This test creates an editable JComboBox populated by JTable cell editor with 3 items. Originally, the first item is visible in the text field of the combo.
Then robot hits VK_DOWN twice expecting that the first hit would open dropdown and the second would selects the second item in the list. This is the regular JComboBox behavior (see SwingSet2 for instance: it work just like this in all LaFs).

What happens on Unity is, the dropdown opens but a selected, therefore a preselected, item is not 1st but 3rd (last added probably). The second keyboard hit does nothing, there's only 3 items.
Test fails on Unity with jdk9 b111 and up to now.

Note that on Ubuntu 14.04 with Xfce4 the test does pass.


RULE "javax/swing/JComboBox/6559152/bug6559152.java" Exception java.lang.RuntimeException: Cannot select an item from popup with the ENTER key.