ObjectUtils { public static String guid() { return guid(null); }  static String guid(); static String guid(
      final Object obj); static boolean equal(
      final Object obj1,
      final Object obj2); static int compare(
      final Comparable<T> o1,
      final T o2); static K nvl(
      final K... objs);  }
@Test public void testGuid() throws Exception { for (int i = 0; i < N_TEST; ++i) { assertNotNull(i + " th test", guid(this)); } }