Added test to make sure machine names are strings
Added test to make sure machine names are strings

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