@Test
	public void testSetMatchingWindowHeight_MatchingWindowOpen() {

		typeText("d", true);

		int newSize = 200;
		runSwing(() -> textField.setMatchingWindowHeight(newSize));
		waitForSwing();

		JWindow matchingWindow = textField.getActiveMatchingWindow();
		Dimension windowSize = matchingWindow.getSize();
		assertEquals(newSize, windowSize.height);
	}
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