Add test that C extension is correctly loaded

[lysnikolaou]

What do these changes do?

• Adds a test that the C extensions are loaded okay.

Are there changes in behavior for the user?

No.

[codspeed-hq]

CodSpeed Performance Report

Merging #1475 will improve performances by 8.93%

_{Comparing lysnikolaou:add-tests-c-extension-loaded (b241d39) with master (426b7ac)}

Summary

⚡ 1 improvements
✅ 98 untouched benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	test_url_with_port	329.1 µs	302.1 µs	+8.93%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.57%. Comparing base (426b7ac) to head (b241d39).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1475   +/-   ##
=======================================
  Coverage   95.57%   95.57%           
=======================================
  Files          33       33           
  Lines        6006     6010    +4     
  Branches      364      364           
=======================================
+ Hits         5740     5744    +4     
  Misses        240      240           
  Partials       26       26           

Flag	Coverage Δ
CI-GHA	95.57% <100.00%> (+<0.01%)	⬆️
MyPy	49.71% <50.00%> (+<0.01%)	⬆️
OS-Linux	98.83% <100.00%> (+<0.01%)	⬆️
OS-Windows	98.85% <100.00%> (+<0.01%)	⬆️
OS-macOS	98.58% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	98.56% <100.00%> (+<0.01%)	⬆️
Py-3.10.16	98.79% <100.00%> (+<0.01%)	⬆️
Py-3.11.11	98.79% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	98.56% <100.00%> (+<0.01%)	⬆️
Py-3.12.8	98.56% <100.00%> (+<0.01%)	⬆️
Py-3.12.9	98.79% <100.00%> (+<0.01%)	⬆️
Py-3.13.1	98.56% <100.00%> (+<0.01%)	⬆️
Py-3.13.2	98.79% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	98.52% <100.00%> (+<0.01%)	⬆️
Py-3.9.21	98.75% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	98.74% <75.00%> (-0.03%)	⬇️
Py-pypy7.3.18	98.76% <75.00%> (-0.03%)	⬇️
VM-macos-latest	98.58% <100.00%> (+<0.01%)	⬆️
VM-ubuntu-latest	98.83% <100.00%> (+<0.01%)	⬆️
VM-windows-latest	98.85% <100.00%> (+<0.01%)	⬆️
pytest	98.83% <100.00%> (+<0.01%)	⬆️

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[bdraco]

Thanks @lysnikolaou