Report error if the same uri appears in multiple summaries.

pkg/dev_compiler/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 114 matching lines @@
   });
 
   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.api.ds').absolute;
     final helloJS = new File('test/worker/hello_world.js').absolute;
 
+    final greeting2JS = new File('test/worker/greeting2.js').absolute;
+    final greeting2Summary = new File('test/worker/greeting2.api.ds').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 (greeting2JS.existsSync()) greeting2JS.deleteSync();
+      if (greeting2Summary.existsSync()) greeting2Summary.deleteSync();
       if (helloJS.existsSync()) helloJS.deleteSync();
     });
 
     test('can compile in basic mode', () {
       final dartSdkSummary = new File('lib/sdk/ddc_sdk.sum').absolute;
       var result = Process.runSync(Platform.executable, [
         'bin/dartdevc.dart',
         '--summary-extension=api.ds',
         '--no-source-map',
         '--dart-sdk-summary',
@@ skipping 19 matching lines @@
         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);
     });
+
+    test('reports error on overlapping summaries', () {
+      final dartSdkSummary = new File('lib/sdk/ddc_sdk.sum').absolute;
+      var result = Process.runSync(Platform.executable, [
+        'bin/dartdevc.dart',
+        '--summary-extension=api.ds',
+        '--no-source-map',
+        '--dart-sdk-summary',
+        dartSdkSummary.path,
+        '-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(Platform.executable, [
+        'bin/dartdevc.dart',
+        '--summary-extension=api.ds',
+        '--no-source-map',
+        '--dart-sdk-summary',
+        dartSdkSummary.path,
+        '-o',
+        greeting2JS.path,
+        greetingDart.path,
+      ]);
+      expect(result.exitCode, EXIT_CODE_OK);
+      expect(result.stdout, isEmpty);
+      expect(result.stderr, isEmpty);
+      expect(greeting2JS.existsSync(), isTrue);
+      expect(greeting2Summary.existsSync(), isTrue);
+
+      result = Process.runSync(Platform.executable, [
+        'bin/dartdevc.dart',
+        '--no-source-map',
+        '--no-summarize',
+        '--dart-sdk-summary',
+        dartSdkSummary.path,
+        '--summary-extension=api.ds',
+        '-s',
+        greetingSummary.path,
+        '-s',
+        greeting2Summary.path,
+        '-o',
+        helloJS.path,
+        helloDart.path,
+      ]);
+      expect(result.exitCode, 65);
+      expect(result.stdout, contains("conflict"));
+      expect(result.stdout, contains(greetingDart.path));
+      expect(helloJS.existsSync(), isFalse);
+    });
   });
 
   group('Error handling', () {
     final dartSdkSummary = new File('lib/sdk/ddc_sdk.sum').absolute;
     final badFileDart = new File('test/worker/bad.dart').absolute;
     final badFileJs = new File('test/worker/bad.js').absolute;
 
     tearDown(() {
       if (badFileDart.existsSync()) badFileDart.deleteSync();
       if (badFileJs.existsSync()) badFileJs.deleteSync();
@@ skipping 106 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';
   }
 }