Improve test coverage for storage classes #2651

Job	Run time
py=3.11-min_deps	4m 21s
py=3.13-upstream	6m 5s
doctests	1m 13s
os=ubuntu-latest, py=3.11, np=1.25, deps=minimal	6m 6s
os=ubuntu-latest, py=3.11, np=1.25, deps=optional	6m 11s
os=ubuntu-latest, py=3.11, np=2.1, deps=minimal	5m 58s
os=ubuntu-latest, py=3.11, np=2.1, deps=optional	6m 9s
os=ubuntu-latest, py=3.12, np=1.25, deps=minimal	6m 57s
os=ubuntu-latest, py=3.12, np=1.25, deps=optional	6m 58s
os=ubuntu-latest, py=3.12, np=2.1, deps=minimal	7m 9s
os=ubuntu-latest, py=3.12, np=2.1, deps=optional	6m 46s
os=ubuntu-latest, py=3.13, np=1.25, deps=minimal	9m 49s
os=ubuntu-latest, py=3.13, np=1.25, deps=optional	9m 51s
os=ubuntu-latest, py=3.13, np=2.1, deps=minimal	7m 5s
os=ubuntu-latest, py=3.13, np=2.1, deps=optional	7m 0s
os=macos-latest, py=3.11, np=1.25, deps=optional	5m 29s
os=macos-latest, py=3.13, np=2.1, deps=optional	4m 36s
os=windows-latest, py=3.11, np=1.25, deps=optional	11m 40s
os=windows-latest, py=3.13, np=2.1, deps=optional	12m 9s
Test complete	1s
	2h 11m 33s

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