Use pub_server package

pkg/pub_server/test/shelf_pubserver_test.dart

 // Copyright (c) 2015, 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 pubserver.shelf_pubserver_test;
+library pub_server.shelf_pubserver_test;
 
 import 'dart:async';
 import 'dart:convert';
 
 import 'package:shelf/shelf.dart' as shelf;
-import 'package:pubserver/repository.dart';
-import 'package:pubserver/shelf_pubserver.dart';
+import 'package:pub_server/repository.dart';
+import 'package:pub_server/shelf_pubserver.dart';
 import 'package:unittest/unittest.dart';
 
 class RepositoryMock implements PackageRepository {
   final Function downloadFun;
   final Function downloadUrlFun;
   final Function finishAsyncUploadFun;
   final Function lookupVersionFun;
   final Function startAsyncUploadFun;
   final Function uploadFun;
   final Function versionsFun;
@@ skipping 339 matching lines @@
         var mock = new RepositoryMock();
         var server = new ShelfPubServer(mock);
         var request =  new shelf.Request('GET', newUrl);
         var response = await server.requestHandler(request);
 
         expect(response.statusCode, equals(404));
       });
     });
   });
 }