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

pkg/analysis_server/tool/spec/codegen_java.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.
 
 /**
  * Tools for Java code generation.
  */
 library CodegenJava;
 
-import 'dart:io';
-
 import 'api.dart';
 import 'codegen_tools.dart';
+import 'from_html.dart';
 import 'to_html.dart';
 
 /**
  * Common code for all Java code generation.
  */
 class CodegenJavaVisitor extends HierarchicalApiVisitor with CodeGenerator {
   _CodegenJavaState _state;
 
   /**
    * Variable names which must be changed in order to avoid conflict with
@@ skipping 121 matching lines @@
    */
   Map<String, String> publicMethods = <String, String>{};
 
   /**
    * Temporary storage for private methods.
    */
   Map<String, String> privateMethods = <String, String>{};
 }
 
 /**
- * Use [visitor] to create Java code and output it to [path].
+ * Create a [GeneratedFile] that creates Java code and outputs it to [path].
+ * [path] uses Posix-style path separators regardless of the OS.
  */
-void createJavaCode(String path, CodegenJavaVisitor visitor) {
-  String code = visitor.collectCode(visitor.visitApi);
-  File outputFile = new File(path);
-  outputFile.writeAsStringSync(code);
+GeneratedFile javaGeneratedFile(String path, CodegenJavaVisitor createVisitor(Api api)) {
+  return new GeneratedFile(path, () {
+    CodegenJavaVisitor visitor = createVisitor(readApi());
+    return visitor.collectCode(visitor.visitApi);
+  });
 }