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rhizome-node/spec-test-divergence-report.md

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Spec vs Implementation Test Coverage Report

Executive Summary

The rhizome-node implementation demonstrates strong alignment with core spec concepts but lacks implementation and testing for several advanced features. The fundamental delta → lossless → lossy transformation pipeline is well-implemented, while query systems, relational features, and advanced conflict resolution remain unimplemented.

Core Concept Alignment

✅ Well-Aligned Concepts

  1. Delta Structure

    • Spec: Deltas contain pointers with name/target/context fields
    • Implementation: Correctly implements both V1 (array) and V2 (object) formats
    • Tests: Basic format conversion tested, but validation gaps exist

  2. Lossless Views

    • Spec: Full inventory of all deltas composing an object
    • Implementation: LosslessViewDomain correctly accumulates deltas by entity/property
    • Tests: Good coverage of basic transformation, filtering by creator/host

  3. Lossy Views

    • Spec: Compression of lossless views using resolution strategies
    • Implementation: Initializer/reducer/resolver pattern provides flexibility
    • Tests: Domain-specific example (Role/Actor/Film) demonstrates concept

  4. Basic Conflict Resolution

    • Spec: Resolution strategies for collapsing delta sets
    • Implementation: Last-Write-Wins resolver implemented
    • Tests: Basic LWW tested, but limited to simple cases

⚠️ Partial Implementations

  1. Schemas

    • Spec: Templates for object compilation with property specification
    • Implementation: TypedCollection<T> provides thin typing layer
    • Tests: No schema validation or constraint testing

  2. Negation

    • Spec: Specific delta type with "negates" pointer
    • Implementation: Not explicitly implemented
    • Tests: No negation tests

  3. Transactions

    • Spec: Not explicitly mentioned but implied by delta grouping
    • Implementation: Transaction structure exists in types
    • Tests: Transaction filtering marked as TODO

❌ Missing Implementations

  1. Query System

    • Spec: JSON Logic expressions for filtering
    • Implementation: Types exist but no implementation
    • Tests: All query tests are skipped

  2. Relational Features

    • Spec: Schema-based relationships between objects
    • Implementation: collection-relational.ts exists but minimal
    • Tests: All relational tests are skipped

  3. Advanced Conflict Resolution

    • Spec: Multiple resolution strategies (min/max/average for numerics)
    • Implementation: Only LWW implemented
    • Tests: No tests for alternative strategies

  4. Nested Object Resolution

    • Spec: Schema-controlled depth limiting to prevent infinite recursion
    • Implementation: Not implemented
    • Tests: No tests for nested object handling

Test Coverage Gaps

Critical Missing Tests

  1. Delta Validation

    • No tests for invalid delta structures
    • No tests for required field validation
    • No tests for pointer consistency

  2. Schema Enforcement

    • No tests for schema validation during view generation
    • No tests for property type enforcement
    • No tests for nested schema application

  3. Concurrent Operations

    • No tests for concurrent delta creation
    • No tests for timestamp-based ordering edge cases
    • No tests for distributed conflict scenarios

  4. Network Resilience

    • Limited peer connection testing
    • No tests for network partitions
    • No tests for delta propagation failures

Performance and Scale

  1. Large Dataset Handling

    • No tests for entities with thousands of deltas
    • No tests for memory efficiency of views
    • No tests for query performance on large collections

  2. View Materialization

    • No tests for incremental view updates
    • No tests for view caching strategies
    • No tests for partial view generation

Recommendations

High Priority

  1. Implement Query System: The skipped query tests suggest this is a planned feature
  2. Add Schema Validation: Essential for data integrity in distributed systems
  3. Expand Conflict Resolution: Implement numeric aggregation strategies
  4. Test Edge Cases: Add validation, error handling, and concurrent operation tests

Medium Priority

  1. Implement Negation: Core spec concept currently missing
  2. Add Nested Object Handling: Prevent infinite recursion with schema depth limits
  3. Enhance Transaction Support: Complete transaction-based filtering
  4. Improve Network Testing: Add resilience and partition tolerance tests

Low Priority

  1. Performance Benchmarks: Add tests for scale and efficiency
  2. Advanced CRDT Features: Implement vector clocks or hybrid logical clocks
  3. View Optimization: Add incremental update mechanisms

Conclusion

The rhizome-node implementation successfully captures the core concepts of the spec but requires significant work to achieve full compliance. The foundation is solid, with the delta/lossless/lossy pipeline working as designed. However, advanced features like queries, schemas, and sophisticated conflict resolution remain unimplemented. The test suite would benefit from expanded coverage of edge cases, validation, and distributed system scenarios.