Namespace Serenity.GameSave.Tests.Domain

CheckpointsSection-specific tests: payload get/set/remove, serialize/deserialize round-trips, and null-payload reset behavior.

CompletionSection-specific tests: clamping, playtime accumulation, and serialize/deserialize round-trips.

InventorySection-specific tests: add/remove/query behavior and serialize/deserialize round-trips.

MilestonesSection-specific tests: idempotent marking and serialize/deserialize round-trips.

SaveDocument-specific tests: metadata, section payload get/set, and key ordering.

SaveSlotId-specific tests: construction validation, equality, and hashing.