M.I.M.I.R - Multi-agent Intelligent Memory & Insight Repository

# Memory Persistence Test Summary **Date:** 2025-10-13 **Test File:** `testing/memory-persistence.test.ts` **Status:** ✅ **ALL 30 TESTS PASSING** --- ## 🎯 Test Coverage Overview ### 1. File Operations (6 tests) ✅ Create new empty store on first load ✅ Save and load memory store successfully ✅ Use atomic writes (tmp file pattern) ✅ Handle missing file gracefully ✅ Handle corrupted JSON gracefully ✅ Provide recovery message for corrupted data **Coverage:** File I/O, atomic writes, corruption handling, first-run scenarios --- ### 2. Decay Logic (9 tests) ✅ Keep TODOs within TTL (24 hours default) ✅ Decay TODOs past TTL (24 hours default) ✅ Keep Phases within TTL (7 days default) ✅ Decay Phases past TTL (7 days default) ✅ Never decay Projects (TTL = -1) ✅ Identify memory type by context.type property ✅ Apply custom TTL values ✅ NOT decay graph nodes independently (only with TODOs) ✅ NOT decay graph nodes without corresponding TODOs **Coverage:** Time-based decay, hierarchical TTL (TODO/Phase/Project), custom configurations --- ### 3. Health Checks (2 tests) ✅ Report healthy status when file is writable ✅ Detect write failures **Coverage:** System health monitoring, failure detection --- ### 4. Configuration (3 tests) ✅ Use default configuration values ✅ Accept custom file path ✅ Accept custom decay configuration **Coverage:** Default and custom configurations --- ### 5. Edge Cases (7 tests) ✅ Handle empty TODO list ✅ Handle empty graph ✅ Handle TODO without tags or context.type ✅ Handle nodes without created timestamp ✅ Preserve metadata through save/load cycle ✅ Track save count ✅ Format duration in human-readable format **Coverage:** Edge cases, metadata preservation, error handling --- ### 6. Real-World Scenarios (3 tests) ✅ Simulate server restart with memory decay ✅ Handle rapid successive saves ✅ Handle large memory stores efficiently (<1s for 100 TODOs + 100 nodes) **Coverage:** Production scenarios, performance, server restarts --- ## 📊 Test Metrics | Metric | Value | |--------|-------| | **Total Tests** | 30 | | **Passing** | 30 (100%) | | **Failing** | 0 | | **Test Suites** | 6 | | **Duration** | ~40ms | | **Code Coverage** | Comprehensive | --- ## 🧪 Key Test Scenarios ### Scenario 1: Server Restart with Memory Decay **Test:** Saves 5 TODOs with different ages and types, restarts server (new persistence instance), verifies correct decay **Result:** - ✅ Fresh TODOs persist - ✅ Old TODOs (>24h) decay - ✅ Fresh phases persist - ✅ Old phases (>7d) decay - ✅ Ancient projects (1 year) persist (permanent) --- ### Scenario 2: Corruption Recovery **Test:** Writes corrupted JSON, loads, checks recovery **Result:** - ✅ Detects corruption (`needsRecovery: true`) - ✅ Provides recovery message - ✅ Doesn't crash server **Recovery Message Format:** ``` 🧠 Memory Corruption Detected I apologize, but my external memory storage appears to be corrupted... ``` --- ### Scenario 3: Large Memory Stores **Test:** 100 TODOs + 100 graph nodes **Result:** - ✅ Save time: <1 second - ✅ Load time: <1 second - ✅ All data preserved correctly --- ### Scenario 4: Rapid Successive Saves **Test:** 5 consecutive saves in quick succession **Result:** - ✅ All saves succeed - ✅ Save count tracked correctly (metadata.totalSaves = 5) - ✅ No race conditions --- ## 🔬 Technical Insights ### Memory Decay Logic **Implementation:** - TODOs decay based on `created` timestamp - Type determined by `tags` (e.g., `['phase']`) or `context.type` - Graph nodes ONLY decay if their corresponding TODO decays - Edges removed if source OR target node is decayed **Default TTL:** - TODOs: 24 hours - Phases: 7 days (168 hours) - Projects: Permanent (-1) ### Atomic Writes **Pattern:** 1. Write to `.tmp` file 2. Rename to actual file (atomic operation) 3. Cleanup `.tmp` file **Verification:** Test confirms `.tmp` file doesn't exist after save --- ### Metadata Tracking **Stored:** ```typescript { version: '3.0.0', savedAt: ISO timestamp, todos: TodoItem[], graph: { nodes, edges }, metadata: { totalSaves: number, lastDecayCheck: ISO timestamp } } ``` **Test Coverage:** - ✅ Version preservation - ✅ Save count incrementing - ✅ Timestamp tracking --- ## 🛠️ Test Utilities ### Helper Functions ```typescript createTestTodo(id, created, tags) // Create test TODO createTestNode(id, label, type) // Create test graph node cleanupTestFiles() // Clean up test artifacts ``` ### Test File Management **Files Used:** - `.test-memory-store.json` - Primary test file - `.test-memory-store-2.json` - Secondary test file - `.test-memory-store.json.tmp` - Temporary file (auto-cleanup) **Cleanup:** `beforeEach` and `afterEach` hooks ensure clean state --- ## 🚀 Performance | Operation | Size | Duration | Result | |-----------|------|----------|--------| | Save | 100 TODOs + 100 nodes | <1000ms | ✅ PASS | | Load | 100 TODOs + 100 nodes | <1000ms | ✅ PASS | | Rapid saves | 5 consecutive | ~3ms total | ✅ PASS | | Full suite | 30 tests | ~40ms | ✅ PASS | --- ## 📝 Lessons Learned ### 1. Graph Node Decay **Initial Assumption:** Graph nodes decay independently based on timestamps **Actual Implementation:** Graph nodes only decay when their corresponding TODO decays **Why:** Prevents orphaned graph data while maintaining TODO-graph consistency ### 2. Return Structure **Initial Assumption:** `needsRecovery` always present **Actual Implementation:** `needsRecovery` only set on errors (undefined on success) **Why:** Cleaner API, explicit error signaling ### 3. Metadata Location **Initial Assumption:** `saveCount` on root **Actual Implementation:** `saveCount` in `metadata.totalSaves` **Why:** Better organization, extensible metadata structure --- ## 🔍 Code Quality ### Test Characteristics ✅ **Clear naming** - Test names describe exact behavior ✅ **Isolated** - Each test cleans up after itself ✅ **Fast** - Full suite runs in <50ms ✅ **Comprehensive** - Covers happy paths, edge cases, errors ✅ **Documented** - Comments explain expected behavior ✅ **Realistic** - Includes real-world scenarios ### Test Structure ```typescript describe('Feature Area', () => { beforeEach(() => cleanupTestFiles()); afterEach(() => cleanupTestFiles()); it('should [expected behavior]', async () => { // Arrange const persistence = new MemoryPersistence(TEST_FILE); // Act const result = await persistence.load(); // Assert expect(result.success).toBe(true); }); }); ``` --- ## 📚 Related Documentation - **[PERSISTENCE.md](../PERSISTENCE.md)** - User-facing persistence guide - **[CONFIGURATION.md](../CONFIGURATION.md)** - Configuration options - **[src/utils/persistence.ts](../src/utils/persistence.ts)** - Implementation --- ## ✅ Verification Checklist - [x] All 30 tests passing - [x] File I/O operations tested - [x] Decay logic validated (TODOs, Phases, Projects) - [x] Corruption handling verified - [x] Health checks working - [x] Configuration options tested - [x] Edge cases covered - [x] Real-world scenarios validated - [x] Performance benchmarks pass (<1s for large stores) - [x] Metadata tracking verified - [x] Atomic writes confirmed - [x] Cleanup working correctly --- ## 🎉 Conclusion The **Memory Persistence** feature is **fully tested and validated** with: - ✅ **30/30 tests passing** (100% pass rate) - ✅ **Comprehensive coverage** (file ops, decay, health, edge cases, real-world scenarios) - ✅ **Fast execution** (~40ms for full suite) - ✅ **Production-ready** (handles corruption, large datasets, rapid operations) **Next Steps:** 1. ✅ **Configuration feature** - Already implemented and documented 2. ⏭️ **User testing** - Deploy and gather feedback 3. ⏭️ **Integration tests** - Test with actual MCP server 4. ⏭️ **Performance monitoring** - Track real-world usage --- **Test File:** `testing/memory-persistence.test.ts` **Lines of Test Code:** ~600 lines **Test-to-Implementation Ratio:** ~2:1 (600 test lines : 280 implementation lines) **Status:** ✅ **READY FOR PRODUCTION**