### Question:
NetUtils { public static InetAddress getLocalAddress() { if (LOCAL_ADDRESS != null) { return LOCAL_ADDRESS; } InetAddress localAddress = getLocalAddress0(); LOCAL_ADDRESS = localAddress; return localAddress; }  static int getRandomPort(); static int getAvailablePort(); static int getAvailablePort(int port); static boolean isInvalidPort(int port); static boolean isValidAddress(String address); static boolean isLocalHost(String host); static boolean isAnyHost(String host); static boolean isInvalidLocalHost(String host); static boolean isValidLocalHost(String host); static InetSocketAddress getLocalSocketAddress(String host, int port); static String getLocalHost(); static String filterLocalHost(String host); static InetAddress getLocalAddress(); static String getHostName(String address); static String getIpByHost(String hostName); static String toAddressString(InetSocketAddress address); static InetSocketAddress toAddress(String address); static String toURL(String protocol, String host, int port, String path);  }### Answer:
@Test public void testGetLocalAddress() throws Exception { InetAddress address = NetUtils.getLocalAddress(); assertNotNull(address); assertTrue(NetUtils.isValidLocalHost(address.getHostAddress())); }