yusyus eff6673c89 test: Add comprehensive Week 2 feature validation suite ...

Add automated test suite and testing guide for all Week 2 features.

**Test Suite (test_week2_features.py):**
- Automated validation for all 6 feature categories
- Quick validation script (< 5 seconds)
- Clear pass/fail indicators
- Production-ready testing

**Tests Included:**
1. ✅ Vector Database Adaptors (4 formats)
   - Weaviate, Chroma, FAISS, Qdrant
   - JSON format validation
   - Metadata verification

2. ✅ Streaming Ingestion
   - Large document chunking
   - Overlap preservation
   - Memory-efficient processing

3. ✅ Incremental Updates
   - Change detection (added/modified/deleted)
   - Version tracking
   - Hash-based comparison

4. ✅ Multi-Language Support
   - 11 language detection
   - Filename pattern recognition
   - Translation status tracking

5. ✅ Embedding Pipeline
   - Generation and caching
   - 100% cache hit rate validation
   - Cost tracking

6. ✅ Quality Metrics
   - 4-dimensional scoring
   - Grade assignment
   - Statistics calculation

**Testing Guide (docs/WEEK2_TESTING_GUIDE.md):**
- 7 comprehensive test scenarios
- Step-by-step instructions
- Expected outputs
- Troubleshooting section
- Integration test examples

**Results:**
- All 6 tests passing (100%)
- Fast execution (< 5 seconds)
- Production-ready validation
- User-friendly output

**Usage:**
```bash
# Quick validation
python test_week2_features.py

# Full testing guide
cat docs/WEEK2_TESTING_GUIDE.md
```

**Exit Codes:**
- 0: All tests passed
- 1: One or more tests failed

2026-02-07 14:14:37 +03:00

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