[tests] add a test for toolbar comboboxes
[tests] add a test for toolbar comboboxes

jonnylamb/mx,jonnylamb/mx,clutter-project/mx,clutter-project/mx,clutter-project/mx,clutter-project/mx,pwithnall/mx,jonnylamb/mx,pwithnall/mx,pwithnall/mx,jonnylamb/mx,pwithnall/mx