Extract constants into separate libarary.

pkg/analysis_server/test/analysis_server_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.analysis_server;
 
 import 'dart:async';
 
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analysis_server/src/analysis_server.dart';
+import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/domain_server.dart';
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/resource.dart';
 import 'package:mock/mock.dart';
 import 'package:unittest/unittest.dart';
 
 import 'mocks.dart';
 
 main() {
   group('AnalysisServer', () {
@@ skipping 175 matching lines @@
     MockAnalysisContext context = new MockAnalysisContext();
     server.addContextToWorkQueue(context);
     server.running = false;
     // Pump the event queue to make sure the server doesn't try to do any
     // analysis.
     return pumpEventQueue();
   }
 
   static Future shutdown() {
     server.handlers = [new ServerDomainHandler(server)];
-    var request = new Request('my28', ServerDomainHandler.SHUTDOWN_METHOD);
+    var request = new Request('my28', METHOD_SHUTDOWN);
     return channel.sendRequest(request)
         .then((Response response) {
           expect(response.id, equals('my28'));
           expect(response.error, isNull);
         });
   }
 
   static Future unknownRequest() {
     server.handlers = [new EchoHandler()];
     var request = new Request('my22', 'randomRequest');
@@ skipping 10 matching lines @@
   @override
   Response handleRequest(Request request) {
     if (request.method == 'echo') {
       var response = new Response(request.id);
       response.setResult('echo', true);
       return response;
     }
     return null;
   }
 }