libportal-tests-gtk4 binary package in Ubuntu Oracular i386

 libportal provides GIO-style C APIs for most Flatpak portals' D-Bus
 interfaces. It is primarily intended for installation in Flatpak runtimes,
 where applications can use it to interact with portals; it can also be
 used to test the portal services.
 .
 See the xdg-desktop-portal package's description for more information
 about portals.
 .
 This package contains the org.gnome.PortalTest.Gtk4 application, and
 will contain "as-installed" test programs if they are added.

Source package