add coverage for fix #3766
add coverage for fix #3766

lsaffre/lino-welfare,lsaffre/lino-welfare,lino-framework/welfare,lino-framework/welfare,lino-framework/welfare,lino-framework/welfare,lsaffre/lino-welfare,lsaffre/lino-welfare,lsaffre/lino-welfare,lino-framework/welfare