From 8169fa2fe84b6e3944f7362d3e73ba763a2da1d9 Mon Sep 17 00:00:00 2001
From: Andrea Canciani <ranma42@gmail.com>
Date: Wed, 4 May 2016 12:08:11 +0200
Subject: [PATCH] Add test for `EscapeUnicode` specializations

---
 src/libcoretest/char.rs | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/src/libcoretest/char.rs b/src/libcoretest/char.rs
index 41fd742c9e011..e959e71daf73f 100644
--- a/src/libcoretest/char.rs
+++ b/src/libcoretest/char.rs
@@ -262,4 +262,37 @@ fn ed_iterator_specializations() {
     assert_eq!('\''.escape_default().last(), Some('\''));
 }
 
+#[test]
+fn eu_iterator_specializations() {
+    fn check(c: char) {
+        let len = c.escape_unicode().count();
+
+        // Check OoB
+        assert_eq!(c.escape_unicode().nth(len), None);
+
+        // For all possible in-bound offsets
+        let mut iter = c.escape_unicode();
+        for offset in 0..len {
+            // Check last
+            assert_eq!(iter.clone().last(), Some('}'));
 
+            // Check counting
+            assert_eq!(iter.clone().count(), len - offset);
+
+            // Check nth
+            assert_eq!(c.escape_unicode().nth(offset), iter.next());
+        }
+
+        // Check post-last
+        assert_eq!(iter.clone().last(), None);
+        assert_eq!(iter.clone().count(), 0);
+    }
+
+    check('\u{0}');
+    check('\u{1}');
+    check('\u{12}');
+    check('\u{123}');
+    check('\u{1234}');
+    check('\u{12340}');
+    check('\u{10FFFF}');
+}