Got session control into it's own layer.

src/session.rs

@@ -156,13 +156,19 @@ impl Session {
 }
 
 #[cfg(test)]
-mod sessions {
+pub mod sessions {
     use super::*;
     use crate::queue::{Message, MsgType};
     use std::{sync::mpsc::channel, time::Duration};
 
     static TIMEOUT: Duration = Duration::from_millis(500);
 
+    pub fn create_validated_reply(msg: Message) -> Message {
+        let mut reply = msg.reply(MsgType::SessionValidated);
+        reply.add_data("sess_id", Uuid::new_v4());
+        reply
+    }
+
     fn setup_session(listen_for: Vec<MsgType>) -> (Queue, Receiver<Message>) {
         let queue = Queue::new();
         let (tx, rx) = channel();