public void testDisconnect() { String message = MessageSS.disconnect(new Ipv4("0.0.0.0"), 1, 0); assertNotNull(message); assertNull(MessageSS.disconnect(null, 1, 0)); assertNull(MessageSS.disconnect(null, -1, 0)); assertNull(MessageSS.disconnect(new Ipv4("0.0.0.0"), null, 0)); }