Combobox: a few additions to unit test
Combobox: a few additions to unit test

tkrugg/deliteful,EAlexRojas/deliteful,brunano21/deliteful,cjolif/deliteful,kitsonk/deliteful,tkrugg/deliteful,cjolif/deliteful,harbalk/deliteful,EAlexRojas/deliteful,brunano21/deliteful,harbalk/deliteful,kitsonk/deliteful