Extension Testing

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Testing Layer Architecture

Unit Tests (Jest)          → Test isolated logic, chrome.* API mocks
Integration Tests (Jest)   → Test service interactions, message passing
E2E Tests (Puppeteer)      → Test in real Chrome with extension loaded

Critical constraint: Extensions CANNOT run in headless mode. E2E requires headless: false or Chrome's --headless=new (Chrome 112+).

Layer 1: Unit + Integration (Jest)