Add more URL subtraction coverage

[bdraco]

#1388 will remove PurePath and replace it with an internal helper, however there are still some cases that are not correct that will need to be addressed. To ensure future refactoring does not cause regressions, add more coverage.

[codspeed-hq]

CodSpeed Performance Report

Merging #1389 will not alter performance

_{Comparing subtract_tests (826d790) with master (7a272d2)}

Summary

✅ 85 untouched benchmarks

[commonism]

diff --git a/tests/test_url.py b/tests/test_url.py
index e2bcac7..7b86b55 100644
--- a/tests/test_url.py
+++ b/tests/test_url.py
@@ -69,7 +69,12 @@ def test_str():
         (
             "http://example.com/////path/////to",
             "http://example.com/////spam",
-            "path/to",
+            "path/////to",
+        ),
+        (
+                "http://example.com////path/////to",
+                "http://example.com/////spam",
+                "..//path/////to",
         ),
         ("http://example.com/this/is/a/test", "http://example.com/this/", "is/a/test"),
         (

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.06%. Comparing base (7a272d2) to head (826d790).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1389   +/-   ##
=======================================
  Coverage   96.06%   96.06%           
=======================================
  Files          31       31           
  Lines        5767     5774    +7     
  Branches      361      361           
=======================================
+ Hits         5540     5547    +7     
  Misses        201      201           
  Partials       26       26           

Flag	Coverage Δ
CI-GHA	96.06% <100.00%> (+<0.01%)	⬆️
MyPy	46.14% <100.00%> (+0.06%)	⬆️
OS-Linux	99.55% <100.00%> (+<0.01%)	⬆️
OS-Windows	99.61% <100.00%> (+<0.01%)	⬆️
OS-macOS	99.30% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	99.27% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	99.51% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	99.51% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	99.27% <100.00%> (+<0.01%)	⬆️
Py-3.12.7	99.51% <100.00%> (+<0.01%)	⬆️
Py-3.13.0	99.51% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	99.23% <100.00%> (+<0.01%)	⬆️
Py-3.9.20	99.47% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	99.52% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.17	99.55% <100.00%> (+<0.01%)	⬆️
VM-macos-latest	99.30% <100.00%> (+<0.01%)	⬆️
VM-ubuntu-latest	99.55% <100.00%> (+<0.01%)	⬆️
VM-windows-latest	99.61% <100.00%> (+<0.01%)	⬆️
pytest	99.55% <100.00%> (+<0.01%)	⬆️

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