# Testing Strategy - Top 50% Critical Functions

## 🎯 Testing Priorities

### **Tier 1: Core Critical Functions (Must Test)**
1. **Search Operations** - `SemanticSearchEngine.search()`
2. **Indexing Operations** - `SemanticIndexer.index_project()`, `index_file()`
3. **Database Operations** - `ChromaVectorDatabase.search()`, `add_chunks()`, `delete_by_file()`
4. **Connection Pooling** - `ChromaConnectionPool` lifecycle and performance
5. **Auto-Indexing** - `AutoIndexer.check_and_reindex_if_needed()`

### **Tier 2: Important Supporting Functions**
6. **Project Management** - `ProjectManager.initialize()`, `load_config()`
7. **Embedding Generation** - `create_embedding_function()`
8. **File Parsing** - Parser registry and language-specific parsers
9. **Component Factory** - `ComponentFactory.create_standard_components()`
10. **CLI Commands** - Main CLI entry points

### **Tier 3: Integration & E2E**
11. **Full Workflow** - Init → Index → Search → Reindex
12. **Auto-Indexing Strategies** - Git hooks, scheduled tasks, search-triggered
13. **Performance Benchmarks** - Connection pooling, search speed, indexing speed
14. **Error Handling** - Graceful degradation and recovery
15. **Configuration Management** - Config loading, validation, migration

## 📊 Test Coverage Goals

- **Unit Tests**: 90% coverage for Tier 1 functions
- **Integration Tests**: 80% coverage for Tier 2 functions  
- **E2E Tests**: 70% coverage for Tier 3 workflows
- **Performance Tests**: Benchmarks for all critical paths

## 🧪 Test Types

### **Unit Tests**
- Individual function testing with mocks
- Edge cases and error conditions
- Performance characteristics
- Input validation

### **Integration Tests**
- Component interaction testing
- Database integration
- File system operations
- Configuration management

### **End-to-End Tests**
- Complete user workflows
- CLI command testing
- Real file processing
- Performance validation

### **Performance Tests**
- Benchmark critical operations
- Memory usage validation
- Concurrent operation testing
- Scalability testing

## 📁 Test Organization

```
tests/
├── unit/                    # Unit tests
│   ├── core/               # Core module tests
│   │   ├── test_search.py
│   │   ├── test_indexer.py
│   │   ├── test_database.py
│   │   ├── test_connection_pool.py
│   │   ├── test_auto_indexer.py
│   │   └── test_factory.py
│   ├── parsers/            # Parser tests
│   │   ├── test_python_parser.py
│   │   ├── test_javascript_parser.py
│   │   └── test_registry.py
│   └── cli/                # CLI tests
│       ├── test_search_command.py
│       ├── test_index_command.py
│       └── test_auto_index_command.py
├── integration/            # Integration tests
│   ├── test_indexing_workflow.py
│   ├── test_search_workflow.py
│   ├── test_auto_indexing.py
│   └── test_project_management.py
├── e2e/                    # End-to-end tests
│   ├── test_full_workflow.py
│   ├── test_cli_commands.py
│   └── test_performance.py
├── fixtures/               # Test data
│   ├── sample_projects/
│   └── test_files/
└── conftest.py            # Pytest configuration
```

## 🔧 Test Infrastructure

### **Fixtures and Mocks**
- Temporary project directories
- Mock embedding functions
- In-memory databases for fast testing
- Sample code files for different languages

### **Test Utilities**
- Performance measurement helpers
- Assertion utilities for search results
- Database state validation
- File system helpers

### **CI/CD Integration**
- Automated test execution
- Performance regression detection
- Coverage reporting
- Test result visualization

## 📈 Success Metrics

### **Coverage Targets**
- **Line Coverage**: > 85%
- **Branch Coverage**: > 80%
- **Function Coverage**: > 90%

### **Performance Targets**
- **Search Speed**: < 10ms average
- **Indexing Speed**: > 500 files/minute
- **Memory Usage**: < 100MB for 1000 files
- **Connection Pool**: > 90% hit rate

### **Quality Targets**
- **Test Reliability**: > 99% pass rate
- **Test Speed**: < 30 seconds for full suite
- **Maintenance**: < 5% test code changes per feature

## 🚀 Implementation Plan

### **Phase 1: Core Unit Tests (Week 1)**
- Search engine tests
- Database operation tests
- Indexer functionality tests
- Connection pooling tests

### **Phase 2: Integration Tests (Week 2)**
- Component interaction tests
- Auto-indexing workflow tests
- CLI command tests
- Error handling tests

### **Phase 3: E2E & Performance (Week 3)**
- Full workflow tests
- Performance benchmarks
- Stress testing
- Documentation and CI integration

## 🔍 Test Examples

### **Unit Test Example**
```python
@pytest.mark.asyncio
async def test_search_basic_functionality():
    """Test basic search functionality."""
    # Setup
    mock_database = MockVectorDatabase()
    search_engine = SemanticSearchEngine(mock_database, Path("/test"))
    
    # Execute
    results = await search_engine.search("test query")
    
    # Assert
    assert len(results) > 0
    assert all(r.similarity_score >= 0.7 for r in results)
```

### **Integration Test Example**
```python
@pytest.mark.asyncio
async def test_indexing_search_workflow(temp_project):
    """Test complete indexing and search workflow."""
    # Setup project with real files
    components = await ComponentFactory.create_standard_components(temp_project)
    
    # Index project
    async with DatabaseContext(components.database):
        indexed_count = await components.indexer.index_project()
        assert indexed_count > 0
        
        # Search for content
        results = await components.search_engine.search("function")
        assert len(results) > 0
```

### **E2E Test Example**
```python
def test_cli_full_workflow(temp_project, cli_runner):
    """Test complete CLI workflow."""
    # Initialize project
    result = cli_runner.invoke(cli_app, ["init", str(temp_project)])
    assert result.exit_code == 0
    
    # Index project
    result = cli_runner.invoke(cli_app, ["index", str(temp_project)])
    assert result.exit_code == 0
    
    # Search project
    result = cli_runner.invoke(cli_app, ["search", "function", str(temp_project)])
    assert result.exit_code == 0
    assert "results" in result.output
```

## 🎯 Critical Test Scenarios

### **Search Engine Tests**
- Basic search functionality
- Similarity threshold handling
- Filter application
- Result ranking and enhancement
- Auto-reindex integration
- Error handling and recovery

### **Indexing Tests**
- File discovery and filtering
- Incremental vs force indexing
- Chunk generation and storage
- Metadata management
- Error handling for corrupted files
- Performance with large codebases

### **Database Tests**
- Connection management
- CRUD operations
- Query performance
- Connection pooling efficiency
- Concurrent access handling
- Data consistency

### **Auto-Indexing Tests**
- Staleness detection
- Threshold-based reindexing
- Strategy pattern implementation
- Git hooks integration
- Scheduled task management
- Search-triggered updates

### **Performance Tests**
- Search latency benchmarks
- Indexing throughput tests
- Memory usage profiling
- Connection pool efficiency
- Concurrent operation scaling
- Large dataset handling

This comprehensive testing strategy ensures we cover the most critical 50% of functions with appropriate test types and quality metrics.
