+ InstanceIdentifierBuilder<VpnNexthops> idBuilder =
+ InstanceIdentifier.builder(L3nexthop.class).child(VpnNexthops.class, new VpnNexthopsKey(vpnId));
+ InstanceIdentifier<VpnNexthops> id = idBuilder.build();
+ doReturn(Futures.immediateCheckedFuture(Optional.absent())).when(mockReadTx).read(LogicalDatastoreType.OPERATIONAL,id);