From bd50943234e74047b21c32ef3fdb96a313df5538 Mon Sep 17 00:00:00 2001
From: "Jamil Lambert, PhD" <Jamil.Lambert@proton.me>
Date: Thu, 19 Jun 2025 17:32:30 +0100
Subject: [PATCH] Add a roundtrip test to kill a mutant

There is a mutant found in relative locktime `to_512_second_intervals`.

Add a round trip test to kill the mutant.
---
 units/src/locktime/relative.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/units/src/locktime/relative.rs b/units/src/locktime/relative.rs
index 5edafe01e..ca2fbe8af 100644
--- a/units/src/locktime/relative.rs
+++ b/units/src/locktime/relative.rs
@@ -307,6 +307,13 @@ mod tests {
         assert_eq!(NumberOf512Seconds::from_512_second_intervals(1).to_seconds(), 512);
     }
 
+    #[test]
+    fn from_512_second_intervals_roundtrip() {
+        let intervals = 100_u16;
+        let locktime = NumberOf512Seconds::from_512_second_intervals(intervals);
+        assert_eq!(locktime.to_512_second_intervals(), intervals);
+    }
+    
     #[test]
     fn from_seconds_ceil_success() {
         let actual = NumberOf512Seconds::from_seconds_ceil(100).unwrap();