Use different SDKs based on option settings

pkg/analysis_server/test/domain_execution_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.execution;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/analysis_server.dart';
@@ skipping 30 matching lines @@
       ExtensionManager manager = new ExtensionManager();
       ServerPlugin serverPlugin = new ServerPlugin();
       manager.processPlugins([serverPlugin]);
       server = new AnalysisServer(
           new MockServerChannel(),
           provider,
           new MockPackageMapProvider(),
           null,
           serverPlugin,
           new AnalysisServerOptions(),
-          new MockSdk(),
+          () => new MockSdk(),
           InstrumentationService.NULL_SERVICE);
       handler = new ExecutionDomainHandler(server);
     });
 
     group('createContext/deleteContext', () {
       test('create/delete multiple contexts', () {
         Request request =
             new ExecutionCreateContextParams('/a/b.dart').toRequest('0');
         Response response = handler.handleRequest(request);
         expect(response, isResponseSuccess('0'));
@@ skipping 55 matching lines @@
 
       tearDown(() {
         Request request =
             new ExecutionDeleteContextParams(contextId).toRequest('1');
         Response response = handler.handleRequest(request);
         expect(response, isResponseSuccess('1'));
       });
 
       group('file to URI', () {
         test('does not exist', () {
-          Request request = new ExecutionMapUriParams(contextId,
-              file: '/a/c.dart').toRequest('2');
+          Request request =
+              new ExecutionMapUriParams(contextId, file: '/a/c.dart')
+                  .toRequest('2');
           Response response = handler.handleRequest(request);
           expect(response, isResponseFailure('2'));
         });
 
         test('directory', () {
           provider.newFolder('/a/d');
           Request request =
               new ExecutionMapUriParams(contextId, file: '/a/d').toRequest('2');
           Response response = handler.handleRequest(request);
           expect(response, isResponseFailure('2'));
         });
       });
 
       group('URI to file', () {
         test('invalid', () {
-          Request request = new ExecutionMapUriParams(contextId,
-              uri: 'foo:///a/b.dart').toRequest('2');
+          Request request =
+              new ExecutionMapUriParams(contextId, uri: 'foo:///a/b.dart')
+                  .toRequest('2');
           Response response = handler.handleRequest(request);
           expect(response, isResponseFailure('2'));
         });
       });
 
       test('invalid context id', () {
         Request request =
             new ExecutionMapUriParams('xxx', uri: '').toRequest('4');
         Response response = handler.handleRequest(request);
         expect(response, isResponseFailure('4'));
@@ skipping 136 matching lines @@
   void test_mapUri_file() {
     String path = '/a/b.dart';
     resourceProvider.newFile(path, '');
     // map the file
     ExecutionMapUriResult result = _mapUri(file: path);
     expect(result.file, isNull);
     expect(result.uri, 'file:///a/b.dart');
   }
 
   void test_mapUri_file_dartUriKind() {
-    String path = server.defaultSdk.mapDartUri('dart:async').fullName;
+    String path = server.findSdk().mapDartUri('dart:async').fullName;
     // hack - pretend that the SDK file exists in the project FS
     resourceProvider.newFile(path, '// hack');
     // map file
     ExecutionMapUriResult result = _mapUri(file: path);
     expect(result.file, isNull);
     expect(result.uri, 'dart:async');
   }
 
   void test_mapUri_uri() {
     String path = '/a/b.dart';
@@ skipping 33 matching lines @@
  * A [Source] that knows it's [fullName].
  */
 class TestSource implements Source {
   String fullName;
 
   TestSource(this.fullName);
 
   @override
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }