added test case to not send to unregistered users

src/server.js

@@ -11,6 +11,7 @@ const ERR_NONICKNAMEGIVEN = '431'
 const ERR_NICKNAMEINUSE = '433'
 const ERR_NEEDMOREPARAMS = '461'
 
+
 let server = {}
 
 server.create = function create(config = {}) {
@@ -76,8 +77,13 @@ server.create = function create(config = {}) {
                     case "PRIVMSG":
                         let target = userlist[tokenized[1]]
                         let message = tokenized[2]
+                        if (target.registered === false) {
+                            socket.write(`:irc.example.com ${ERR_NOSUCHNICK} ${target} no such nick/channel`)
 
+                        } else {
                             target.sendMsg(user, message)
+
+                        }
                         break;
                     case "QUIT":
                         server.closeConnection(user.nickname)

test/command_privmsg.js

@@ -60,6 +60,45 @@ describe("PRIVMSG OK", function () {
         mockedSock2.emit('data', Buffer.from("NICK other_nick\r\n", "ascii"))
         mockedSock2.emit('data', Buffer.from("USER guest tolmoon tolsun :Ronnie Reagan\r\n", "ascii"))
 
+        mockedSock1.emit('data', Buffer.from("PRIVMSG other_nick :I'm a message\r\n", "ascii"))
+    })
+    it("dont send message to unregistered user", function (done) {
+        const server = IRCServer.create()
+        let mockedSock1 = new EventEmitter()
+        mockedSock1.address = function () {
+            return {port: 12346, family: 'IPv4', address: '127.0.0.1'}
+        }
+        mockedSock1.write = function (data) {
+            answer = data.toString('ascii')
+            if (answer.indexOf("401")>=0) {
+                assert.equal(answer, ":irc.example.com 401 some_nick no such nick/channel")
+            }
+            done()
+        }
+        mockedSock1.destroy = function () {
+            done("Destroyed socket without answering")
+        }
+        let mockedSock2 = new EventEmitter()
+        mockedSock2.address = function () {
+            return {port: 12346, family: 'IPv4', address: '127.0.0.1'}
+        }
+        mockedSock2.write = function (data) {
+            let answer = data.toString("ascii")
+            if (answer.indexOf("PRIVMSG") >= 0) {
+                assert.equal(answer, ":some_nick PRIVMSG other_nick :I'm a message\r\n")
+                done("I got a message that I shouldn't have seen")
+            }
+        }
+        mockedSock2.destroy = function () {
+            done("Destroyed socket without answering")
+        }
+
+        server.emit("connection", mockedSock1)
+        server.emit("connection", mockedSock2)
+        mockedSock1.emit('data', Buffer.from("NICK some_nick\r\n", "ascii"))
+        mockedSock1.emit('data', Buffer.from("USER guest tolmoon tolsun :Ronnie Reagan\r\n", "ascii"))
+        mockedSock2.emit('data', Buffer.from("NICK other_nick\r\n", "ascii"))
+
         mockedSock1.emit('data', Buffer.from("PRIVMSG other_nick :I'm a message\r\n", "ascii"))
     })
 })