@Test
	public void testDropdownLocationOnResize() {

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

		JWindow matchingWindow = textField.getActiveMatchingWindow();
		Dimension windowSize = matchingWindow.getSize();
		Dimension size = parentFrame.getSize();
		Dimension newSize = new Dimension(size.width - 50, size.height);

		runSwing(() -> parentFrame.setSize(newSize));
		waitForSwing();

		// we have to wait here; it seems like that there may be an 'invokeLater' happening
		// in the Swing components
		waitForCondition(() -> !windowSize.equals(matchingWindow.getSize()),
			"The completion window's size did not update when its parent window was resized.");
	}
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