Add new VirtualHost class to http_server package, for handling multiple hosts on multiple sources (…

pkg/http_server/test/virtual_directory_test.dart

 // Copyright (c) 2013, 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.
 
 import 'dart:async';
 import 'dart:io';
 
 import "package:unittest/unittest.dart";
 import "package:http_server/http_server.dart";
 
-
-Future<int> getStatusCode(int port,
-                          String path,
-                          {DateTime ifModifiedSince}) {
-  return new HttpClient().get('localhost', port, path)
-      .then((request) {
-        if (ifModifiedSince != null) {
-          request.headers.ifModifiedSince = ifModifiedSince;
-        }
-        return request.close();
-      })
-      .then((response) => response.drain().then(
-          (_) => response.statusCode));
-}
-
-Future<HttpHeaders> getHeaders(int port, String path) {
-  return new HttpClient().get('localhost', port, path)
-      .then((request) => request.close())
-      .then((response) => response.drain().then(
-          (_) => response.headers));
-}
+import 'utils.dart';
 
 
 void main() {
   group('serve-root', () {
     test('dir-exists', () {
       expect(HttpServer.bind('localhost', 0).then((server) {
         var dir = new Directory('').createTempSync();
         var virDir = new VirtualDirectory(dir.path);
 
         virDir.serve(server);
@@ skipping 259 matching lines @@
               .whenComplete(() {
                 server.close();
                 dir.deleteSync(recursive: true);
               });
         }), completion(equals(HttpStatus.OK)));
       });
     });
   });
 }