Don't use assertIsInstance (for pass py26); add failing checks
Don't use assertIsInstance (for pass py26); add failing checks

pjs7678/eve,sebest/eve,kidaa/eve,mcreenan/eve,jzorrof/eve,hustlzp/eve,mugurrus/eve,EasonYi/eve,stratosgear/eve,amagdas/eve,eduardomb/eve,superdesk/eve,elpoisterio/eve,julianhille/eve,yanyanqin/eve,matthieuprat/eve,bcrochet/eve,kalbasit/eve,opticode/eve