Verify the locale when initializing dates over http

pkg/intl/test/date_time_format_http_request_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // or details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Test date formatting and parsing using locale data read via an http request
  * to a server.
  */
 
 library date_time_format_http_request_test;
 
 import 'dart:html';
 import 'package:unittest/html_config.dart';
+import 'package:unittest/unittest.dart';
 import 'package:intl/date_symbol_data_http_request.dart';
 import 'date_time_format_test_stub.dart';
 
 main() {
   useHtmlConfiguration();
   var url = "http://localhost:${window.location.port}"
     "/root_dart/pkg/intl/lib/src/data/dates/";
 
+   test("Initializing a locale that needs fallback", () {
+     initializeDateFormatting("de_DE", url).then(expectAsync1((_) => true));
+   });
+
   runWith(smallSetOfLocales, url, initializeDateFormatting);
 }