diff -r 2501428303a2 -r 914f9b970f4d gameServer2/src/server/handlers/common.rs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gameServer2/src/server/handlers/common.rs	Fri Jul 06 16:27:25 2018 +0200
@@ -0,0 +1,57 @@
+use protocol::messages::{
+    HWProtocolMessage::{self, Rnd}, HWServerMessage::ChatMsg,
+};
+use rand::{self, Rng};
+use server::{actions::Action, server::HWServer};
+
+pub fn rnd_reply(options: Vec<String>) -> Vec<Action> {
+    let options = if options.is_empty() {
+        vec!["heads".to_owned(), "tails".to_owned()]
+    } else {
+        options
+    };
+    let reply = rand::thread_rng().choose(&options).unwrap();
+    let msg = ChatMsg {
+        nick: "[random]".to_owned(),
+        msg: reply.clone(),
+    };
+    let msg = msg.send_all().action();
+    vec![msg]
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use protocol::messages::HWServerMessage::ChatMsg;
+    use server::actions::{
+        Action::{self, Send}, PendingMessage,
+    };
+
+    fn reply2string(mut r: Vec<Action>) -> String {
+        assert_eq!(r.len(), 1);
+        match r.remove(0) {
+            Send(PendingMessage {
+                message: ChatMsg { msg: p, .. },
+                ..
+            }) => String::from(p),
+            _ => panic!("reply should be a string"),
+        }
+    }
+
+    fn run_handle_test(opts: Vec<String>) {
+        let opts2 = opts.clone();
+        for opt in opts {
+            while reply2string(rnd_reply(opts2.clone())) != opt {}
+        }
+    }
+
+    #[test]
+    fn test_handle_rnd_empty() {
+        run_handle_test(vec![])
+    }
+
+    #[test]
+    fn test_handle_rnd_nonempty() {
+        run_handle_test(vec!["A".to_owned(), "B".to_owned(), "C".to_owned()])
+    }
+}