Testing Patterns Build confidence through strategic testing. Testing Philosophy The Testing Trophy What to Test | Test Type | What | Why | |-----------|------|-----| | Static | Types, lint rules | Catch errors at write-time | | Unit | Pure functions, utils | Fast, precise feedback | | Integration | Component + dependencies | Test contracts | | E2E | User flows | Confidence in real usage | What NOT to Test - Implementation details (internal state, private methods) - Third-party library internals - Constants and configuration - Framework code --- Unit Testing Structure: AAA Pattern Test Naming…