Added test for default delta handler
Added test for default delta handler

jrwren/juju-gui,bac/juju-gui,jrwren/juju-gui,bac/juju-gui,mitechie/juju-gui,jrwren/juju-gui,bac/juju-gui,mitechie/juju-gui,bac/juju-gui,mitechie/juju-gui,jrwren/juju-gui,mitechie/juju-gui