Add a test to verify that analysis server code generation is up to date.

pkg/analysis_server/tool/spec/codegen_inttest_methods.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.
 
 /**
  * Code generation for the file "integration_test_methods.dart".
  */
 library codegenInttestMethods;
 
 import 'dart:convert';
-import 'dart:io';
 
 import 'api.dart';
 import 'codegen_tools.dart';
 import 'from_html.dart';
 import 'to_html.dart';
 
 /**
  * Visitor that generates the code for integration_test_methods.dart
  */
 class CodegenInttestMethodsVisitor extends HierarchicalApiVisitor with
@@ skipping 71 matching lines @@
         });
         writeln('}');
       });
       writeln('}');
     });
     writeln('}');
   }
 
   @override
   visitNotification(Notification notification) {
-    String streamName = camelJoin(['on', notification.domainName, notification.event]);
+    String streamName = camelJoin(['on', notification.domainName,
+        notification.event]);
     writeln();
     docComment(toHtmlVisitor.collectHtml(() {
       toHtmlVisitor.translateHtml(notification.html);
       toHtmlVisitor.describePayload(notification.params, 'Parameters');
     }));
     writeln('Stream $streamName;');
     writeln();
     docComment(toHtmlVisitor.collectHtml(() {
       toHtmlVisitor.write('Stream controller for [$streamName].');
     }));
@@ skipping 118 matching lines @@
           return 'Map<String, dynamic>';
         default:
           throw new Exception(type.typeName);
       }
     } else {
       throw new Exception('Unexpected kind of TypeDecl');
     }
   }
 }
 
+final GeneratedFile target = new GeneratedFile(
+    '../../test/integration/integration_test_methods.dart', () {
+  CodegenInttestMethodsVisitor visitor = new CodegenInttestMethodsVisitor(
+      readApi());
+  return visitor.collectCode(visitor.visitApi);
+});
+
 /**
  * Translate spec_input.html into protocol_matchers.dart.
  */
 main() {
-  CodegenInttestMethodsVisitor visitor = new CodegenInttestMethodsVisitor(
-      readApi());
-  String code = visitor.collectCode(visitor.visitApi);
-  File outputFile = new File(
-      '../../test/integration/integration_test_methods.dart');
-  outputFile.writeAsStringSync(code);
+  target.generate();
 }