Fix issues with protobuf equality comparisons

test/message_test.dart

 // Copyright (c) 2015, 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.
 
 /// Tests for GeneratedMessage methods.
 library message_test;
 
 import 'package:test/test.dart' show test, expect, predicate, throwsA;
 
-import 'mock_util.dart' show MockMessage;
+import 'mock_util.dart' show MockMessage, mockInfo;
 
 class Rec extends MockMessage {
-  get className => "Rec";
-  Rec create() => new Rec();
+  get info_ => _info;
+  static final _info = mockInfo("Rec", () => new Rec());
 }
 
-throwsError(Type expectedType, String expectedMessage) => throwsA(
-    predicate((x) {
-  expect(x.runtimeType, expectedType);
-  expect(x.message, expectedMessage);
-  return true;
-}));
+throwsError(Type expectedType, String expectedMessage) =>
+    throwsA(predicate((x) {
+      expect(x.runtimeType, expectedType);
+      expect(x.message, expectedMessage);
+      return true;
+    }));
 
 main() {
   test('getField with invalid tag throws exception', () {
     var r = new Rec();
     expect(() {
       r.getField(123);
     }, throwsError(ArgumentError, "tag 123 not defined in Rec"));
   });
 
   test('getDefaultForField with invalid tag throws exception', () {
     var r = new Rec();
     expect(() {
       r.getDefaultForField(123);
     }, throwsError(ArgumentError, "tag 123 not defined in Rec"));
   });
+
+  test('operator== and hashCode work for a simple record', () {
+    var a = new Rec();
+    expect(a == a, true);
+
+    var b = new Rec();
+    expect(a.info_ == b.info_, true, reason: "BuilderInfo should be the same");
+    expect(a == b, true);
+    expect(a.hashCode, b.hashCode);
+
+    a.val = 123;
+    expect(a == b, false);
+    b.val = 123;
+    expect(a == b, true);
+    expect(a.hashCode, b.hashCode);
+
+    a.child = new Rec();
+    expect(a == b, false);
+    b.child = new Rec();
+    expect(a == b, true);
+    expect(a.hashCode, b.hashCode);
+  });
 }