Complete the tests

Author: ticki

src/libcore/char.rs

@@ -588,21 +588,43 @@ impl Iterator for EscapeDefault {
 fn ed_iterator_specializations() {
     use super::EscapeDefault;
 
-    /// Check counting
+    // Check counting
     assert_eq!('\n'.escape_default().count(), 2);
     assert_eq!('c'.escape_default().count(), 1);
     assert_eq!(' '.escape_default().count(), 1);
     assert_eq!('\\'.escape_default().count(), 2);
+    assert_eq!('\''.escape_default().count(), 2);
+
+    // Check nth
+
+    // Check that OoB is handled correctly
+    assert_eq!('\n'.escape_default().nth(2), None);
+    assert_eq!('c'.escape_default().nth(1), None);
+    assert_eq!(' '.escape_default().nth(1), None);
+    assert_eq!('\\'.escape_default().nth(2), None);
+    assert_eq!('\''.escape_default().nth(2), None);
+
+    // Check the first char
+    assert_eq!('\n'.escape_default().nth(0), Some('\\'));
+    assert_eq!('c'.escape_default().nth(0), Some('c'));
+    assert_eq!(' '.escape_default().nth(0), Some(' '));
+    assert_eq!('\\'.escape_default().nth(0), Some('\\'));
+    assert_eq!('\''.escape_default().nth(0), Some('\\'));
+
+    // Check the second char
+    assert_eq!('\n'.escape_default().nth(1), Some('n'));
+    assert_eq!('\\'.escape_default().nth(1), Some('\\'));
+    assert_eq!('\''.escape_default().nth(1), Some('\''));
 }
 
 
 impl EscapeDefault {
     fn get_offset(&self) -> Option<usize> {
         match self.state {
-            EscapeDefaultState::Backslash(c)          => Some(0),
-            EscapeDefaultState::Char(c)               => Some(1),
-            EscapeDefaultState::Done                  => None,
-            EscapeDefaultState::Unicode(ref mut iter) => None,
+            EscapeDefaultState::Backslash(c) => Some(0),
+            EscapeDefaultState::Char(c)      => Some(1),
+            EscapeDefaultState::Done         => None,
+            EscapeDefaultState::Unicode(_)   => None,
         }
     }
 }