Async initialization for DateFormat

pkg/intl/test/intl_test.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.
 
 #library('intl_test');
 
 #import('../intl.dart');
 #import('../../../pkg/unittest/unittest.dart');
+#import('../date_symbol_data_local.dart');
 
 main() {
   test('Set locale', (){
-    var de = new Intl('de_DE');
-    expect(de.locale, equals('de'));
+    // TODO(alanknight): We need to make the locale verification be on a per
+    // usage basis rather than once for the entire Intl object. The set of
+    // locales covered for messages may be different from that for date
+    // formatting.
+    initializeDateFormatting('de_DE', null).then((_) {
+      var de = new Intl('de_DE');
+      expect(de.locale, equals('de'));});
   });
 }