Removed send once session test.

src/lib.rs

@@ -23,11 +23,15 @@ impl MoreThanText {
         }
     }
 
-    pub fn request<F>(&mut self, _session: Option<F>) -> Reply
+    pub fn request<F>(&mut self, session: Option<F>) -> Reply
     where
         F: Into<Field>,
     {
-        let req = Request::new(None);
+        let sess = match session {
+            Some(id) => Some(id.into()),
+            None => None,
+        };
+        let req = Request::new(sess);
         let rx = self.client_link.send(req);
         rx.recv().unwrap()
     }