3.4Format 3: System Design for Testing

Senior and architect-level interviews may ask you to design a test automation framework from scratch.

"Design a test automation framework for an e-commerce platform."

Structure your answer in layers:

Layer 5: Reporting & Analytics
    Test reports, dashboards, trend analysis, Slack/email notifications

Layer 4: CI/CD Integration
    GitHub Actions pipeline, parallel execution, quality gates, artifact storage

Layer 3: Test Suites
    Smoke (5 min), Regression (30 min), Full (2 hr), Performance (1 hr)

Layer 2: Test Infrastructure
    Page Objects, API clients, test data factory, fixtures, utilities

Layer 1: Frameworks & Tools
    Playwright (browser), pytest/requests (API), k6 (performance), axe-core (accessibility)

Key design decisions to discuss:

• Why Playwright over Selenium: Auto-waiting, built-in API testing, better TypeScript support, multi-browser without extra drivers (Chapter 13)
• Test data strategy: Factory pattern for creating test data, API-based setup instead of UI, cleanup in afterEach hooks
• Parallelization: Sharding by test file, independent test data per shard, shared nothing architecture
• Environment management: Configuration per environment, secrets management, feature flags for test control
• Reporting: HTML reports stored as CI artifacts, Slack notification on failure, trend dashboard in Grafana