### Question:
InventoryHelper { public static Long getLongFromDpid(String dpid) { String[] addressInBytes = dpid.split(":"); Long address = (Long.decode(HEX + addressInBytes[2]) << 40) | (Long.decode(HEX + addressInBytes[3]) << 32) | (Long.decode(HEX + addressInBytes[4]) << 24) | (Long.decode(HEX + addressInBytes[5]) << 16) | (Long.decode(HEX + addressInBytes[6]) << 8) | (Long.decode(HEX + addressInBytes[7])); return address; }  static Long getLongFromDpid(String dpid); static String getInventoryNodeIdString(OvsdbBridgeAugmentation ovsdbBridge,
            InstanceIdentifier<OvsdbTerminationPointAugmentation> ovsdbTpIid, DataBroker dataBroker); static String getInventoryNodeConnectorIdString(String inventoryNodeId,
            OvsdbTerminationPointAugmentation ovsdbTp, InstanceIdentifier<OvsdbTerminationPointAugmentation> tpIid,
            DataBroker dataBroker); static boolean checkOfOverlayConfig(String nodeIdString, List<AbstractTunnelType> requiredTunnelTypes,
            DataBroker dataBroker); static InstanceIdentifier<ExternalInterfaces> addOfOverlayExternalPort(NodeId nodeId, NodeConnectorId ncId,
        DataBroker dataBroker); static OfOverlayNodeConfig getOfOverlayConfig(String nodeIdString, DataBroker dataBroker); static void updateOfOverlayConfig(IpAddress ip, String nodeIdString, String nodeConnectorIdString,
            AbstractTunnelType tunnelType, DataBroker dataBroker); static void removeTunnelsOfOverlayConfig(String nodeIdString,
                                                    List<AbstractTunnelType> tunnels,
                                                    DataBroker dataBroker);  }### Answer:
@Test public void testGetLongFromDpid() { String dpid = "FF:FF:FF:FF:FF:FF:FF:FF"; Long result = InventoryHelper.getLongFromDpid(dpid); assertEquals(Long.valueOf(281474976710655L), result); }