public void test(TestHarness harness)
{
JFileChooser fc = new JFileChooser();
BasicFileChooserUI ui = new BasicFileChooserUI(fc);
harness.check(ui.getDirectoryName(), null);
ui.installUI(fc);
harness.check(ui.getDirectoryName(), null);
ui.setDirectoryName("XYZ");
harness.check(ui.getDirectoryName(), null);
fc.setCurrentDirectory(new File("ABC"));
harness.check(ui.getDirectoryName(), null);