fix #606, allow specifying the summary file extension

test/worker/worker_test.dart

 // Copyright (c) 2016, 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.
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
 import 'package:bazel_worker/bazel_worker.dart';
 // TODO(jakemac): Remove once this is a part of the testing library.
@@ skipping 83 matching lines @@
       expect((await futureProcessOutput).join(), isEmpty);
       expect(outputJsFile.existsSync(), isTrue);
     });
   });
 
   group('Hello World with Summaries', () {
     final greetingDart = new File('test/worker/greeting.dart').absolute;
     final helloDart = new File('test/worker/hello.dart').absolute;
 
     final greetingJS = new File('test/worker/greeting.js').absolute;
-    final greetingSummary = new File('test/worker/greeting.sum').absolute;
+    final greetingSummary = new File('test/worker/greeting.api.ds').absolute;
     final helloJS = new File('test/worker/hello_world.js').absolute;
 
     setUp(() {
       greetingDart.writeAsStringSync('String greeting = "hello";');
       helloDart.writeAsStringSync('import "greeting.dart";'
           'main() => print(greeting);');
     });
 
     tearDown(() {
       if (greetingDart.existsSync()) greetingDart.deleteSync();
       if (helloDart.existsSync()) helloDart.deleteSync();
       if (greetingJS.existsSync()) greetingJS.deleteSync();
       if (greetingSummary.existsSync()) greetingSummary.deleteSync();
       if (helloJS.existsSync()) helloJS.deleteSync();
     });
 
     test('can compile in basic mode', () {
       var result = Process.runSync('dart', [
         'bin/dartdevc.dart',
         'compile',
+        '--summary-extension=api.ds',
         '--no-source-map',
         '-o',
         greetingJS.path,
         greetingDart.path,
       ]);
       expect(result.exitCode, EXIT_CODE_OK);
       expect(result.stdout, isEmpty);
       expect(result.stderr, isEmpty);
       expect(greetingJS.existsSync(), isTrue);
       expect(greetingSummary.existsSync(), isTrue);
 
       result = Process.runSync('dart', [
         'bin/dartdevc.dart',
         'compile',
         '--no-source-map',
         '--no-summarize',
+        '--summary-extension=api.ds',
         '-s',
         greetingSummary.path,
         '-o',
         helloJS.path,
         helloDart.path,
       ]);
       expect(result.exitCode, EXIT_CODE_OK);
       expect(result.stdout, isEmpty);
       expect(result.stderr, isEmpty);
       expect(helloJS.existsSync(), isTrue);
@@ skipping 112 matching lines @@
 Future<WorkResponse> _readResponse(MessageGrouper messageGrouper) async {
   var buffer = (await messageGrouper.next) as List<int>;
   try {
     return new WorkResponse.fromBuffer(buffer);
   } catch (_) {
     var bufferAsString =
         buffer == null ? '' : 'String: ${UTF8.decode(buffer)}\n';
     throw 'Failed to parse response:\nbytes: $buffer\n$bufferAsString';
   }
 }