@Test
  public void testReplicateBlobFailureDueToSourceNodeFailure() throws Exception {
    // ON_DEMAND_REPLICATION_TODO:
    // Ideally we want to simulate source node down and target fails to replicate the Blob.
    // But for mock server, we mock the response with its own error setting. We don't check other server's error status.
  }
Test for ReplicateBlob failure when source is not available.
@throws Exception
ambry-router/src/test/java/com/github/ambry/router/NonBlockingRouterTest.java