@Test
 public void testContainsNonPresentMessageTTL() {
   assertFalse(
       "checking containsMetricTTL for absent message ID",
       _metadataRepo.containsMetricTTL(new UOID()));
 }
 @Test
 public void testRemoveAvailableMessage() {
   _metadataRepo.remove(AVAILABLE_ID);
   assertFalse("Checking availablity after remove", _metadataRepo.containsMetricTTL(AVAILABLE_ID));
 }
 @Test
 public void testContainsPresentMessageTTL() {
   assertTrue(
       "checking containsMetricTTL for available message ID",
       _metadataRepo.containsMetricTTL(AVAILABLE_ID));
 }