Add ability to join channel with multiple users

Joining channels allone is nice, but defeats the purpose of channels.
This patch adds the ability to join a channel with multiple users.

src/channel.js

@@ -3,8 +3,11 @@ function Channel(name) {
   this.userlist = []
 
   this.join = function(user) {
+    let channel = this
     this.userlist.push(user)
-    user.sendRaw(`:${user.nickname} JOIN ${this.name}`)
+    this.userlist.forEach(function(item) {
+      item.sendRaw(`:${user.nickname} JOIN ${channel.name}`)
+    })
   }
 }
 

src/server.js

@@ -89,9 +89,14 @@ server.create = function create(config = {}) {
                         break;
                     case "JOIN":
                         let channelname = tokenized[1]
+                        if (Object.keys(channellist).includes(channelname)) {
+                          channellist[channelname].join(user)
+                        } else {
                           let channel = new Channel(channelname)
                           channel.join(user)
                           channellist[channelname] = channel
+                        }
+
                         break;
                     case "QUIT":
                         server.closeConnection(user.nickname)

test/command_join.js

@@ -25,4 +25,48 @@ describe("JOIN OK", function () {
         mockedSock.emit('data', Buffer.from("USER guest tolmoon tolsun :Ronnie Reagan\r\n", "ascii"))
         mockedSock.emit('data', Buffer.from("JOIN #testchan\r\n", "ascii"))
     })
+
+    it("should handle a JOIN command for more than one user -> JOIN #testchan and send join events to all channel members", function (done) {
+        const server = IRCServer.create()
+        // helper to count join messages for channel
+        // we should see 2 of them
+        let counter = 0
+        let mockedSock1 = new EventEmitter()
+        mockedSock1.address = function () {
+            return {port: 12346, family: 'IPv4', address: '127.0.0.1'}
+        }
+        mockedSock1.write = function (data) {
+            let answer = data.toString("ascii")
+            if (answer.indexOf("JOIN") >= 0 && counter === 1) {
+                assert.equal(answer, ":other_nick JOIN #testchan\r\n")
+                done()
+            }
+            if (answer === ":some_nick JOIN #testchan\r\n") {
+              counter++
+            }
+        }
+        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) {
+            return
+        }
+        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"))
+        mockedSock1.emit('data', Buffer.from("JOIN #testchan\r\n", "ascii"))
+        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"))
+        mockedSock2.emit('data', Buffer.from("JOIN #testchan\r\n", "ascii"))
+    })
 })