Service Worker has multiple kinds of tests: Content Browser Tests, WebKit Unit Tests, Telemetry Performance Tests, and Blink Layout Tests. Performance Tests Issue 372759 is tracking the development of Service Worker performance tests. How to run the performance tests: Build and install the content_shell_apk target per the Android build ...
To poke around at the internals (usually only Chromium developers should need this), visit chrome://serviceworker-internals . Q: When I have Developer Tools open, requests go straight to the network; the Service Worker does not get a fetch event.