| /datum/unit_test/preferences_import_replacement | Real file writes verify that rejected imports preserve the original and successful replacements are complete. |
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| /datum/unit_test/preferences_import_files | Keep every filesystem fixture separate from player saves and remove it even after an assertion fails.
Backup fixtures use distinct text markers to verify file retention and ownership. |
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| /datum/unit_test/preferences_import_files/with_client | Mock-client construction registers persistent datums; isolate and restore those registries too. |
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