1. 1. Cookbook Overview
2. 2. Introduction
3. 3. Testing Patterns
4. 1. 3.1. Pattern 1: AAA Pattern
   2. 3.2. Pattern 2: Error Path Testing
   3. 3.3. Pattern 3: Boundary Conditions
   4. 3.4. Pattern 4: Resource Cleanup
   5. 3.5. Pattern 5: Real Collaborators
5. 4. Architecture Patterns
6. 1. 4.1. Pattern 6: Generic Base Layer
   2. 4.2. Pattern 7: Extension Layer
   3. 4.3. Pattern 8: Composition Over Duplication
   4. 4.4. Pattern 9: Single Source of Truth
   5. 4.5. Pattern 10: Capability Grouping
7. 5. Design Patterns
8. 1. 5.1. Pattern 11: Zero-Cost Abstractions
   2. 5.2. Pattern 12: Type Safety with GATs
   3. 5.3. Pattern 13: Sealed Traits for API Safety
   4. 5.4. Pattern 14: Compile-Time Validation
   5. 5.5. Pattern 15: Type State Enforcement
9. 6. New Patterns from Practice
10. 1. 6.1. Pattern 16: Fixture Lifecycle Management
    2. 6.2. Pattern 17: Builder-Driven Test Data
    3. 6.3. Pattern 18: Timeout Defense in Depth
    4. 6.4. Pattern 19: Feature Gate Slices
    5. 6.5. Pattern 20: Macro Pattern Enforcement