Add a test for builtin icons
Add a test for builtin icons

We want to get rid of these, but as long as we still have them,
make sure they work.

alexlarsson/gtk,grubersjoe/adwaita,jadahl/gtk,jessevdk/gtk,Lyude/gtk-,jigpu/gtk,grubersjoe/adwaita,jigpu/gtk,chergert/gtk,alexlarsson/gtk,davidgumberg/gtk,jadahl/gtk,jadahl/gtk,Adamovskiy/gtk,chergert/gtk,ahodesuka/gtk,Adamovskiy/gtk,jadahl/gtk,ahodesuka/gtk,jigpu/gtk,jessevdk/gtk,grubersjoe/adwaita,ahodesuka/gtk,ahodesuka/gtk,jessevdk/gtk,Lyude/gtk-,chergert/gtk,Adamovskiy/gtk,alexlarsson/gtk,Adamovskiy/gtk,jadahl/gtk,alexlarsson/gtk,jessevdk/gtk,chergert/gtk,jigpu/gtk,grubersjoe/adwaita,grubersjoe/adwaita,davidgumberg/gtk,Adamovskiy/gtk,ahodesuka/gtk,ahodesuka/gtk,davidgumberg/gtk,Lyude/gtk-,alexlarsson/gtk,Lyude/gtk-,chergert/gtk,chergert/gtk,jessevdk/gtk,grubersjoe/adwaita,alexlarsson/gtk,ahodesuka/gtk,Lyude/gtk-,Lyude/gtk-,jadahl/gtk,alexlarsson/gtk,grubersjoe/adwaita,jessevdk/gtk,grubersjoe/adwaita,jessevdk/gtk,davidgumberg/gtk,davidgumberg/gtk,Adamovskiy/gtk,alexlarsson/gtk,davidgumberg/gtk,chergert/gtk,davidgumberg/gtk,jigpu/gtk,jigpu/gtk,jigpu/gtk,ahodesuka/gtk,jadahl/gtk,chergert/gtk,jigpu/gtk,Adamovskiy/gtk,jadahl/gtk,Adamovskiy/gtk,Lyude/gtk-,davidgumberg/gtk,Lyude/gtk-