PASS Setup worker
PASS FetchEvent respondWith should throw if called twice
PASS FetchEvent request is SameObject
PASS FetchEvent should be in error if responding with undefined
PASS FetchEvent should be in error if not responding with a Response
PASS FetchEvent should be in error if responding with a Promise that does not resolve to a Response
PASS FetchEvent should be in error if responding with a Promise that rejects
PASS FetchEvent should resolve when responding with a Response