Some fixes/improvements to getter/setter mocking.

pkg/unittest/test/mock_test.dart

 // Copyright (c) 2012, 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.
 
 library mock_test;
 import 'package:unittest/unittest.dart';
 import 'package:unittest/mock.dart';
 
 class MockList extends Mock implements List {
 }
@@ skipping 45 matching lines @@
     m.getLogs(callsTo('foo', 1, anything)).verify(happenedExactly(3));
     m.getLogs(callsTo('foo', 9, anything)).verify(happenedOnce);
     m.getLogs(callsTo('foo', anything, 2)).verify(happenedExactly(2));
     m.getLogs(callsTo('foobar')).verify(neverHappened);
     m.getLogs(callsTo('foo', 10, anything)).verify(neverHappened);
     m.getLogs(callsTo('foo'), returning(anyOf('A', 'C'))).
         verify(happenedExactly(2));
     expect(s, 'ACDEB');
   });
 
+  test('Mocking: getters/setters', () {
+    var m = new Mock();
+    var x = 0;
+    m.when(callsTo('get foo')).alwaysReturn(3);
+    m.when(callsTo('set foo')).alwaysCall((v) { x = v; });
+    m.when(callsTo('get bar')).alwaysReturn(5);
+    m.when(callsTo('set bar')).alwaysCall((v) { x = 2 * v; });
+    expect(m.foo, 3);
+    expect(m.bar, 5);
+    m.foo = 10;
+    expect(x, 10);
+    m.bar = 8;
+    expect(x, 16);
+  });
+
   test('Mocking: Mock List', () {
     var l = new MockList();
     l.when(callsTo('get length')).thenReturn(1);
     l.when(callsTo('add', anything)).alwaysReturn(0);
     l.add('foo');
     expect(l.length, 1);
 
     var m = new MockList();
     m.when(callsTo('add', anything)).alwaysReturn(0);
 
@@ skipping 552 matching lines @@
     expect(log.logs, hasLength(6));
     expect(log.logs.every((e) => e.mockName == 'm2' || e.mockName == 'm3'),
         isTrue);
     m2.clearLogs();
     expect(log.logs, hasLength(3));
     expect(log.logs.every((e) => e.mockName =='m3'), isTrue);
     m3.clearLogs();
     expect(log.logs, hasLength(0));
   });
 }