HeartbeatExtensionSerializer extends ExtensionSerializer<HeartbeatExtensionMessage> { @Override public byte[] serializeExtensionContent() { LOGGER.debug("Serializing HeartbeatExtensionMessage"); writeHeartbeatMode(msg); return getAlreadySerialized(); } HeartbeatExtensionSerializer(HeartbeatExtensionMessage message); @Override byte[] serializeExtensionContent();  }
@Test public void testSerializeExtensionContent() { }