diff --git a/src/message.rs b/src/message.rs
index c490337..0492f7a 100644
--- a/src/message.rs
+++ b/src/message.rs
@@ -122,7 +122,7 @@ mod msgactions {
         let value = DocDef::new();
         let result: MsgAction = value.into();
         match result {
-            MsgAction::Create(_) => {},
+            MsgAction::Create(_) => {}
             _ => unreachable!("Got {:?}: dhould have been create", result),
         }
     }
@@ -155,7 +155,7 @@ mod msgactions {
         let value = Access::new();
         let result: MsgAction = value.into();
         match result {
-            MsgAction::Query(_) => {},
+            MsgAction::Query(_) => {}
             _ => unreachable!("Got {:?}: dhould have been query", result),
         }
     }
@@ -165,7 +165,7 @@ mod msgactions {
         let value = Response::new();
         let result: MsgAction = value.into();
         match result {
-            MsgAction::Reply(_) => {},
+            MsgAction::Reply(_) => {}
             _ => unreachable!("Got {:?}: dhould have been reply", result),
         }
     }
@@ -981,11 +981,47 @@ impl Document {
 
 #[cfg(test)]
 mod documents {
-    use super::support_test::TIMEOUT;
-    use super::*;
+    use super::{support_test::TIMEOUT, *};
+    use std::sync::mpsc::RecvTimeoutError;
+
+    struct TestDoc {
+        queue: Queue,
+        rx: Receiver<Message>,
+    }
+
+    impl TestDoc {
+        fn new(name: &str, docdef: DocDef) -> Self {
+            let mut queue = Queue::new();
+            let msg = Message::new(name, docdef);
+            Document::start(queue.clone(), msg);
+            let (tx, rx) = channel();
+            let routes = [RouteRequest::new(Include::All, Include::All, Include::All)].to_vec();
+            queue.register(tx, name.to_string(), routes);
+            Self {
+                queue: queue,
+                rx: rx,
+            }
+        }
+
+        fn send(&self, msg: Message) -> Result<(), MTTError> {
+            match self.queue.send(msg) {
+                // Removes the just sent message from the queue.
+                Ok(_) => self.rx.recv_timeout(TIMEOUT).unwrap(),
+                Err(err) => return Err(err),
+            };
+            Ok(())
+        }
+
+        fn recv(&self) -> Result<Message, RecvTimeoutError> {
+            self.rx.recv_timeout(TIMEOUT)
+        }
+    }
 
     #[test]
     fn has_data_fields() {
+        let docdef = DocDef::new();
+        let name = "first";
+        let doc = TestDoc::new(name, docdef);
     }
 }