@Test
  public void singleBlobThroughTtlManagerTest() throws Exception {
    for (String blobId : blobIds) {
      assertTtl(router, Collections.singleton(blobId), TTL_SECS);
      executeOpAndVerify(Collections.singleton(blobId), null, false, false, false, true, false);
      // ok to do it again
      executeOpAndVerify(Collections.singleton(blobId), null, false, false, false, true, false);
    }
  }
Test where TTL update is done for a single blob at a time.
@throws Exception
ambry-router/src/test/java/com/github/ambry/router/TtlUpdateManagerTest.java