Improve test coverage for storage classes #2808

Job	Run time
doctests	1m 16s
py=3.11-min_deps	3m 15s
os=ubuntu-latest, py=3.11, np=1.25, deps=minimal	5m 47s
py=3.13-upstream	5m 19s
os=ubuntu-latest, py=3.11, np=1.25, deps=optional	5m 38s
os=ubuntu-latest, py=3.11, np=2.1, deps=minimal	5m 25s
os=ubuntu-latest, py=3.11, np=2.1, deps=optional	5m 29s
os=ubuntu-latest, py=3.12, np=1.25, deps=minimal	6m 27s
os=ubuntu-latest, py=3.12, np=1.25, deps=optional	6m 29s
os=ubuntu-latest, py=3.12, np=2.1, deps=minimal	6m 7s
os=ubuntu-latest, py=3.12, np=2.1, deps=optional	6m 8s
os=ubuntu-latest, py=3.13, np=1.25, deps=minimal	9m 16s
os=ubuntu-latest, py=3.13, np=1.25, deps=optional	9m 8s
os=ubuntu-latest, py=3.13, np=2.1, deps=minimal	6m 12s
os=ubuntu-latest, py=3.13, np=2.1, deps=optional	6m 16s
os=macos-latest, py=3.11, np=1.25, deps=optional	3m 41s
os=macos-latest, py=3.13, np=2.1, deps=optional	4m 11s
os=windows-latest, py=3.11, np=1.25, deps=optional	9m 13s
os=windows-latest, py=3.13, np=2.1, deps=optional	8m 45s
Test complete	1s
	1h 54m 3s

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