Fix HTTP links in URI docs.

tests/utils/src/MarkdownTest.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// Unit tests for markdown.
 #library('markdown_tests');
 
 #import('../../../lib/dartdoc/markdown.dart');
 
 // TODO(rnystrom): Better path to unittest.
@@ skipping 689 matching lines @@
 
         [a]: http://foo.com
         ''', '''
         <p>links <a href="http://foo.com"><em>are</em></a> awesome</p>
         ''');
     validate('inline styles after a bad link are processed', '''
         [bad] `code`
         ''', '''
         <p>[bad] <code>code</code></p>
         ''');
+    validate('empty reference uses text from link', '''
+        links [are][] awesome
+
+        [are]: http://foo.com
+        ''', '''
+        <p>links <a href="http://foo.com">are</a> awesome</p>
+        ''');
+    validate('references are case-insensitive', '''
+        links [ARE][] awesome
+
+        [are]: http://foo.com
+        ''', '''
+        <p>links <a href="http://foo.com">ARE</a> awesome</p>
+        ''');
   });
 
   group('Inline links', () {
     validate('double quotes for title', '''
         links [are](http://foo.com "woo") awesome
         ''', '''
         <p>links <a href="http://foo.com" title="woo">are</a> awesome</p>
         ''');
     validate('no title', '''
         links [are] (http://foo.com) awesome
@@ skipping 77 matching lines @@
 
     // If one string runs out of non-ignored strings, the other must too.
     if (i == a.length) return j == b.length;
     if (j == b.length) return i == a.length;
 
     if (a[i] != b[j]) return false;
     i++;
     j++;
   }
 }