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This commit adds extensive test coverage for all CRDT implementations in the ossa-crdt crate, including: - LWW (Last-Writer-Wins) Register: 7 tests (4 unit + 3 property-based) - TwoPMap (Two-Phase Map): 13 tests (10 unit + 3 property-based) - CausalTree (text CRDT): 13 tests (9 unit + 4 property-based) Total: 33 tests covering correctness, convergence, and CRDT properties. Key improvements: - Added proptest dependency for property-based testing - Implemented Clone for CausalTreeOp and TwoPMapOp to support tests - Added helper methods to CausalTree (new(), to_string()) - Added helper methods to CausalTreeOp (insert(), delete()) - Fixed zerocopy nightly compatibility issue with cargo config - Added SimpleCausalState test helper for time ordering Tests verify: - Basic CRDT operations (insert, update, delete) - Convergence properties across replicas - Commutativity of concurrent operations - Correct handling of tombstones in TwoPMap - Text reconstruction in CausalTree - LWW conflict resolution with tiebreaking
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