public void testUserRoot() throws BackingStoreException {
Preferences p = Preferences.userRoot();
assertTrue(p instanceof AbstractPreferences);
assertEquals("/", p.absolutePath());
assertSame(null, p.parent());
assertTrue(p.isUserNode());
assertEquals("", p.name());
assertEquals("User Preference Node: " + p.absolutePath(), p.toString());
// assertEquals(0, p.childrenNames().length);
// assertEquals(p.keys().length, 0);