Add numerous features to the Pub test infrastructure.

utils/pub/utils.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Generic utility functions. Stuff that should possibly be in core.
  */
 #library('utils');
 
 /** Thrown by methods that parse text when the text isn't a valid. */
@@ skipping 82 matching lines @@
   var buffer = new StringBuffer();
   var start = 0;
   for (var match in matcher.allMatches(source)) {
     buffer.add(source.substring(start, match.start()));
     start = match.end();
     buffer.add(fn(match));
   }
   buffer.add(source.substring(start));
   return buffer.toString();
 }
+
+/**
+ * Returns whether or not [str] ends with [matcher].
+ */
+bool endsWithPattern(String str, Pattern matcher) {
+  for (var match in matcher.allMatches(str)) {
+    if (match.end() == str.length) return true;
+  }
+  return false;
+}