Add unit tests for AssetManager#20789

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WarLikeLaux wants to merge 3 commits intoyiisoft:masterfrom

WarLikeLaux:add-AssetManagerTest

Commits on Mar 9, 2026

Add unit tests for `AssetManager`
WarLikeLaux
committed
Fix `AssetManagerTest`: stronger assertions, Windows compatibility, remove duplicates
WarLikeLaux
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Strengthen `AssetManagerTest` assertions and skip `fileMode` test on Windows
WarLikeLaux
committed