Got session control into it's own layer.

src/document.rs

@@ -43,13 +43,17 @@ impl Document {
 }
 
 #[cfg(test)]
-mod documents {
+pub mod documents {
     use super::*;
     use std::time::Duration;
     use uuid::Uuid;
 
     const TIMEOUT: Duration = Duration::from_millis(500);
 
+    pub fn get_root_document() -> Message {
+        Message::new(MsgType::DocumentRequest)
+    }
+
     fn setup_document(listen_for: Vec<MsgType>) -> (Queue, Receiver<Message>) {
         let queue = Queue::new();
         let (tx, rx) = channel();