rust/hedgewars-server/src/server/handlers/common.rs
author unc0rr
Mon, 10 Dec 2018 22:44:46 +0100
changeset 14436 06672690d71b
parent 14395 gameServer2/src/server/handlers/common.rs@e5db279308d7
child 14478 98ef2913ec73
permissions -rw-r--r--
Move rust server into rust folder
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use crate::{
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    server::{actions::Action, core::HWServer},
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    protocol::messages::{
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        HWProtocolMessage::{self, Rnd}, HWServerMessage::{self, ChatMsg},
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    }
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};
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use rand::{self, Rng, thread_rng};
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pub fn rnd_reply(options: &[String]) -> HWServerMessage {
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    let mut rng = thread_rng();
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    let reply = if options.is_empty() {
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        (*rng.choose(&["heads", "tails"]).unwrap()).to_owned()
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    } else {
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        rng.choose(&options).unwrap().clone()
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    };
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    ChatMsg {
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        nick: "[random]".to_owned(),
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        msg: reply.clone(),
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    }
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}
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#[cfg(test)]
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mod tests {
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    use super::*;
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    use crate::protocol::messages::HWServerMessage::ChatMsg;
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    use crate::server::actions::{
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        Action::{self, Send}, PendingMessage,
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    };
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    fn reply2string(r: HWServerMessage) -> String {
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        match r {
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            ChatMsg { msg: p, .. } => String::from(p),
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            _ => panic!("expected a ChatMsg"),
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        }
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    }
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    fn run_handle_test(opts: Vec<String>) {
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        let opts2 = opts.clone();
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        for opt in opts {
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            while reply2string(rnd_reply(&opts2)) != opt {}
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        }
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    }
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    /// This test terminates almost surely.
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    #[test]
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    fn test_handle_rnd_empty() {
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        run_handle_test(vec![])
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    }
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    /// This test terminates almost surely.
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    #[test]
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    fn test_handle_rnd_nonempty() {
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        run_handle_test(vec!["A".to_owned(), "B".to_owned(), "C".to_owned()])
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    }
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    /// This test terminates almost surely (strong law of large numbers)
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    #[test]
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    fn test_distribution() {
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        let eps = 0.000001;
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        let lim = 0.5;
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        let opts = vec![0.to_string(), 1.to_string()];
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        let mut ones = 0;
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        let mut tries = 0;
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        while tries < 1000 || ((ones as f64 / tries as f64) - lim).abs() >= eps {
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            tries += 1;
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            if reply2string(rnd_reply(&opts)) == 1.to_string() {
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                ones += 1;
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            }
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        }
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    }
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}