Add coverage for passing encoded SplitResult to create a URL

[bdraco]

We are missing direct coverage for this

[codspeed-hq]

CodSpeed Performance Report

Merging #1366 will not alter performance

_{Comparing cov_split_result (93637fe) with master (ed2d648)}

Summary

✅ 83 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.97%. Comparing base (ed2d648) to head (93637fe).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1366   +/-   ##
=======================================
  Coverage   95.97%   95.97%           
=======================================
  Files          31       31           
  Lines        5635     5638    +3     
  Branches      348      348           
=======================================
+ Hits         5408     5411    +3     
  Misses        201      201           
  Partials       26       26           

Flag	Coverage Δ
CI-GHA	95.97% <100.00%> (+<0.01%)	⬆️
MyPy	45.52% <0.00%> (-0.03%)	⬇️
OS-Linux	99.50% <100.00%> (+0.02%)	⬆️
OS-Windows	99.56% <100.00%> (+0.02%)	⬆️
OS-macOS	99.24% <100.00%> (+0.02%)	⬆️
Py-3.10.11	99.22% <100.00%> (+0.02%)	⬆️
Py-3.10.15	99.45% <100.00%> (+0.02%)	⬆️
Py-3.11.10	99.45% <100.00%> (+0.02%)	⬆️
Py-3.11.9	99.22% <100.00%> (+0.02%)	⬆️
Py-3.12.7	99.45% <100.00%> (+0.02%)	⬆️
Py-3.13.0	99.45% <100.00%> (+0.02%)	⬆️
Py-3.9.13	99.17% <100.00%> (+0.02%)	⬆️
Py-3.9.20	99.41% <100.00%> (+0.02%)	⬆️
Py-pypy7.3.16	99.47% <100.00%> (+0.02%)	⬆️
Py-pypy7.3.17	99.49% <100.00%> (+0.02%)	⬆️
VM-macos-latest	99.24% <100.00%> (+0.02%)	⬆️
VM-ubuntu-latest	99.50% <100.00%> (+0.02%)	⬆️
VM-windows-latest	99.56% <100.00%> (+0.02%)	⬆️
pytest	99.50% <100.00%> (+0.02%)	⬆️

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