### Question:
NetUtils { public static int getRandomPort() { return RND_PORT_START + RANDOM.nextInt(RND_PORT_RANGE); }  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 testGetRandomPort() throws Exception { assertThat(NetUtils.getRandomPort(), greaterThanOrEqualTo(30000)); assertThat(NetUtils.getRandomPort(), greaterThanOrEqualTo(30000)); assertThat(NetUtils.getRandomPort(), greaterThanOrEqualTo(30000)); }