test-master

Complete Vitest 4.0 Playwright 1.55 MSW 2.x testing system. PROACTIVELY activate for: (1) ANY testing task (unit/integration/E2E/visual), (2) Test creation and scaffolding, (3) AI-powered test generation (Playwright agents), (4) Test debugging and failure analysis, (5) Coverage analysis and optimization, (6) Visual regression testing, (7) MSW mock management, (8) Test configuration (Vitest/Playwright), (9) CI/CD test setup, (10) Multi-project test architecture. Provides: Vitest 4.0 stable browser mode, visual regression testing, Playwright 1.55 AI test agents, intelligent test running, auto-scaffolding with boilerplate, MSW 2.11+ handler generation, coverage gap analysis, Playwright trace debugging with titlePath, advanced snapshot management, parallel execution optimization, and comprehensive test infrastructure setup. Ensures production-ready testing with latest 2025 patterns across all modern JavaScript projects.