@Override
 public void testCreateUI() {
   assertTrue("created UI is not null", null != MetalCheckBoxUI.createUI(new JButton()));
   assertTrue(
       "created UI is of the proper class",
       MetalCheckBoxUI.createUI(null) instanceof MetalCheckBoxUI);
   assertTrue(
       "created UI is not shared",
       MetalCheckBoxUI.createUI(null) == MetalCheckBoxUI.createUI(null));
 }
 @Override
 public void uninstallDefaults(final AbstractButton b) {
   super.uninstallDefaults(b);
 }