ONOS-4083,ONOS-4084:JUNIT for ISIS PDU TLV Data Structures

Change-Id: I0849d87ad1c7f9a8e08aabebd547dfd2dfde49df
diff --git a/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/isispacket/tlv/subtlv/SubTlvToBytes.java b/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/isispacket/tlv/subtlv/SubTlvToBytes.java
index 8774c04..8b41c4b 100644
--- a/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/isispacket/tlv/subtlv/SubTlvToBytes.java
+++ b/protocols/isis/isisio/src/main/java/org/onosproject/isis/io/isispacket/tlv/subtlv/SubTlvToBytes.java
@@ -60,6 +60,9 @@
         } else if (subTlv instanceof UnreservedBandwidth) {
             UnreservedBandwidth unreservedBandwidth = (UnreservedBandwidth) subTlv;
             subTlvBytes.addAll(Bytes.asList(unreservedBandwidth.asBytes()));
+        } else if (subTlv instanceof InterfaceIpAddress) {
+            InterfaceIpAddress interfaceIpAddress = (InterfaceIpAddress) subTlv;
+            subTlvBytes.addAll(Bytes.asList(interfaceIpAddress.asBytes()));
         } else {
             log.debug("TlvsToBytes::UNKNOWN TLV TYPE ::TlvsToBytes ");
         }