@Test
 public void testRepeated() {
   String[] arr = new String[10000];
   final String STR =
       "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
           + "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
   Arrays.fill(arr, STR);
   DualPivotQuicksort.sort(arr);
   assertTrue(Tests.isRepeated(arr, STR));
 }