Test Workbox-built service workers - pin behavior of the named recipes (`pageCache`, `staticResourceCache`, `imageCache`, `googleFontsCache`, `offlineFallback`, `warmStrategyCache`) per [developer.chrome.com/docs/workbox/modules/workbox-recipes][wb-recipes]; validate `workbox-precaching` manifest injection (`__WB_MANIFEST` revisioning); assert `workbox-routing` route handler matches; assert `workbox-expiration` and `workbox-cacheable-response` plugin gates; and verify the `workbox-window` registration helper events (`installed`, `waiting`, `controlling`, `activated`). Cache-strategy design (which strategy per route type, TTL + version-bump invalidation, migrating a hand-rolled sw.js to Workbox) lives in references/cache-strategy-design.md. Use when a project ships (or is adopting) a Workbox service worker and its strategy choices or recipe behavior need pinning against refactors or a version upgrade.