shift-left-testing
Shift-Left Testing
<default_to_action> When implementing early testing practices:
- VALIDATE requirements before coding (testability, BDD scenarios)
- WRITE tests before implementation (TDD red-green-refactor)
- AUTOMATE in CI pipeline (every commit triggers tests)
- FOLLOW test pyramid: Many unit (70%), some integration (20%), few E2E (10%)
- FIX defects immediately - never let them accumulate
Quick Shift-Left Levels:
- Level 1: Unit tests with each PR (developer responsibility)
- Level 2: TDD practice (tests before code)
- Level 3: BDD/Example mapping in refinement (requirements testing)
- Level 4: Risk analysis in design (architecture testing)
Critical Success Factors:
- Defects found in requirements cost 1x; in production cost 100x
- Every commit must run automated tests
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