@Test(expected = QuorumException.class)
 public void testGetAllOperationThrowsExceptionWhenQuorumSizeNotMet() {
   HashSet<Integer> hashSet = new HashSet<Integer>();
   hashSet.add(123);
   cache4.getAll(hashSet);
 }
 @Test
 public void testGetAllOperationSuccessfulWhenQuorumSizeMet() {
   HashSet<Integer> hashSet = new HashSet<Integer>();
   hashSet.add(123);
   cache1.getAll(hashSet);
 }