@Test
	public void testEnterKey_MatchingWindowClosed() {

		// no editing events should be triggered on ENTER press while the drop-down is open
		assertNoEditingStoppedEvent();
		assertNoEditingCancelledEvent();

		// make sure that the 'Enter' key press triggers works when there is no drop-down open
		enter();
		assertEditingStoppedEvent();
	}
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