Use a mock SDK for most analysis server tests.

pkg/analysis_server/test/analysis_abstract.dart

 // Copyright (c) 2014, 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 test.domain.analysis.abstract;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/domain_analysis.dart';
@@ skipping 26 matching lines @@
 //  Map<String, List<Map<String, Object>>> filesNavigation = {};
 
 
   AbstractAnalysisTest() {
   }
 
   void setUp() {
     serverChannel = new MockServerChannel();
     resourceProvider = new MemoryResourceProvider();
     server = new AnalysisServer(serverChannel, resourceProvider);
+    server.defaultSdk = new MockSdk();
     handler = new AnalysisDomainHandler(server);
     // listen for notifications
     Stream<Notification> notificationStream = serverChannel.notificationController.stream;
     notificationStream.listen((Notification notification) {
       processNotification(notification);
     });
     // create an empty project
     _createEmptyProject();
   }
 
@@ skipping 214 matching lines @@
     int c = search.codeUnitAt(length);
     if (!(c >= 'a'.codeUnitAt(0) && c <= 'z'.codeUnitAt(0) ||
           c >= 'A'.codeUnitAt(0) && c <= 'Z'.codeUnitAt(0) ||
           c >= '0'.codeUnitAt(0) && c <= '9'.codeUnitAt(0))) {
       break;
     }
     length++;
   }
   return length;
 }