@Test
	public void testNavigationKeys_UpArrow_NoSelectionTriggered() {

		// insert some text and make sure the window is created
		typeText("d", true);

		up();
		assertNoSelectedListItem();

		// repeated presses will cycle through the list when selections are enabled; they 
		// should do nothing when selections are disabled
		up();
		assertNoSelectedListItem();
	}
This test achieves partial coverage of {@link DropDownTextField}.  Further coverage is
provided by {@link DropDownSelectionTextFieldTest}, as that test enables item selection 
in the widget being tested.
Ghidra/Framework/Docking/src/test/java/docking/widgets/DropDownTextFieldTest.java