Shift Left Testing

<default_to_action> When implementing early testing practices:

1. VALIDATE requirements before coding (testability, BDD scenarios)
2. WRITE tests before implementation (TDD red-green-refactor)
3. AUTOMATE in CI pipeline (every commit triggers tests)
4. FOLLOW test pyramid: Many unit (70%), some integration (20%), few E2E (10%)
5. 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
• Quality is built in, not tested in </default_to_action>

Quick Reference Card

When to Use

• Reducing cost of defects
• Implementing CI/CD pipelines