.9.20	97.10% <100.00%> (?)
Py-pypy7.3.16	96.67% <100.00%> (?)
VM-macos	96.73% <100.00%> (+0.13%)	⬆️
VM-ubuntu	97.62% <100.00%> (?)
VM-windows	94.52% <100.00%> (?)

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[codspeed-hq]

CodSpeed Performance Report

Merging #9977 will improve performances by 25.43%

_{Comparing patchback/backports/3.11/8704bc74f127497496d4e3241304a6f6d2346494/pr-9975 (d79a02c) with 3.11 (902e7b2)}

Summary

⚡ 5 improvements
✅ 38 untouched benchmarks

Benchmarks breakdown

	Benchmark	3.11	patchback/backports/3.11/8704bc74f127497496d4e3241304a6f6d2346494/pr-9975	Change
⚡	test_simple_web_response	637.2 µs	550 µs	+15.86%
⚡	test_simple_web_stream_response	392.9 µs	313.2 µs	+25.43%
⚡	test_web_response_with_bytes_body	727.5 µs	642.1 µs	+13.3%
⚡	test_web_response_with_headers	1.2 ms	1.1 ms	+8.74%
⚡	test_web_response_with_text_body	857 µs	772 µs	+11.02%