public void testUninstallDefaults() {
JRadioButton button = new JRadioButton();
UIManager.put("RadioButton.foreground", new ColorUIResource(Color.cyan));
UIManager.put("RadioButton.background", new ColorUIResource(Color.blue));
assertNotNull("font is installed", button.getFont());
Font font = new FontUIResource(button.getFont().deriveFont(100f));
UIManager.put("RadioButton.font", font);
Border border = new BorderUIResource(BorderFactory.createEmptyBorder(0, 0, 0, 0));
UIManager.put("RadioButton.border", border);
Insets margin = new InsetsUIResource(10, 20, 30, 40);
UIManager.put("RadioButton.margin", margin);