From d33cc12eed3df459db3c9ae2dd89df9cc6e45dd6 Mon Sep 17 00:00:00 2001
From: oberien <jaro.fietz@gmx.de>
Date: Fri, 19 Jan 2018 14:55:34 +0100
Subject: [PATCH] Unit Tests

---
 src/libcore/tests/iter.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/libcore/tests/iter.rs b/src/libcore/tests/iter.rs
index 8997cf9c6bff..e88749916596 100644
--- a/src/libcore/tests/iter.rs
+++ b/src/libcore/tests/iter.rs
@@ -161,6 +161,24 @@ fn test_iterator_step_by() {
     assert_eq!(it.next(), None);
 }
 
+#[test]
+fn test_iterator_step_by_nth() {
+    let mut it = (0..16).step_by(5);
+    assert_eq!(it.nth(0), Some(0));
+    assert_eq!(it.nth(0), Some(5));
+    assert_eq!(it.nth(0), Some(10));
+    assert_eq!(it.nth(0), Some(15));
+    assert_eq!(it.nth(0), None);
+
+    let it = (0..18).step_by(5);
+    assert_eq!(it.clone().nth(0), Some(0));
+    assert_eq!(it.clone().nth(1), Some(5));
+    assert_eq!(it.clone().nth(2), Some(10));
+    assert_eq!(it.clone().nth(3), Some(15));
+    assert_eq!(it.clone().nth(4), None);
+    assert_eq!(it.clone().nth(42), None);
+}
+
 #[test]
 #[should_panic]
 fn test_iterator_step_by_zero() {