@Test
	public void testEnterKey_MatchingWindowOpen() {
		// insert some text and make sure the window is created
		typeText("d", true);

		// press the 'Enter' key; the window does not go away
		enter();
		assertMatchingWindowShowing();
		assetNoListSelection();
	}
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