From 1a2bdeb40920bdf89d3eda30265b42f377972454 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Sun, 25 Oct 2026 23:19:56 +0100
Subject: add random swarms test

---
 src/transport/sim.rs | 35 +++--------------------------------
 1 file changed, 3 insertions(+), 32 deletions(-)

(limited to 'src/transport')

diff --git a/src/transport/sim.rs b/src/transport/sim.rs
index 1556d69..ce5977f 100644
--- a/src/transport/sim.rs
+++ b/src/transport/sim.rs
@@ -26,6 +26,7 @@ use tracing::{debug, warn};
 
 use super::mycelium::{decode_message, encode_message};
 use super::{EncodedMessage, MessageHandler, MessageKind, ParsedMessage, Transport};
+use crate::testrand::Rng;
 
 /// How one direction of a link behaves.
 #[derive(Clone, Debug)]
@@ -72,7 +73,7 @@ pub(crate) struct NetCounts {
 }
 
 struct NetInner {
-    rng: SplitMix64,
+    rng: Rng,
     default_link: LinkParams,
     links: HashMap<(String, String), LinkParams>,
     down: HashSet<String>,
@@ -90,7 +91,7 @@ impl SimNet {
     pub(crate) fn new(seed: u64) -> Self {
         Self {
             inner: Arc::new(Mutex::new(NetInner {
-                rng: SplitMix64(seed),
+                rng: Rng::new(seed),
                 default_link: LinkParams::default(),
                 links: HashMap::new(),
                 down: HashSet::new(),
@@ -306,36 +307,6 @@ impl Transport for SimTransport {
     }
 }
 
-/// A small, seedable generator (SplitMix64): enough for network decisions, and no
-/// dependency.
-struct SplitMix64(u64);
-
-impl SplitMix64 {
-    fn next_u64(&mut self) -> u64 {
-        self.0 = self.0.wrapping_add(0x9e37_79b9_7f4a_7c15);
-        let mut z = self.0;
-        z = (z ^ (z >> 30)).wrapping_mul(0xbf58_476d_1ce4_e5b9);
-        z = (z ^ (z >> 27)).wrapping_mul(0x94d0_49bb_1331_11eb);
-        z ^ (z >> 31)
-    }
-
-    /// Uniform in [0, 1).
-    fn next_f64(&mut self) -> f64 {
-        (self.next_u64() >> 11) as f64 / (1_u64 << 53) as f64
-    }
-
-    fn chance(&mut self, probability: f64) -> bool {
-        probability > 0.0 && self.next_f64() < probability
-    }
-
-    fn duration_in(&mut self, (min, max): (Duration, Duration)) -> Duration {
-        if max <= min {
-            return min;
-        }
-        min + (max - min).mul_f64(self.next_f64())
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
-- 
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