🎯 Test Coverage Strategy Analysis¶

📊 Current Coverage: 39% Total¶

High-Impact Coverage Targets (Low-hanging fruit for major improvements)¶

Module	Coverage	Missing Lines	Test File to Enhance	Priority
`datason/core.py`	54%	434 missing	`tests/edge_cases/test_core_edge_cases.py`	🔥 HIGH
`datason/deserializers.py`	42%	700 missing	`tests/edge_cases/test_deserializers_edge_cases.py`	🔥 HIGH
`datason/utils.py`	4%	408 missing	`tests/edge_cases/test_utils_edge_cases.py`	🔥 HIGH
`datason/cache_manager.py`	35%	134 missing	`tests/edge_cases/test_cache_edge_cases.py`	🔴 MEDIUM
`datason/ml_serializers.py`	31%	289 missing	`tests/edge_cases/test_ml_edge_cases.py`	🔴 MEDIUM

Already Well-Covered (Leave alone)¶

Module	Coverage	Status
`datason/api.py`	99%	✅ Perfect
`datason/converters.py`	100%	✅ Perfect
`datason/config.py`	93%	✅ Good
`datason/data_utils.py`	98%	✅ Perfect

🎯 Strategic Recommendations¶

Phase 1: Core Module Improvement (54% → 75%)¶

File: tests/edge_cases/test_core_edge_cases.py Missing Areas (lines 153-174, 267-305, 502-505, 574-576, etc.):

# Add tests for:
- ML framework serializer error paths
- Complex object serialization edge cases  
- Security limit enforcements
- Circular reference advanced scenarios
- Performance degradation paths

Phase 2: Deserializers Module (42% → 65%)¶

File: tests/edge_cases/test_deserializers_edge_cases.py Missing Areas (lines 289-648, 659-660, 715, 733-737, etc.):

# Add tests for:
- Template deserialization failures
- Type auto-detection edge cases
- Import failure scenarios
- Memory pressure deserialization
- Malformed data handling

Phase 3: Utils Module (4% → 35%)¶

File: tests/edge_cases/test_utils_edge_cases.py (NEW FILE) Missing Areas (almost everything):

# Add tests for:
- String processing utilities
- Type checking utilities  
- Data structure manipulation
- Error handling utilities
- Performance utilities

Phase 4: Cache Manager (35% → 60%)¶

File: tests/edge_cases/test_cache_edge_cases.py (NEW FILE) Missing Areas (lines 88, 94-111, 121-123, etc.):

# Add tests for:
- Cache eviction policies
- Memory pressure scenarios
- Concurrent access patterns
- Cache corruption recovery
- Performance degradation

Phase 5: ML Serializers (31% → 55%)¶

File: tests/edge_cases/test_ml_edge_cases.py (NEW FILE) Missing Areas (lines 40-44, 51-52, 63-67, etc.):

# Add tests for:
- ML framework compatibility edges
- Model state serialization failures
- GPU/CPU tensor edge cases
- Version compatibility issues
- Memory optimization paths

🚀 Implementation Strategy¶

Our Test Organization Rules¶

tests/
├── unit/              # Main functionality (already good: 99%+ api, 100% converters)
├── edge_cases/        # Coverage boosters (our target for improvements)  
└── integration/       # Cross-system tests

Where to Add Coverage Tests¶

Existing Files to Enhance:
tests/edge_cases/test_core_edge_cases.py ← Add 20-30 more edge case functions
tests/edge_cases/test_deserializers_edge_cases.py ← Add template & type detection edges
New Files to Create:
tests/edge_cases/test_utils_edge_cases.py ← NEW (huge impact: 4% → 35%)
tests/edge_cases/test_cache_edge_cases.py ← NEW (medium impact: 35% → 60%)
tests/edge_cases/test_ml_edge_cases.py ← NEW (ML-specific edges)

🎯 Target Outcome¶

Current: 39% total coverage
After Phase 1-2: ~55% total coverage
After Phase 3-5: ~70% total coverage

This follows our clean test organization where each major datason module has max 2-3 focused test files.