Testing Mastery — Unified Testing Skill

Write tests that document intent, catch regressions, and run fast. Choose the right strategy for the right situation.

Decision Tree: Which Testing Strategy?

Is this a new feature?
├─ YES → Use TDD (see references/tdd-cycle.md)
│        Write failing test → Minimal code → Refactor
└─ NO
   ├─ Is this a bug fix?
   │  └─ YES → Write regression test first, then fix
   ├─ Is this a critical user flow (login, checkout)?
   │  └─ YES → E2E test (see references/e2e-playwright.md)
   └─ Is this business logic / data transformation?
      └─ YES → Unit + Integration tests (see references/unit-integration.md)