list_says_how_each_font_resolved expected Source Sans 3 Black to be a
substitute, which holds only while the bundled family is the only Source
Sans 3: on a machine with the full family installed (it ships with many
font packs), Black resolves exactly and the test failed. It now asks for
a style no Source Sans 3 has, so the substitute path is tested anywhere.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>