From d22ad76ca83acda1428829173451eee0221f685a Mon Sep 17 00:00:00 2001
From: Pazzaz <pazzaz.sundqvist@gmail.com>
Date: Sat, 16 Jun 2018 20:19:19 +0200
Subject: Optimize sum of Durations by using custom function

---
 src/libcore/tests/time.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'src/libcore/tests')

diff --git a/src/libcore/tests/time.rs b/src/libcore/tests/time.rs
index df139965753..466f28f0ef0 100644
--- a/src/libcore/tests/time.rs
+++ b/src/libcore/tests/time.rs
@@ -161,6 +161,20 @@ fn checked_div() {
     assert_eq!(Duration::new(2, 0).checked_div(0), None);
 }
 
+#[test]
+fn correct_sum() {
+    let durations = [
+        Duration::new(1, 999_999_999),
+        Duration::new(2, 999_999_999),
+        Duration::new(0, 999_999_999),
+        Duration::new(0, 999_999_999),
+        Duration::new(0, 999_999_999),
+        Duration::new(5, 0),
+    ];
+    let sum = durations.iter().sum::<Duration>();
+    assert_eq!(sum, Duration::new(1+2+5+4, 1_000_000_000 - 5));
+}
+
 #[test]
 fn debug_formatting_extreme_values() {
     assert_eq!(
-- 
cgit 1.4.1-3-g733a5