Started making a cucumber test for allchat.

Will need to incorporate mockito in order to mock controller input. Have commented out the tests as they are not working correctly yet.

 #story[1246]

src/main/java/seng302/visualiser/ClientToServerThread.java

@@ -303,7 +303,7 @@ public class ClientToServerThread implements Runnable {
         }
     }
 
-    private void closeSocket() {
+    public void closeSocket() {
         try {
             socket.close();
             socketOpen = false;