sulthan
78eaecb119
Extend the test harness's document stub with a querySelectorAll("img[alt]")
fake (module-level pageImages fixture, mirroring metaTags), then assert on
p.cover for a matching alt and for no match. Previously the guard in
coverFromPage() always short-circuited under test since querySelectorAll
didn't exist on the stub, so the alt-matching loop had zero coverage.