# Test Additions Summary
## Overview
Added comprehensive tests for semantic deduplication and tag normalization features.
**Date:** 2026-01-29
**Total New Tests:** 17
**All Tests Status:** ✅ 99/99 passing
## New Tests Added
### 1. Semantic Deduplication Tests (6 tests)
**File:** `tests/test_sqlite_vec_storage.py`
**Class:** `TestSemanticDeduplication`
Tests cover the semantic deduplication functionality in SQLite-vec storage backend:
1. **test_semantic_duplicate_detection**
- Verifies semantically similar content is rejected within 24-hour window
- Tests reformulated content (e.g., "Claude Code is powerful" vs "The Claude Code CLI is excellent")
- Ensures original memory remains retrievable
2. **test_semantic_duplicate_time_window**
- Tests time window behavior (configurable via `MCP_SEMANTIC_DEDUP_TIME_WINDOW_HOURS`)
- Verifies content can be stored after time window expires
- Uses time mocking to simulate elapsed time
3. **test_semantic_duplicate_disabled**
- Tests disabling semantic dedup via `MCP_SEMANTIC_DEDUP_ENABLED=false`
- Ensures similar content is allowed when feature is disabled
- Verifies both memories exist when dedup is off
4. **test_semantic_duplicate_different_content**
- Verifies genuinely different content is not flagged as duplicate
- Tests content about different topics (Claude Code vs Python)
- Ensures similarity threshold works correctly
5. **test_semantic_duplicate_threshold_configuration**
- Tests configurable similarity threshold via `MCP_SEMANTIC_DEDUP_THRESHOLD`
- Verifies high threshold (0.95) allows moderately similar content
- Demonstrates threshold control behavior
6. **test_semantic_duplicate_exact_match_takes_precedence**
- Ensures exact hash duplicates are caught before semantic check
- Verifies error message indicates "exact match"
- Tests duplicate detection precedence order
### 2. Tag Normalization Tests (11 tests)
**File:** `tests/unit/test_memory_service.py`
Tests cover the `normalize_tags()` function and its integration in MemoryService:
#### Unit Tests for normalize_tags()
1. **test_normalize_tags_case_insensitive**
- Tests case normalization (Tag → tag, TAG → tag)
- Verifies deduplication across case variations
- Tests multiple tag scenarios
2. **test_normalize_tags_comma_separated**
- Tests comma-separated string parsing
- Verifies "Python,JAVA,JavaScript" → ["python", "java", "javascript"]
- Ensures proper deduplication
3. **test_normalize_tags_whitespace_handling**
- Tests leading/trailing whitespace removal
- Verifies comma-separated with spaces handled correctly
- Ensures clean tag output
4. **test_normalize_tags_none_and_empty**
- Tests None, empty string, and whitespace-only inputs
- Verifies all return empty list []
- Ensures robustness
5. **test_normalize_tags_preserves_order**
- Tests first occurrence order preservation
- Verifies ["zebra", "apple", "ZEBRA"] → ["zebra", "apple"]
- Ensures predictable output
6. **test_normalize_tags_non_string_elements**
- Tests filtering of non-string elements
- Verifies [123, None] are removed
- Ensures type safety
#### Integration Tests
7. **test_store_memory_deduplicates_tags**
- Tests tag deduplication in store_memory()
- Verifies tags and metadata tags are combined and deduplicated
- Ensures ["Test", "test", "PROJECT"] + metadata["project"] → ["another", "project", "test"]
8. **test_store_memory_preserves_tag_functionality**
- Tests that normalization doesn't break existing functionality
- Verifies mixed-case tags are normalized during storage
- Ensures backward compatibility
9. **test_store_memory_metadata_tags_normalized**
- Tests that tags from both parameters and metadata are normalized
- Verifies combined deduplication across sources
- Ensures consistent tag handling
10. **test_normalize_tags_with_search_by_tag**
- Tests tag normalization in search operations
- Verifies search with "Python" searches for "python"
- Ensures case-insensitive search behavior
11. **test_normalize_tags_integration_workflow**
- End-to-end test of tag normalization
- Tests comma-separated string + metadata tags
- Verifies no duplicate tags in final result
## Configuration Coverage
### Environment Variables Tested
**Semantic Deduplication:**
- `MCP_SEMANTIC_DEDUP_ENABLED` (true/false)
- `MCP_SEMANTIC_DEDUP_TIME_WINDOW_HOURS` (default: 24)
- `MCP_SEMANTIC_DEDUP_THRESHOLD` (default: 0.85, range: 0.0-1.0)
**Tag Normalization:**
- No configuration required (always enabled)
- Tests various input formats and edge cases
## Test Results
```bash
# Run semantic deduplication tests
pytest tests/test_sqlite_vec_storage.py::TestSemanticDeduplication -v
# Result: 6/6 passed ✅
# Run tag normalization tests
pytest tests/unit/test_memory_service.py::test_normalize_tags* -v
pytest tests/unit/test_memory_service.py::test_store_memory_*tags* -v
# Result: 11/11 passed ✅
# Run all tests in both files
pytest tests/test_sqlite_vec_storage.py tests/unit/test_memory_service.py -v
# Result: 99/99 passed ✅
```
## Key Features Tested
### Semantic Deduplication
- ✅ Detects semantically similar content (cosine similarity > threshold)
- ✅ Respects configurable time window (hours)
- ✅ Allows disabling via environment variable
- ✅ Works with configurable similarity threshold
- ✅ Exact hash duplicates take precedence
- ✅ Different content allowed
### Tag Normalization
- ✅ Case-insensitive deduplication (Tag = tag = TAG)
- ✅ Comma-separated string parsing
- ✅ Whitespace trimming
- ✅ Empty/None handling
- ✅ Order preservation
- ✅ Non-string filtering
- ✅ Integration with store_memory()
- ✅ Integration with search_by_tag()
- ✅ Metadata tag merging
## Files Modified
1. **tests/test_sqlite_vec_storage.py**
- Added `TestSemanticDeduplication` class with 6 tests
- Tests SQLite-vec storage backend deduplication logic
- Line count: +204 lines
2. **tests/unit/test_memory_service.py**
- Added 11 tag normalization tests
- Tests `normalize_tags()` function and MemoryService integration
- Line count: +173 lines
**Total Lines Added:** 377 lines of test code
## Verification Commands
```bash
# Run specific test groups
pytest tests/test_sqlite_vec_storage.py::TestSemanticDeduplication -xvs
pytest tests/unit/test_memory_service.py::test_normalize_tags_case_insensitive -xvs
# Run with coverage
pytest tests/test_sqlite_vec_storage.py tests/unit/test_memory_service.py --cov=src/mcp_memory_service --cov-report=html
# Run all new tests
pytest tests/test_sqlite_vec_storage.py::TestSemanticDeduplication \
tests/unit/test_memory_service.py::test_normalize_tags_case_insensitive \
tests/unit/test_memory_service.py::test_normalize_tags_comma_separated \
tests/unit/test_memory_service.py::test_normalize_tags_whitespace_handling \
tests/unit/test_memory_service.py::test_normalize_tags_none_and_empty \
tests/unit/test_memory_service.py::test_normalize_tags_preserves_order \
tests/unit/test_memory_service.py::test_normalize_tags_non_string_elements \
tests/unit/test_memory_service.py::test_store_memory_deduplicates_tags \
tests/unit/test_memory_service.py::test_store_memory_preserves_tag_functionality \
tests/unit/test_memory_service.py::test_store_memory_metadata_tags_normalized \
tests/unit/test_memory_service.py::test_normalize_tags_with_search_by_tag \
tests/unit/test_memory_service.py::test_normalize_tags_integration_workflow -v
```
## Success Criteria Met
✅ All new tests pass
✅ Existing tests still pass (99/99)
✅ Test coverage for semantic dedup and tag normalization
✅ Configuration behavior tested (environment variables)
✅ Edge cases covered (None, empty, non-string, etc.)
✅ Integration tests verify end-to-end workflows
## Notes
- Tests use temporary databases to avoid production interference
- Time window tests use `unittest.mock.patch` to simulate time passage
- Tag normalization is always-on (no disable flag needed)
- Semantic deduplication defaults to enabled but can be disabled
- All tests follow pytest conventions and use async fixtures where needed
