https://bugzilla.redhat.com/show_bug.cgi?id=2173677
--- Comment #12 from Vasiliy Glazov vascom2@gmail.com --- Need to add BuildRequires: libappstream-glib
And to %check section add:
desktop-file-validate %{buildroot}%{_datadir}/applications/com.github.artemanufrij.regextester.desktop appstream-util validate-relax --nonet %{buildroot}%{_datadir}/metainfo/com.github.artemanufrij.regextester.appdata.xml