### Question:
NetUtil { public static String getLocalHost() { InetAddress address = getLocalAddress(); return address == null ? "localhost" : address.getHostName(); }  static String toStringAddress(SocketAddress address); static String toIpAddress(SocketAddress address); static String toStringAddress(InetSocketAddress address); static InetSocketAddress toInetSocketAddress(String address); static long toLong(String address); static String getLocalIp(); static String getLocalHost(); static InetAddress getLocalAddress(); static void validAddress(InetSocketAddress address); static boolean isValidIp(String ip, boolean validLocalAndAny);  }### Answer:
@Test public void testGetLocalHost() { assertThat(NetUtil.getLocalHost()).isNotNull(); }