Use a mock SDK for most analysis server tests.

pkg/analysis_server/test/domain_analysis_test.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;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/computer/computer_highlights.dart';
 import 'package:analysis_server/src/analysis_server.dart';
@@ skipping 10 matching lines @@
   groupSep = ' | ';
 
   MockServerChannel serverChannel;
   AnalysisServer server;
   AnalysisDomainHandler handler;
   MemoryResourceProvider resourceProvider = new MemoryResourceProvider();
 
   setUp(() {
     serverChannel = new MockServerChannel();
     server = new AnalysisServer(serverChannel, resourceProvider);
+    server.defaultSdk = new MockSdk();
     handler = new AnalysisDomainHandler(server);
   });
 
   group('notification.errors', testNotificationErrors);
   group('notification.highlights', testNotificationHighlights);
   group('notification.navigation', testNotificationNavigation);
   group('updateContent', testUpdateContent);
   group('setSubscriptions', test_setSubscriptions);
 
   group('AnalysisDomainHandler', () {
@@ skipping 136 matching lines @@
   Map<String, List<Map<String, Object>>> filesHighlights = {};
   Map<String, List<Map<String, Object>>> filesNavigation = {};
 
   String testFile = '/project/bin/test.dart';
   String testCode;
 
   AnalysisTestHelper() {
     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) {
       if (notification.event == NOTIFICATION_ERRORS) {
         String file = notification.getParameter(FILE);
         List<Map<String, Object>> errorMaps = notification.getParameter(ERRORS);
         filesErrors[file] = errorMaps.map(jsonToAnalysisError).toList();
       }
       if (notification.event == NOTIFICATION_HIGHLIGHTS) {
@@ skipping 1435 matching lines @@
       // subscribe
       helper.addAnalysisSubscriptionHighlights(helper.testFile);
       // wait, has regions
       return helper.waitForOperationsFinished().then((_) {
         var highlights = helper.getHighlights(helper.testFile);
         expect(highlights, isNot(isEmpty));
       });
     });
   });
 }